1
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Yasuhara S, Nakagawa A, Okamoto K, Shiraishi T, Funakubo H, Yasui S, Itoh M, Tsurumi T, Hoshina T. Evaluation of ferroelectricity in a distorted wurtzite-type structure of Sc-doped LiGaO 2. RSC Adv 2024; 14:13900-13904. [PMID: 38699686 PMCID: PMC11064838 DOI: 10.1039/d4ra02296c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Accepted: 04/22/2024] [Indexed: 05/05/2024] Open
Abstract
Since the discovery of ferroelectricity in a wurtzite-type structure, this structural type has gathered much attention as a next-generation ferroelectric material due to its high polarization value combined with its high breakdown strength. However, the main targets of wurtzite-type ferroelectrics have been limited thus far to simple nitride/oxide compounds. The investigation of new ferroelectric materials with wurtzite-type structures is important for understanding ferroelectricity in such structures. We therefore focus on β-LiGaO2 in this study. Although AlN and ZnO possess well-known wurtzite-type structures (P63mc), β-LiGaO2 has a distorted wurtzite-type structure (Pna21), and there are no reports of ferroelectricity in LiGaO2. In this study, we have revealed that LiGaO2 exhibits relatively high barrier height energy for polarization switching, however, Sc doping effectively reduces that energy. Then, we conducted thin film preparation and evaluation for Sc-doped LiGaO2 to observe its ferroelectric properties. We successfully observed ferroelectric behavior by using piezoresponse force microscopy measurements for LiGa0.8Sc0.2O2/SrRuO3/(111)SrTiO3.
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Affiliation(s)
- Sou Yasuhara
- School of Materials and Chemical Technology, Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8550 Japan
| | - Ayato Nakagawa
- School of Materials and Chemical Technology, Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8550 Japan
| | - Kazuki Okamoto
- School of Materials and Chemical Technology, Tokyo Institute of Technology 4259 Nagatsuta, Midori-ku Yokohama Kanagawa 226-8501 Japan
| | - Takahisa Shiraishi
- School of Materials and Chemical Technology, Tokyo Institute of Technology 4259 Nagatsuta, Midori-ku Yokohama Kanagawa 226-8501 Japan
| | - Hiroshi Funakubo
- School of Materials and Chemical Technology, Tokyo Institute of Technology 4259 Nagatsuta, Midori-ku Yokohama Kanagawa 226-8501 Japan
| | - Shintaro Yasui
- Laboratory for Zero-Carbon Energy, Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8550 Japan
- Laboratory for Materials and Structures, Tokyo Institute of Technology 4259 Nagatsuta, Midori-ku Yokohama Kanagawa 226-8503 Japan
| | - Mitsuru Itoh
- Office of Campus Management, Tokyo Institute of Technology 4259 Nagatsuta, Midori-ku Yokohama Kanagawa 226-8501 Japan
| | - Takaaki Tsurumi
- School of Materials and Chemical Technology, Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8550 Japan
| | - Takuya Hoshina
- School of Materials and Chemical Technology, Tokyo Institute of Technology 2-12-1 Ookayama, Meguro-ku Tokyo 152-8550 Japan
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2
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Kawabata R, Li K, Araki T, Akiyama M, Sugimachi K, Matsuoka N, Takahashi N, Sakai D, Matsuzaki Y, Koshimizu R, Yamamoto M, Takai L, Odawara R, Abe T, Izumi S, Kurihira N, Uemura T, Kawano Y, Sekitani T. Ultraflexible Wireless Imager Integrated with Organic Circuits for Broadband Infrared Thermal Analysis. Adv Mater 2024; 36:e2309864. [PMID: 38213132 DOI: 10.1002/adma.202309864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 12/22/2023] [Indexed: 01/13/2024]
Abstract
Flexible imagers are currently under intensive development as versatile optical sensor arrays, designed to capture images of surfaces and internals, irrespective of their shape. A significant challenge in developing flexible imagers is extending their detection capabilities to encompass a broad spectrum of infrared light, particularly terahertz (THz) light at room temperature. This advancement is crucial for thermal and biochemical applications. In this study, a flexible infrared imager is designed using uncooled carbon nanotube (CNT) sensors and organic circuits. The CNT sensors, fabricated on ultrathin 2.4 µm substrates, demonstrate enhanced sensitivity across a wide infrared range, spanning from near-infrared to THz wavelengths. Moreover, they retain their characteristics under bending and crumpling. The design incorporates light-shielded organic transistors and circuits, functioning reliably under light irradiation, and amplifies THz detection signals by a factor of 10. The integration of both CNT sensors and shielded organic transistors into an 8 × 8 active-sensor matrix within the imager enables sequential infrared imaging and nondestructive assessment for heat sources and in-liquid chemicals through wireless communication systems. The proposed imager, offering unique functionality, shows promise for applications in biochemical analysis and soft robotics.
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Affiliation(s)
- Rei Kawabata
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1, Mihogaoka, Ibaraki-shi, Osaka, 567-0047, Japan
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Kou Li
- Department of Electrical, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Teppei Araki
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1, Mihogaoka, Ibaraki-shi, Osaka, 567-0047, Japan
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
- Advanced Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), 2-1 Yamada-Oka, Suita, Osaka, 565-0871, Japan
| | - Mihoko Akiyama
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1, Mihogaoka, Ibaraki-shi, Osaka, 567-0047, Japan
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Kaho Sugimachi
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1, Mihogaoka, Ibaraki-shi, Osaka, 567-0047, Japan
- Division of Applied Science, School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Nozomi Matsuoka
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1, Mihogaoka, Ibaraki-shi, Osaka, 567-0047, Japan
- Division of Applied Science, School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Norika Takahashi
- Department of Electrical, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Daiki Sakai
- Department of Electrical, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Yuto Matsuzaki
- Department of Electrical, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Ryo Koshimizu
- Department of Electrical, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Minami Yamamoto
- Department of Electrical, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Leo Takai
- Department of Electrical, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Ryoga Odawara
- Department of Electrical, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Takaaki Abe
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1, Mihogaoka, Ibaraki-shi, Osaka, 567-0047, Japan
| | - Shintaro Izumi
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1, Mihogaoka, Ibaraki-shi, Osaka, 567-0047, Japan
- Graduate School of Science, Technology and Innovation, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Hyogo, 657-8501, Japan
| | - Naoko Kurihira
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1, Mihogaoka, Ibaraki-shi, Osaka, 567-0047, Japan
| | - Takafumi Uemura
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1, Mihogaoka, Ibaraki-shi, Osaka, 567-0047, Japan
- Advanced Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), 2-1 Yamada-Oka, Suita, Osaka, 565-0871, Japan
| | - Yukio Kawano
- Department of Electrical, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
- National Institute of Informatics, 2-1-2 Hitotsubashi, Chiyoda-ku, Tokyo, 101-8430, Japan
| | - Tsuyoshi Sekitani
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1, Mihogaoka, Ibaraki-shi, Osaka, 567-0047, Japan
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
- Advanced Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), 2-1 Yamada-Oka, Suita, Osaka, 565-0871, Japan
- Division of Applied Science, School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan
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Aoki S, Dong Y, Wang Z, Huang XSW, Itahashi YM, Ogawa N, Ideue T, Iwasa Y. Giant Modulation of the Second Harmonic Generation by Magnetoelectricity in Two-Dimensional Multiferroic CuCrP 2S 6. Adv Mater 2024:e2312781. [PMID: 38533684 DOI: 10.1002/adma.202312781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 03/22/2024] [Indexed: 03/28/2024]
Abstract
Multiferroic materials have attracted considerable attention owing to their unique magnetoelectric or magnetooptical properties. The recent discovery of few-layer van der Waals multiferroic crystals provides a new research direction for controlling the multiferroic properties in the atomic layer limit. However, research on few-layer multiferroic crystals is limited and the effect of thickness-dependent symmetries on those properties is less explored. In this study, the symmetries and magnetoelectric responses of van der Waals multiferroic CuCrP2S6 are investigated by optical second harmonic generation (SHG). Structural and magnetic phase transitions are successfully probed by the temperature-dependent SHG signals, revealing significant changes by applying the magnetic field reflecting the magnetoelectric effect. Moreover, it is found that symmetries and resultant magnetoelectric responses can be modulated by the number of layers. These results offer a new principle of controlling the multiferroicity and indicate that 2D van der Waals multiferroic material is a promising building block for functional nanodevices.
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Affiliation(s)
- Shunta Aoki
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
| | - Yu Dong
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
| | - Ziqian Wang
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan
| | - Xiang S W Huang
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
| | - Yuki M Itahashi
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
| | - Naoki Ogawa
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan
| | - Toshiya Ideue
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
- The Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, 277-8581, Japan
| | - Yoshihiro Iwasa
- Department of Applied Physics, The University of Tokyo, Tokyo, 113-8656, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan
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4
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Ohno M, Fujita TC, Kawasaki M. Proximity effect of emergent field from spin ice in an oxide heterostructure. Sci Adv 2024; 10:eadk6308. [PMID: 38478617 PMCID: PMC10936949 DOI: 10.1126/sciadv.adk6308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 02/06/2024] [Indexed: 03/17/2024]
Abstract
Geometrical frustration endows magnets with degenerate ground states, resulting in exotic spin structures and quantum phenomena. Such magnets, called quantum magnets, can display non-coplanar spin textures and be a viable platform for the topological Hall effect driven by "emergent field." However, most quantum magnets are insulators, making it challenging to electrically detect associated fluctuations and excitations. Here, we probe magnetic transitions in the spin ice insulator Dy2Ti2O7, a prototypical quantum magnet, as emergent magnetotransport phenomena at the heterointerface with the nonmagnetic metal Bi2Rh2O7. Angle-dependent longitudinal resistivity exhibits peaks at the magnetic phase boundaries of spin ice due to domain boundary scattering. In addition, the anomalous Hall resistivity undergoes a sign change with the magnetic transition in Dy2Ti2O7, reflecting the inversion of the emergent field. These findings, on the basis of epitaxial techniques, connect the fundamental research on insulating quantum magnets to their potential electronic applications, possibly leading to transformative innovations in quantum technologies.
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Affiliation(s)
- Mizuki Ohno
- Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
| | - Takahiro C. Fujita
- Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
| | - Masashi Kawasaki
- Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
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5
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Furuya T, Shimoyama Y, Orita Y. Low temperature synthesis of ZnO particles using a CO 2-driven mechanism under high pressure. RSC Adv 2024; 14:5176-5183. [PMID: 38332793 PMCID: PMC10851106 DOI: 10.1039/d3ra07067k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Accepted: 02/02/2024] [Indexed: 02/10/2024] Open
Abstract
Low temperature synthesis of ZnO particles without using reactive materials, solvents and post-treatments is still a serious challenge for both fundamental research and industrial applications. In this research, we report the dry synthesis of ZnO particles only by using Zn(acac)2 and supercritical CO2 (scCO2) at the low temperature of 60 °C. The synthesis was performed using CO2 and N2 from 0.1 to 30.0 MPa for 18 h. As a result, ZnO yields increased with a rise in the CO2 pressure and reached 67% at 30.0 MPa while N2 medium gave low yields below 4.9% regardless of the pressure. Additionally, the detailed characterization results and the phase behavior observations evidentially showed the formation of zinc-CO/CO2-organic complexes in the solid phase of Zn(acac)2 powder under scCO2, resulting in the accelerated formation of ZnO particles. These findings suggest that scCO2 has potential value to drive the formation reaction of zinc-CO/CO2-organic complexes, which allows the low temperature synthesis of ZnO particles under dry conditions without using reactive materials, solvents and post-treatments.
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Affiliation(s)
- Taishi Furuya
- Department of Chemical Science and Engineering, Tokyo Institute of Technology 2-12-1 S1-33, Ookayama, Meguro-ku Tokyo 152-8550 Japan
| | - Yusuke Shimoyama
- Department of Chemical Science and Engineering, Tokyo Institute of Technology 2-12-1 S1-33, Ookayama, Meguro-ku Tokyo 152-8550 Japan
| | - Yasuhiko Orita
- Department of Chemical Science and Engineering, Tokyo Institute of Technology 2-12-1 S1-33, Ookayama, Meguro-ku Tokyo 152-8550 Japan
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6
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Toyota Y, Sagawa M, Yamashita S, Okayasu Y, Nagai Y, Okada Y, Kobayashi Y. Effect of the bulkiness of alkyl ligands on the excited-state dynamics of ZnO nanocrystals. RSC Adv 2024; 14:2796-2803. [PMID: 38234874 PMCID: PMC10792356 DOI: 10.1039/d3ra05166h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 01/10/2024] [Indexed: 01/19/2024] Open
Abstract
Organic ligands on the surface of nanocrystals (NCs) are extremely important in influencing various physical properties, such as dispersibility, electrical properties, and optical properties. Recent studies have revealed that a slight difference in the molecular structure of aliphatic organic ligands significantly affects the dispersibility of the NCs. On the other hand, the effects of the difference in the molecular structure of ligands on the excited-state dynamics of NCs remain elusive. In this study, we synthesized a series of colloidal ZnO NCs capped with different alkyl phosphonic acids and investigated their photophysical properties using emission decay measurements and transient absorption spectroscopy. The spectral shape and lifetime of the emission originating from the surface oxygen defects of ZnO NCs are almost the same irrespective of the alkyl phosphonic ligands used, indicating that the electronic states of the surface oxygen defects are not affected by the bulkiness of the ligand. On the other hand, the emission quantum yield correlates with the rate of carrier trapping by oxygen defects, suggesting that the rate of carrier trapping reflects the number of oxygen defects. Revealing the detailed relationship between molecular structures of organic ligands and the optical properties of NCs is important for advanced photofunctional superstructures using semiconductor NCs.
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Affiliation(s)
- Yuto Toyota
- Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University Kusatsu Shiga 525-8577 Japan +81-77-561-3915
| | - Masahiko Sagawa
- Department of Applied Biological Science, Tokyo University of Agriculture and Technology Tokyo 183-8509 Japan
| | - Shohei Yamashita
- Department of Applied Biological Science, Tokyo University of Agriculture and Technology Tokyo 183-8509 Japan
| | - Yoshinori Okayasu
- Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University Kusatsu Shiga 525-8577 Japan +81-77-561-3915
| | - Yuki Nagai
- Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University Kusatsu Shiga 525-8577 Japan +81-77-561-3915
| | - Yohei Okada
- Department of Applied Biological Science, Tokyo University of Agriculture and Technology Tokyo 183-8509 Japan
| | - Yoichi Kobayashi
- Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University Kusatsu Shiga 525-8577 Japan +81-77-561-3915
- Precursory Research for Embryonic Science and Technology (PRESTO), Science and Technology Agency (JST) 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan
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7
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Yamauchi A, Tanaka K, Fuki M, Fujiwara S, Kimizuka N, Ryu T, Saigo M, Onda K, Kusumoto R, Ueno N, Sato H, Kobori Y, Miyata K, Yanai N. Room-temperature quantum coherence of entangled multiexcitons in a metal-organic framework. Sci Adv 2024; 10:eadi3147. [PMID: 38170775 PMCID: PMC10775993 DOI: 10.1126/sciadv.adi3147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 11/28/2023] [Indexed: 01/05/2024]
Abstract
Singlet fission can generate an exchange-coupled quintet triplet pair state 5TT, which could lead to the realization of quantum computing and quantum sensing using entangled multiple qubits even at room temperature. However, the observation of the quantum coherence of 5TT has been limited to cryogenic temperatures, and the fundamental question is what kind of material design will enable its room-temperature quantum coherence. Here, we show that the quantum coherence of singlet fission-derived 5TT in a chromophore-integrated metal-organic framework can be over hundred nanoseconds at room temperature. The suppressed motion of the chromophores in ordered domains within the metal-organic framework leads to the enough fluctuation of the exchange interaction necessary for 5TT generation but, at the same time, does not cause severe 5TT decoherence. Furthermore, the phase and amplitude of quantum beating depend on the molecular motion, opening the way to room-temperature molecular quantum computing based on multiple quantum gate control.
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Affiliation(s)
- Akio Yamauchi
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kentaro Tanaka
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Masaaki Fuki
- Molecular Photoscience Research Center, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
- CREST, JST, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan
| | - Saiya Fujiwara
- RIKEN, RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan
| | - Nobuo Kimizuka
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Tomohiro Ryu
- Department of Chemistry, Graduate School of Science, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Masaki Saigo
- Department of Chemistry, Graduate School of Science, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Ken Onda
- Department of Chemistry, Graduate School of Science, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Ryota Kusumoto
- Department of Chemistry, Graduate School of Science, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
| | - Nami Ueno
- Graduate School of Human Development and Environment, Kobe University, 3-11 Tsurukabuto, Nada, Kobe 657-8501, Japan
| | - Harumi Sato
- Graduate School of Human Development and Environment, Kobe University, 3-11 Tsurukabuto, Nada, Kobe 657-8501, Japan
| | - Yasuhiro Kobori
- Molecular Photoscience Research Center, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
- CREST, JST, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan
- Department of Chemistry, Graduate School of Science, Kobe University, 1-1, Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
| | - Kiyoshi Miyata
- CREST, JST, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan
- Department of Chemistry, Graduate School of Science, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Nobuhiro Yanai
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- CREST, JST, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan
- Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- FOREST, JST, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan
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8
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Yamaguchi ST, Hatori S, Kotake KT, Zhou Z, Kume K, Reiter S, Norimoto H. Circadian control of sleep-related neuronal activity in lizards. PNAS Nexus 2024; 3:pgad481. [PMID: 38213615 PMCID: PMC10783807 DOI: 10.1093/pnasnexus/pgad481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Accepted: 12/18/2023] [Indexed: 01/13/2024]
Abstract
Although diurnal animals displaying monophasic sleep patterns exhibit periodic cycles of alternating slow-wave sleep (SWS) and rapid eye movement sleep (REMS), the regulatory mechanisms underlying these regular sleep cycles remain unclear. Here, we report that in the Australian dragon Pogona vitticeps exposed to constant darkness (DD), sleep behavior and sleep-related neuronal activity emerged over a 24-h cycle. However, the regularity of the REMS/SWS alternation was disrupted under these conditions. Notably, when the lizards were then exposed to 12 h of light after DD, the regularity of the sleep stages was restored. These results suggest that sleep-related neuronal activity in lizards is regulated by circadian rhythms and that the regularity of REMS and SWS cycling is influenced by daytime light exposure.
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Affiliation(s)
- Sho T Yamaguchi
- Department of Cellular Pharmacology, Graduate School of Medicine, Hokkaido University, Sapporo 060-8638, Japan
| | - Sena Hatori
- Department of Cellular Pharmacology, Graduate School of Medicine, Hokkaido University, Sapporo 060-8638, Japan
| | - Koki T Kotake
- Department of Cellular Pharmacology, Graduate School of Medicine, Hokkaido University, Sapporo 060-8638, Japan
| | - Zhiwen Zhou
- Department of Cellular Pharmacology, Graduate School of Medicine, Hokkaido University, Sapporo 060-8638, Japan
| | - Kazuhiko Kume
- Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya 467-8603, Japan
| | - Sam Reiter
- Computational Neuroethology Unit, Okinawa Institute of Science and Technology (OIST) Graduate University, Okinawa 904-0495, Japan
| | - Hiroaki Norimoto
- Department of Cellular Pharmacology, Graduate School of Medicine, Hokkaido University, Sapporo 060-8638, Japan
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9
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Inoue H, Zhou H, Ando H, Nakagawa S, Yamada T. Exploring the local solvation structure of redox molecules in a mixed solvent for increasing the Seebeck coefficient of thermocells. Chem Sci 2023; 15:146-153. [PMID: 38131095 PMCID: PMC10732003 DOI: 10.1039/d3sc04955h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 11/24/2023] [Indexed: 12/23/2023] Open
Abstract
A thermocell is an emerging alternative to thermoelectric devices and exhibits a high Seebeck coefficient (Se) due to the large change of solvation entropy associated with redox reactions. Here, the Se of p-chloranil radicals/dianions (CA˙-/2-) in acetonitrile was drastically increased from -1.3 to -2.6 mV K-1 by the addition of ethanol, and the increment surpassed the estimation of the classical Born model with continuum solvent media. UV-vis spectroscopy and electrochemical measurements at various mixing ratios of acetonitrile to ethanol revealed that the strong hydrogen bonding between ethanol and oxygen atoms of CA2- forms a 4 : 1 solvent-ion pair, while the ethanol molecules binding to CA2- dissociate upon its oxidation to CA˙-. The local solvation structures of CA2- are in good agreement with density functional theory. This order-disorder transition of the local solvation structure around the CA˙-/2- ions produces a large entropy change and results in a large Se value. The tailored solvation structure of redox ions by hydrogen bonding is a versatile method applicable to a variety of redox pairs and solvents, contributing to the development of electrolyte engineering for thermocells.
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Affiliation(s)
- Hirotaka Inoue
- Department of Chemistry, Graduate School of Science, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Hongyao Zhou
- Department of Chemistry, Graduate School of Science, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Hideo Ando
- Faculty of Science, Yamagata University 1-4-12 Kojirakawa-machi Yamagata 990-8560 Japan
| | - Sakuya Nakagawa
- Faculty of Science, Yamagata University 1-4-12 Kojirakawa-machi Yamagata 990-8560 Japan
| | - Teppei Yamada
- Department of Chemistry, Graduate School of Science, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
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10
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Kamba M, Shimizu R, Aikawa K. Nanoscale feedback control of six degrees of freedom of a near-sphere. Nat Commun 2023; 14:7943. [PMID: 38040746 PMCID: PMC10692201 DOI: 10.1038/s41467-023-43745-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Accepted: 11/17/2023] [Indexed: 12/03/2023] Open
Abstract
Manipulating the rotational as well as the translational degrees of freedom of rigid bodies has been a crucial ingredient in diverse areas, from optically controlled micro-robots, navigation, and precision measurements at macroscale to artificial and biological Brownian motors at nanoscale. Here, we demonstrate feedback cooling of all the angular motions of a near-spherical neutral nanoparticle with all the translational motions feedback-cooled to near the ground state. The occupation numbers of the three translational motions are 6 ± 1, 6 ± 1, and 0.69 ± 0.18. A tight, anisotropic optical confinement allows us to clearly observe three angular oscillations and to identify the ratio of two radii to the longest radius with a precision of 0.08 %. We develop a thermometry for three angular oscillations and realize feedback cooling of them to temperatures of lower than 0.03 K by electrically controlling the electric dipole moment of the nanoparticle.
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Affiliation(s)
- Mitsuyoshi Kamba
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, 152-8550, Tokyo, Japan
| | - Ryoga Shimizu
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, 152-8550, Tokyo, Japan
| | - Kiyotaka Aikawa
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, 152-8550, Tokyo, Japan.
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11
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Nakamura I, Amesaka H, Hara M, Yonezawa K, Okamoto K, Kamikubo H, Tanaka S, Matsuo T. Conformation state-specific monobodies regulate the functions of flexible proteins through conformation trapping. Protein Sci 2023; 32:e4813. [PMID: 37861467 PMCID: PMC10659937 DOI: 10.1002/pro.4813] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 10/06/2023] [Accepted: 10/17/2023] [Indexed: 10/21/2023]
Abstract
Synthetic binding proteins have emerged as modulators of protein functions through protein-protein interactions (PPIs). Because PPIs are influenced by the structural dynamics of targeted proteins, investigating whether the synthetic-binders-based strategy is applicable for proteins with large conformational changes is important. This study demonstrates the applicability of monobodies (fibronectin type-III domain-based synthetic binding proteins) in regulating the functions of proteins that undergo tens-of-angstroms-scale conformational changes, using an example of the A55C/C77S/V169C triple mutant (Adktm ; a phosphoryl transfer-catalyzing enzyme with a conformational change between OPEN/CLOSED forms). Phage display successfully developed monobodies that recognize the OPEN form (substrate-unbound form), but not the CLOSED form of Adktm . Two OPEN form-specific clones (OP-2 and OP-4) inhibited Adktm kinase activity. Epitope mapping with a yeast-surface display/flow cytometry indicated that OP-2 binds to the substrate-entry side of Adktm , whereas OP-4 binding occurs at another site. Small angle X-ray scattering coupled with size-exclusion chromatography (SEC-SAXS) indicated that OP-4 binds to the hinge side opposite to the substrate-binding site of Adktm , retaining the whole OPEN-form structure of Adktm . Titration of the OP-4-Adktm complex with Ap5 A, a transition-state analog of Adktm , showed that the conformational shift to the CLOSED form was suppressed although Adktm retained the OPEN-form (i.e., substrate-binding ready form). These results show that OP-4 captures and stabilizes the OPEN-form state, thereby affecting the hinge motion. These experimental results indicate that monobody-based modulators can regulate the functions of proteins that show tens-of-angstroms-scale conformational changes, by trapping specific conformational states generated during large conformational change process that is essential for function exertion.
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Affiliation(s)
- Ibuki Nakamura
- Division of Materials Science, Graduate School of Science and TechnologyNara Institute of Science and Technology (NAIST)NaraJapan
| | - Hiroshi Amesaka
- Graduate School of Life and Environmental SciencesKyoto Prefectural UniversityKyotoJapan
| | - Mizuho Hara
- Graduate School of Life and Environmental SciencesKyoto Prefectural UniversityKyotoJapan
| | - Kento Yonezawa
- Division of Materials Science, Graduate School of Science and TechnologyNara Institute of Science and Technology (NAIST)NaraJapan
- Center for Digital Green‐innovationNara Institute of Science and Technology (NAIST)NaraJapan
| | - Keisuke Okamoto
- Graduate School of Life and Environmental SciencesKyoto Prefectural UniversityKyotoJapan
| | - Hironari Kamikubo
- Division of Materials Science, Graduate School of Science and TechnologyNara Institute of Science and Technology (NAIST)NaraJapan
- Center for Digital Green‐innovationNara Institute of Science and Technology (NAIST)NaraJapan
| | - Shun‐ichi Tanaka
- Graduate School of Life and Environmental SciencesKyoto Prefectural UniversityKyotoJapan
- Department of Biotechnology, College of Life SciencesRitsumeikan UniversityKusatsuJapan
| | - Takashi Matsuo
- Division of Materials Science, Graduate School of Science and TechnologyNara Institute of Science and Technology (NAIST)NaraJapan
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12
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Jin Z, Sasaki N, Kishida N, Takeuchi M, Wakayama Y, Sugiyasu K. Two-Dimensional Living Supramolecular Polymerization: Improvement in Edge Roughness of Supramolecular Nanosheets by Using a Dummy Monomer. Chemistry 2023; 29:e202302181. [PMID: 37658627 DOI: 10.1002/chem.202302181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 08/24/2023] [Accepted: 08/28/2023] [Indexed: 09/03/2023]
Abstract
Supramolecular polymers are formed through nucleation (i. e., initiation) and polymerization processes, and kinetic control over the nucleation process has recently led to the realization of living supramolecular polymerization. Changing the viewpoint, herein we focus on controlling the polymerization process, which we expect to pave the way to further developments in controlled supramolecular polymerization. In our previous study, two-dimensional living supramolecular polymerization was used to produce supramolecular nanosheets with a controlled area; however, these had rough edges. In this study, the growth of the nanosheets was controlled by using a 'dummy' monomer to produce supramolecular nanosheets with smoothed edges.
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Grants
- JP19K05592 Ministry of Education, Culture, Sports, Science and Technology
- JP22H02134 Ministry of Education, Culture, Sports, Science and Technology
- 20H04682 Ministry of Education, Culture, Sports, Science and Technology
- JP20H05868 Ministry of Education, Culture, Sports, Science and Technology
- JPMXP1122714694 Ministry of Education, Culture, Sports, Science and Technology
- Izumi Science and Technology Foundation
- Iketani Science and Technology Foundation
- Murata Science Foundation
- Sekisui Chemical
- Mitsubishi Foundation
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Affiliation(s)
- Zhehui Jin
- Department of Chemistry and Biochemistry Graduate School of Engineering, Kyushu University, Nishi-ku, Fukuoka, 819-0395, Japan
- National Institute for Materials Science, Tsukuba, Ibaraki, 305-0047, Japan
| | - Norihiko Sasaki
- National Institute for Materials Science, Tsukuba, Ibaraki, 305-0047, Japan
| | - Natsuki Kishida
- Laboratory for Chemistry and Life Science Institute of Innovative Research, Tokyo Institute of Technology 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503, Japan
| | - Masayuki Takeuchi
- National Institute for Materials Science, Tsukuba, Ibaraki, 305-0047, Japan
| | - Yutaka Wakayama
- Department of Chemistry and Biochemistry Graduate School of Engineering, Kyushu University, Nishi-ku, Fukuoka, 819-0395, Japan
- National Institute for Materials Science, Tsukuba, Ibaraki, 305-0047, Japan
| | - Kazunori Sugiyasu
- Department of Polymer Chemistry, Kyoto University Kyotodaigaku-katsura, Kyoto, 615-8510, Japan
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13
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Bian Z, Nakano Y, Miyata K, Oya I, Nobuoka M, Tsutsui Y, Seki S, Suda M. Chiral Van Der Waals Superlattices for Enhanced Spin-Selective Transport and Spin-Dependent Electrocatalytic Performance. Adv Mater 2023; 35:e2306061. [PMID: 37695880 DOI: 10.1002/adma.202306061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 08/30/2023] [Indexed: 09/13/2023]
Abstract
The emergence of the chiral-induced spin-selectivity (CISS) effect offers a new avenue for chiral organic molecules to autonomously manipulate spin configurations, thereby opening up possibilities in spintronics and spin-dependent electrochemical applications. Despite extensive exploration of various chiral systems as spin filters, one often encounters challenges in achieving simultaneously high conductivity and high spin polarization (SP). In this study, a promising chiral van der Waals superlattice, specifically the chiral TiS2 crystal, is synthesized via electrochemical intercalation of chiral molecules into a metallic TiS2 single crystal. Multiple tunneling processes within the highly ordered chiral layered structure of chiral TiS2 superlattices result in an exceptionally high SP exceeding 90%. This remarkable observation of significantly high SP within the linear transport regime is unprecedented. Furthermore, the chiral TiS2 electrode exhibits enhanced catalytic activity for oxygen evolution reaction (OER) due to its remarkable spin-selectivity for triplet oxygen evolution. The OER performance of chiral TiS2 superlattice crystals presented here exhibits superior characteristics to previously reported chiral MoS2 catalysts, with an approximately tenfold increase in current density. The combination of metallic conductivity and high SP sets the stage for the development of a new generation of CISS materials, enabling a wide range of electron spin-based applications.
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Affiliation(s)
- Zhiyun Bian
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Yuki Nakano
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Keisuke Miyata
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Ichiro Oya
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Masaki Nobuoka
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Yusuke Tsutsui
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
- JST-PRESTO, Honcho 4-1-8, Kawaguchi, Saitama, 332-0012, Japan
| | - Shu Seki
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Masayuki Suda
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
- JST-PRESTO, Honcho 4-1-8, Kawaguchi, Saitama, 332-0012, Japan
- JST-FOREST, Honcho 4-1-8, Kawaguchi, Saitama, 332-0012, Japan
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14
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Sakamoto K, Hamachi T, Miyokawa K, Tateishi K, Uesaka T, Kurashige Y, Yanai N. Polarizing agents beyond pentacene for efficient triplet dynamic nuclear polarization in glass matrices. Proc Natl Acad Sci U S A 2023; 120:e2307926120. [PMID: 37871226 PMCID: PMC10622900 DOI: 10.1073/pnas.2307926120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Accepted: 09/08/2023] [Indexed: 10/25/2023] Open
Abstract
Triplet dynamic nuclear polarization (triplet-DNP) is a technique that can obtain high nuclear polarization under moderate conditions. However, in order to obtain practically useful polarization, large single crystals doped with a polarizing agent must be strictly oriented with respect to the magnetic field to sharpen the electron spin resonance (ESR) spectra, which is a fatal problem that prevents its application to truly useful biomolecular targets. Instead of this conventional physical approach of controlling crystal orientation, here, we propose a chemical approach, i.e., molecular design of polarizing agents; pentacene molecules, the most typical triplet-DNP polarizing agent, are modified so as to make the triplet electron distribution wider and more isotropic without loss of the triplet polarization. The thiophene-modified pentacene exhibits a sharper and stronger ESR spectrum than the parent pentacene, and state-of-the-art quantum chemical calculations revealed that the direction of the spin polarization is altered by the modification with thiophene moieties and the size of D and E parameters are reduced from parent pentacene due to the partial delocalization of spin densities on the thiophene moieties. The triplet-DNP with the new polarizing agent successfully exceeds the previous highest 1H polarization of glassy materials by a factor of 5. This demonstrates the feasibility of a polarizing agent that can surpass pentacene, the best polarizing agent for more than 30 y since triplet-DNP was first reported, in the unoriented state. This work provides a pathway toward practically useful high nuclear polarization of various biomolecules by triplet-DNP.
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Affiliation(s)
- Keita Sakamoto
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, Fukuoka819-0395, Japan
| | - Tomoyuki Hamachi
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, Fukuoka819-0395, Japan
| | - Katsuki Miyokawa
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto606-8502, Japan
| | - Kenichiro Tateishi
- Cluster for Pioneering Research, RIKEN, RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama351-0198, Japan
| | - Tomohiro Uesaka
- Cluster for Pioneering Research, RIKEN, RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama351-0198, Japan
| | - Yuki Kurashige
- Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto606-8502, Japan
- Japan Science and Technology Agency-Fusion Oriented REsearch for disruptive Science and Technology, Kawaguchi, Saitama332-0012, Japan
| | - Nobuhiro Yanai
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, Fukuoka819-0395, Japan
- Japan Science and Technology Agency-Fusion Oriented REsearch for disruptive Science and Technology, Kawaguchi, Saitama332-0012, Japan
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15
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Anh LD, Kobayashi M, Takeda T, Araki K, Okano R, Sumi T, Horio M, Yamamoto K, Kubota Y, Owada S, Yabashi M, Matsuda I, Tanaka M. Ultrafast Subpicosecond Magnetization of a 2D Ferromagnet. Adv Mater 2023; 35:e2301347. [PMID: 37309900 DOI: 10.1002/adma.202301347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 05/12/2023] [Indexed: 06/14/2023]
Abstract
Strong spin-charge interactions in several ferromagnets are expected to lead to subpicosecond (sub-ps) magnetization of the magnetic materials through control of the carrier characteristics via electrical means, which is essential for ultrafast spin-based electronic devices. Thus far, ultrafast control of magnetization has been realized by optically pumping a large number of carriers into the d or f orbitals of a ferromagnet; however, it is extremely challenging to implement by electrical gating. This work demonstrates a new method for sub-ps magnetization manipulation called wavefunction engineering, in which only the spatial distribution (wavefunction) of s (or p) electrons is controlled and no change is required in the total carrier density. Using a ferromagnetic semiconductor (FMS) (In,Fe)As quantum well (QW), instant enhancement, as fast as 600 fs, of the magnetization is observed upon irradiating a femtosecond (fs) laser pulse. Theoretical analysis shows that the instant enhancement of the magnetization is induced when the 2D electron wavefunctions (WFs) in the FMS QW are rapidly moved by a photo-Dember electric field formed by an asymmetric distribution of the photocarriers. Because this WF engineering method can be equivalently implemented by applying a gate electric field, these results open a new way to realize ultrafast magnetic storage and spin-based information processing in present electronic systems.
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Affiliation(s)
- Le Duc Anh
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
- PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Saitama, Kawaguchi, 332-0012, Japan
- Center for Spintronics Research Network (CSRN), The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Masaki Kobayashi
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
- Center for Spintronics Research Network (CSRN), The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Takahito Takeda
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Kohsei Araki
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Ryo Okano
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Toshihide Sumi
- Institute of Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba, 277-8581, Japan
| | - Masafumi Horio
- Institute of Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba, 277-8581, Japan
| | - Kohei Yamamoto
- Institute for Molecular Science, Okazaki, Aichi, 444-8585, Japan
| | - Yuya Kubota
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
| | - Shigeki Owada
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo, 679-5198, Japan
| | - Makina Yabashi
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo, 679-5148, Japan
- Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo, 679-5198, Japan
| | - Iwao Matsuda
- Institute of Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba, 277-8581, Japan
| | - Masaaki Tanaka
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
- Center for Spintronics Research Network (CSRN), The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
- Institute for Nano Quantum Information Electronics (NanoQuine), The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-0041, Japan
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16
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Naito H, Makino Y, Zhang W, Ogawa T, Endo T, Sannomiya T, Kaneda M, Hashimoto K, Lim HE, Nakanishi Y, Watanabe K, Taniguchi T, Matsuda K, Miyata Y. High-throughput dry transfer and excitonic properties of twisted bilayers based on CVD-grown transition metal dichalcogenides. Nanoscale Adv 2023; 5:5115-5121. [PMID: 37705802 PMCID: PMC10496764 DOI: 10.1039/d3na00371j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 08/21/2023] [Indexed: 09/15/2023]
Abstract
van der Waals (vdW) layered materials have attracted much attention because their physical properties can be controlled by varying the twist angle and layer composition. However, such twisted vdW assemblies are often prepared using mechanically exfoliated monolayer flakes with unintended shapes through a time-consuming search for such materials. Here, we report the rapid and dry fabrication of twisted multilayers using chemical vapor deposition (CVD) grown transition metal chalcogenide (TMDC) monolayers. By improving the adhesion of an acrylic resin stamp to the monolayers, the single crystals of various TMDC monolayers with desired grain size and density on a SiO2/Si substrate can be efficiently picked up. The present dry transfer process demonstrates the one-step fabrication of more than 100 twisted bilayers and the sequential stacking of a twisted 10-layer MoS2 single crystal. Furthermore, we also fabricated hBN-encapsulated TMDC monolayers and various twisted bilayers including MoSe2/MoS2, MoSe2/WSe2, and MoSe2/WS2. The interlayer interaction and quality of dry-transferred, CVD-grown TMDCs were characterized by using photoluminescence (PL), cathodoluminescence (CL) spectroscopy, and cross-sectional electron microscopy. The prominent PL peaks of interlayer excitons can be observed for MoSe2/MoS2 and MoSe2/WSe2 with small twist angles at room temperature. We also found that the optical spectra were locally modulated due to nanosized bubbles, which are formed by the presence of interface carbon impurities. The present findings indicate the widely applicable potential of the present method and enable an efficient search of the emergent optical and electrical properties of TMDC-based vdW heterostructures.
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Affiliation(s)
- Hibiki Naito
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Yasuyuki Makino
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Wenjin Zhang
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Tomoya Ogawa
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Takahiko Endo
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Takumi Sannomiya
- Department of Materials Science and Engineering, Tokyo Institute of Technology Yokohama 226-8503 Japan
| | - Masahiko Kaneda
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Kazuki Hashimoto
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Hong En Lim
- Department of Chemistry, Saitama University Saitama 338-8570 Japan
| | - Yusuke Nakanishi
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
| | - Kenji Watanabe
- Research Center for Electronic and Optical Materials, NIMS Tsukuba 305-0044 Japan
| | - Takashi Taniguchi
- Research Center for Materials Nanoarchitectonics, NIMS Tsukuba 305-0044 Japan
| | - Kazunari Matsuda
- Institute of Advanced Energy, Kyoto University Kyoto 611-0011 Japan
| | - Yasumitsu Miyata
- Department of Physics, Tokyo Metropolitan University Hachioji 192-0397 Japan
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17
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Zhou H, Matoba F, Matsuno R, Wakayama Y, Yamada T. Direct Conversion of Phase-Transition Entropy into Electrochemical Thermopower and the Peltier Effect. Adv Mater 2023; 35:e2303341. [PMID: 37315308 DOI: 10.1002/adma.202303341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 06/05/2023] [Indexed: 06/16/2023]
Abstract
A thermocell generates thermopower from a temperature difference (ΔT) between two electrodes. The converse process of thermocells is an electrochemical Peltier effect, which creates a ΔT on the electrodes by applying an external current. The Seebeck coefficient (Se ) of the electrochemical system is proportional to the entropy change of the redox reaction; therefore, a redox system having a significant entropy change is expected to increase the Se . In this study, a thermoresponsive polymer having a redox-active moiety, poly(N-isopropyl acrylamide-co-N-(2-acrylamide ethyl)-N'-n-propylviologen) (PNV), is used as the redox species of a thermocell. PNV2+ dication undergoes the coil-globule phase transition upon the reduction to PNV+ cation radical, and a large entropy change is introduced because water molecules are freed from the polymer chains. The Se of PNV thermocell drastically increased to +2.1 mV K-1 at the lower critical solution temperature (LCST) of PNV. The entropy change calculated from the increment of Se agrees with the value evaluated by differential scanning calorimetry. Moreover, the electrochemical Peltier effect is observed when the device temperature is increased above the LCST. This study shows that the large entropy change associated with the coil-globule phase transition can be used in electrochemical thermal management and refrigeration technologies.
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Affiliation(s)
- Hongyao Zhou
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Fumitoshi Matoba
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo, 113-0033, Japan
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - Ryohei Matsuno
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Yusuke Wakayama
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Teppei Yamada
- Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo, 113-0033, Japan
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18
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Hatakeyama G, Zhou H, Kikuchi T, Nishio M, Oka K, Sadakiyo M, Nishiyama Y, Yamada T. Design of a robust and strong-acid MOF platform for selective ammonium recovery and proton conductivity. Chem Sci 2023; 14:9068-9073. [PMID: 37655037 PMCID: PMC10466313 DOI: 10.1039/d3sc02743k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 07/31/2023] [Indexed: 09/02/2023] Open
Abstract
Metal-organic frameworks (MOFs) are potential candidates for the platform of the solid acid; however, no MOF has been reported that has both aqueous ammonium stability and a strong acid site. This manuscript reports a highly stable MOF with a cation exchange site synthesized by the reaction between zirconium and mellitic acid under a high concentration of ammonium cations (NH4+). Single-crystal XRD analysis of the MOF revealed the presence of four free carboxyl groups of the mellitic acid ligand, and the high first association constant (pKa1) of one of the carboxyl groups acts as a monovalent ion-exchanging site. NH4+ in the MOF can be reversibly exchanged with proton (H+), sodium (Na+), and potassium (K+) cations in an aqueous solution. Moreover, the uniform nanospace of the MOF provides the acid site for selective NH4+ recovery from the aqueous mixture of NH4+ and Na+, which could solve the global nitrogen cycle problem. The solid acid nature of the MOF also results in the proton conductivity reaching 1.34 × 10-3 S cm-1 at 55 °C by ion exchange from NH4+ to H+.
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Affiliation(s)
- Genki Hatakeyama
- Division of Chemistry, Graduate School of Science, The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Hongyao Zhou
- Division of Chemistry, Graduate School of Science, The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Takashi Kikuchi
- Rigaku Corporation 3-9-12 Matsubaracho Akishima Tokyo 196-8666 Japan
| | - Masaki Nishio
- Division of Chemistry, Graduate School of Science, The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Kouki Oka
- Division of Chemistry, Graduate School of Science, The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
| | - Masaaki Sadakiyo
- Department of Applied Chemistry, Faculty of Science Division I, Tokyo University of Science 1-3 Kagurazaka Shinjuku-ku Tokyo 162-8601 Japan
| | - Yusuke Nishiyama
- Nano-Crystallography Unit, RIKEN-JEOL Collaboration Center, RIKEN Yokohama Kanagawa 230-0045 Japan
- JEOL RESONANCE Inc. Akishima Tokyo 196-8558 Japan
| | - Teppei Yamada
- Division of Chemistry, Graduate School of Science, The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan
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19
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Tajiri M, Imai S, Konuma T, Shimamoto K, Shimada I, Akashi S. Evaluation of Drug Responses to Human β 2AR Using Native Mass Spectrometry. ACS Omega 2023; 8:24544-24551. [PMID: 37457453 PMCID: PMC10339329 DOI: 10.1021/acsomega.3c02737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 06/13/2023] [Indexed: 07/18/2023]
Abstract
We aimed to develop a platform to rapidly investigate the responses of agonists and antagonists to G-protein-coupled receptors (GPCRs) using native mass spectrometry (MS). We successfully observed the ligand-bound human β2 adrenergic receptor (hβ2AR); however, it was challenging to quantitatively discuss drug efficacy from MS data alone. Since ligand-bound GPCRs are stabilized by the Gα subunit of G proteins on the membrane, mini-Gs and nanobody80 (Nb80) that can mimic the Gα interface of the GPCR were utilized. Ternary complexes of hβ2AR, ligand, and mini-Gs or Nb80 were prepared and subjected to native MS. We found a strong correlation between the hβ2AR-mini-Gs or -Nb80 complex ratio observed in the mass spectra and agonist/antagonist efficacy obtained using a cell-based assay. This method does not require radioisotope labeling and would be applicable to the analysis of other GPCRs, facilitating the characterization of candidate compounds as GPCR agonists and antagonists.
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Affiliation(s)
- Michiko Tajiri
- Graduate
School of Medical Life Science, Yokohama
City University, 1-7-29 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Shunsuke Imai
- Biosystems
Dynamics Research, RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Tsuyoshi Konuma
- Graduate
School of Medical Life Science, Yokohama
City University, 1-7-29 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Keiko Shimamoto
- Suntory
Foundation for Life Sciences, 8-1-1 Seikadai, Seika-cho, Soraku-gun, Kyoto 619-0284, Japan
| | - Ichio Shimada
- Biosystems
Dynamics Research, RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
- Graduate
School of Integrated Sciences for Life, Hiroshima University, 1-4-4 Kagamiyama, Higashi, Hiroshima City, Hiroshima 739-8528, Japan
| | - Satoko Akashi
- Graduate
School of Medical Life Science, Yokohama
City University, 1-7-29 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
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20
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Matsuura H, Takano K, Shirakashi R. Slow water dynamics in dehydrated human Jurkat T cells evaluated by dielectric spectroscopy with the Bruggeman-Hanai equation. RSC Adv 2023; 13:20934-20940. [PMID: 37441032 PMCID: PMC10334875 DOI: 10.1039/d3ra02892e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 07/05/2023] [Indexed: 07/15/2023] Open
Abstract
The picosecond orientational dynamics of intracellular water was measured by dielectric spectroscopy, with the aim of revealing the effects of cryoprotective agents (CPAs) on biological cells. As a first step, Jurkat cells (human T lymphocyte cells) suspended in aqueous sucrose solutions of different concentrations ranging from 0.3 M (isotonic) to 0.9 M (hypertonic) were examined at 25 °C with a frequency range up to 43.5 GHz. The Bruggeman-Hanai equation was employed to obtain a cellular dielectric spectrum without extracellular contributions from the measured complex permittivity of the cell suspensions. By analyzing the γ process around 1010 Hz based on the Debye relaxation function, two types of water (bulk-like water and hydration water with slower molecular dynamics) were observed. An increase in the fraction of intracellular slower water was observed in the dehydrated cells which had a highly concentrated environment of biomolecules.
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Affiliation(s)
- Hiroaki Matsuura
- Institute of Industrial Science, The University of Tokyo Meguro Tokyo 153-8505 Japan
- Research Fellow of the Japan Society for the Promotion of Science Chiyoda Tokyo 102-0083 Japan
| | - Kiyoshi Takano
- Institute of Industrial Science, The University of Tokyo Meguro Tokyo 153-8505 Japan
| | - Ryo Shirakashi
- Institute of Industrial Science, The University of Tokyo Meguro Tokyo 153-8505 Japan
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21
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Araki T, Li K, Suzuki D, Abe T, Kawabata R, Uemura T, Izumi S, Tsuruta S, Terasaki N, Kawano Y, Sekitani T. Broadband Photodetectors and Imagers in Stretchable Electronics Packaging. Adv Mater 2023:e2304048. [PMID: 37403808 DOI: 10.1002/adma.202304048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Revised: 06/22/2023] [Accepted: 07/03/2023] [Indexed: 07/06/2023]
Abstract
The integration of flexible electronics with optics can help realize a powerful tool that facilitates the creation of a smart society wherein internal evaluations can be easily performed nondestructively from the surface of various objects that is used or encountered in daily lives. Here, organic-material-based stretchable optical sensors and imagers that possess both bending capability and rubber-like elasticity are reviewed. The latest trends in nondestructive evaluation equipment that enable simple on-site evaluations of health conditions and abnormalities are discussed without subjecting the targeted living bodies and various objects to mechanical stress. Real-time performance under real-life conditions is becoming increasingly important for creating smart societies interwoven with optical technologies. In particular, the terahertz (THz)-wave region offers a substance- and state-specific fingerprint spectrum that enables instantaneous analyses. However, to make THz sensors accessible, the following issues must be addressed: broadband and high-sensitivity at room temperature, stretchability to follow the surface movements of targets, and digital transformation compatibility. The materials, electronics packaging, and remote imaging systems used to overcome these issues are discussed in detail. Ultimately, stretchable optical sensors and imagers with highly sensitive and broadband THz sensors can facilitate the multifaceted on-site evaluation of solids, liquids, and gases.
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Affiliation(s)
- Teppei Araki
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki-shi, 567-0047, Osaka, Japan
- Advanced Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), 2-1 Yamada-Oka, Suita, 565-0871, Osaka, Japan
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, 565-0871, Osaka, Japan
| | - Kou Li
- Department of Electrical, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, 112-8551, Tokyo, Japan
| | - Daichi Suzuki
- Sensing System Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 807-1, Shuku-machi, Tosu, 841-0052, Saga, Japan
| | - Takaaki Abe
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki-shi, 567-0047, Osaka, Japan
| | - Rei Kawabata
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki-shi, 567-0047, Osaka, Japan
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, 565-0871, Osaka, Japan
| | - Takafumi Uemura
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki-shi, 567-0047, Osaka, Japan
- Advanced Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), 2-1 Yamada-Oka, Suita, 565-0871, Osaka, Japan
| | - Shintaro Izumi
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki-shi, 567-0047, Osaka, Japan
- Graduate School of Science, Technology and Innovation, Kobe University, 1-1 Rokkodai-cho, Nada-ku, 657-8501, Kobe, Japan
| | - Shuichi Tsuruta
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki-shi, 567-0047, Osaka, Japan
| | - Nao Terasaki
- Sensing System Research Center, National Institute of Advanced Industrial Science and Technology (AIST), 807-1, Shuku-machi, Tosu, 841-0052, Saga, Japan
| | - Yukio Kawano
- Department of Electrical, Electronic, and Communication Engineering, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, 112-8551, Tokyo, Japan
- National Institute of Informatics, Tokyo, 101-8430, Japan
| | - Tsuyoshi Sekitani
- SANKEN (The Institute of Scientific and Industrial Research), Osaka University, 8-1 Mihogaoka, Ibaraki-shi, 567-0047, Osaka, Japan
- Advanced Photonics and Biosensing Open Innovation Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), 2-1 Yamada-Oka, Suita, 565-0871, Osaka, Japan
- Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, 565-0871, Osaka, Japan
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22
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Pimta K, Autthawong T, Yodying W, Phromma C, Haruta M, Kurata H, Sarakonsri T, Chimupala Y. Development of Bronze Phase Titanium Dioxide Nanorods for Use as Fast-Charging Anode Materials in Lithium-Ion Batteries. ACS Omega 2023; 8:15360-15370. [PMID: 37151525 PMCID: PMC10157655 DOI: 10.1021/acsomega.3c00618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 04/11/2023] [Indexed: 05/09/2023]
Abstract
Bronze phase titanium dioxide (TiO2(B)) nanorods were successfully prepared via a hydrothermal method together with an ion exchange process and calcination by using anatase titanium dioxide precursors in the alkali hydrothermal system. TiO2 precursors promoted the elongation of nanorod morphology. The different hydrothermal temperatures and reaction times demonstrated that the synthesis parameters had a significant influence on phase formation and physical morphologies during the fabrication process. The effects of the synthesis conditions on the tailoring of the crystal morphology were discussed. The growth direction of the TiO2(B) nanorods was investigated by X-ray diffractometry (XRD) and scanning electron microscopy (SEM). The as-synthesized TiO2(B) nanorods obtained after calcination were used as anode materials and tested the efficiency of Li-ion batteries. This research will study the effects of particle morphologies and crystallinity of TiO2(B) derived from a modified hydrothermal method on the capacity and charging rate of the Li-ion battery. The TiO2(B) nanorods, which were synthesized by using a hydrothermal temperature of 220 °C for 12 h, presented excellent electrochemical performance with the highest Li storage capacity (348.8 mAh/g for 100 cycles at a current density of 100 mA/g) and excellent high-rate cycling capability (a specific capacity of 207.3 mAh/g for 1000 cycles at a rate of 5000 mA/g).
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Affiliation(s)
- Korawith Pimta
- Department
of Industrial Chemistry, Faculty of Science, Chiang Mai University, Chiang
Mai 50200, Thailand
- Center
of Excellence in Materials Science and Technology, Chiang Mai University, Chiang
Mai 50200, Thailand
- Graduate
School, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Thanapat Autthawong
- Department
of Chemistry, Faculty of Science, Chiang
Mai University, Chiang Mai 50200, Thailand
- Center
of Excellence in Materials Science and Technology, Chiang Mai University, Chiang
Mai 50200, Thailand
| | - Waewwow Yodying
- Department
of Chemistry, Faculty of Science, Chiang
Mai University, Chiang Mai 50200, Thailand
| | - Chitsanupong Phromma
- Department
of Industrial Chemistry, Faculty of Science, Chiang Mai University, Chiang
Mai 50200, Thailand
| | - Mitsutaka Haruta
- Institute
for Chemical Research, Kyoto University, Uji 611-0011, Kyoto, Japan
| | - Hiroki Kurata
- Institute
for Chemical Research, Kyoto University, Uji 611-0011, Kyoto, Japan
| | - Thapanee Sarakonsri
- Department
of Chemistry, Faculty of Science, Chiang
Mai University, Chiang Mai 50200, Thailand
- Center
of Excellence in Materials Science and Technology, Chiang Mai University, Chiang
Mai 50200, Thailand
| | - Yothin Chimupala
- Department
of Industrial Chemistry, Faculty of Science, Chiang Mai University, Chiang
Mai 50200, Thailand
- Center
of Excellence in Materials Science and Technology, Chiang Mai University, Chiang
Mai 50200, Thailand
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23
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Takahashi Y, Takamatsu D, Korchev Y, Fukuma T. Correlative Analysis of Ion-Concentration Profile and Surface Nanoscale Topography Changes Using Operando Scanning Ion Conductance Microscopy. JACS Au 2023; 3:1089-1099. [PMID: 37124299 PMCID: PMC10131198 DOI: 10.1021/jacsau.2c00677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 02/16/2023] [Accepted: 02/17/2023] [Indexed: 05/03/2023]
Abstract
Although various spectroscopic methods have been developed to capture ion-concentration profile changes, it is still difficult to visualize the ion-concentration profile and surface topographical changes simultaneously during the charging/discharging of lithium-ion batteries (LIBs). To tackle this issue, we have developed an operando scanning ion conductance microscopy (SICM) method that can directly visualize an ion-concentration profile and surface topography using a SICM nanopipette while controlling the sample potential or current with a potentiostat for characterizing the polarization state during charging/discharging. Using operando SICM on the negative electrode (anode) of LIBs, we have characterized ion-concentration profile changes and the reversible volume changes related to the phase transition during cyclic voltammetry (CV) and charge/discharge of the graphite anode. Operando SICM is a versatile technique that is likely to be of major value for evaluating the correlation between the electrolyte concentration profile and nanoscale surface topography changes.
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Affiliation(s)
- Yasufumi Takahashi
- Department
of Electronics, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
- WPI
Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kanazawa 920-1192, Japan
| | - Daiko Takamatsu
- Center
for Exploratory Research, Research &
Development Group, Hitachi, Ltd., Hatoyama-machi, Saitama 350-0395, Japan
| | - Yuri Korchev
- WPI
Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kanazawa 920-1192, Japan
- Department
of Medicine, Imperial College London, London W12 0NN, United Kingdom
| | - Takeshi Fukuma
- WPI
Nano Life Science Institute (WPI-NanoLSI), Kanazawa University, Kanazawa 920-1192, Japan
- Division
of Electrical Engineering and Computer Science, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
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24
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Yao Y, Watanabe H, Hara M, Nagano S, Nagao Y. Lyotropic Liquid Crystalline Property and Organized Structure in High Proton-Conductive Sulfonated Semialicyclic Oligoimide Thin Films. ACS Omega 2023; 8:7470-7478. [PMID: 36872982 PMCID: PMC9979332 DOI: 10.1021/acsomega.2c06398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 01/18/2023] [Indexed: 06/18/2023]
Abstract
Fully aromatic sulfonated polyimides with a rigid backbone can form lamellar structures under humidified conditions, thereby facilitating the transmission of protons in ionomers. Herein, we synthesized a new sulfonated semialicyclic oligoimide composed of 1,2,3,4-cyclopentanetetracarboxylic dianhydride (CPDA) and 3,3'-bis-(sulfopropoxy)-4,4'-diaminobiphenyl to investigate the influence of molecular organized structure and proton conductivity with lower molecular weight. The weight-average molecular weight (M w) determined by gel permeation chromatography was 9300. Humidity-controlled grazing incidence X-ray scattering revealed that one scattering was observed in the out-of-plane direction and showed that the scattering position shifted to a lower angle as the humidity increased. A loosely packed lamellar structure was formed by lyotropic liquid crystalline properties. Although the ch-pack aggregation of the present oligomer was reduced by substitution to the semialicyclic CPDA from the aromatic backbone, the formation of a distinct organized structure in the oligomeric form was observed because of the linear conformational backbone. This report is the first-time observation of the lamellar structure in such a low-molecular-weight oligoimide thin film. The thin film exhibited a high conductivity of 0.2 (±0.01) S cm-1 under 298 K and 95% relative humidity, which is the highest value compared to the other reported sulfonated polyimide thin films with comparable molecular weight.
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Affiliation(s)
- Yuze Yao
- School
of Materials Science, Japan Advanced Institute
of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
| | - Hayato Watanabe
- Graduate
School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Mitsuo Hara
- Graduate
School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
| | - Shusaku Nagano
- Department
of Chemistry, College of Science, Rikkyo
University, 3-34-1 Nishi-ikebukuro, Toshima, Tokyo 171-8501, Japan
| | - Yuki Nagao
- School
of Materials Science, Japan Advanced Institute
of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa 923-1292, Japan
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25
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Suzuki D, Nonoguchi Y, Shimamoto K, Terasaki N. Outstanding Robust Photo- and Thermo-Electric Applications with Stabilized n-Doped Carbon Nanotubes by Parylene Coating. ACS Appl Mater Interfaces 2023; 15:9873-9882. [PMID: 36781167 PMCID: PMC9951210 DOI: 10.1021/acsami.2c21347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Accepted: 01/20/2023] [Indexed: 06/18/2023]
Abstract
Stabilization techniques for n-doped carbon nanotubes (CNTs) are essential for the practical use of CNT devices. However, none of the reported n-dopants have sufficient robustness in a practical environment. Herein, we report a highly stable technique for fabricating n-doped CNT films. We elucidate the mechanism by which air stability can be achieved by completely covering CNTs with n-dopants to prevent oxidation; consequently, the stability is lost when exposed to scratches or moisture. Therefore, we introduce parylene as a protective layer for n-doped CNTs and achieve air stability for more than 365 d. Moreover, we demonstrate outstanding robust thermo-electric power generation from strong acids, alkalis, and alcohols, which cannot be realized with conventional air-stable n-dopants. The proposed stabilization technique is versatile and can be applied to various n-dopants. Thus, it is expected to be a key technology in the practical application of CNT devices.
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Affiliation(s)
- Daichi Suzuki
- Sensing
System Research Center, National Institute
of Advanced Industrial Science and Technology (AIST), Saga 841-0052, Japan
| | - Yoshiyuki Nonoguchi
- Faculty
of Materials Science and Engineering, Kyoto
Institute of Technology, Kyoto 606-8585, Japan
| | - Kazumasa Shimamoto
- Nanomaterials
Research Institute, National Institute of
Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
| | - Nao Terasaki
- Sensing
System Research Center, National Institute
of Advanced Industrial Science and Technology (AIST), Saga 841-0052, Japan
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26
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Goel S, Khang NHD, Osada Y, Anh LD, Hai PN, Tanaka M. Room-temperature spin injection from a ferromagnetic semiconductor. Sci Rep 2023; 13:2181. [PMID: 36750728 PMCID: PMC9905071 DOI: 10.1038/s41598-023-29169-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 01/31/2023] [Indexed: 02/09/2023] Open
Abstract
Spin injection using ferromagnetic semiconductors at room temperature is a building block for the realization of spin-functional semiconductor devices. Nevertheless, this has been very challenging due to the lack of reliable room-temperature ferromagnetism in well-known group IV and III-V based semiconductors. Here, we demonstrate room-temperature spin injection by using spin pumping in a BiSb/(Ga,Fe)Sb heterostructure, where (Ga,Fe)Sb is a ferromagnetic semiconductor (FMS) with high Curie temperature (TC) and BiSb is a topological insulator (TI). Despite the very small magnetization of (Ga,Fe)Sb at room temperature (45 emu/cc), we detected spin injection from (Ga,Fe)Sb by utilizing the large inverse spin Hall effect (ISHE) in BiSb. Our study provides the first demonstration of spin injection at room temperature from a FMS.
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Affiliation(s)
- Shobhit Goel
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
- CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan.
| | - Nguyen Huynh Duy Khang
- Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
- Department of Physics, Ho Chi Minh City University of Education, 280 An Duong Vuong Street, District 5, Ho Chi Minh City, 738242, Vietnam
| | - Yuki Osada
- Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Le Duc Anh
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
- Institute of Engineering Innovation, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
- PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan
- Center for Spintronics Research Network (CSRN), The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Pham Nam Hai
- CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan.
- Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan.
- Center for Spintronics Research Network (CSRN), The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
| | - Masaaki Tanaka
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
- CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan.
- Center for Spintronics Research Network (CSRN), The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
- Institute for Nano Quantum Information Electronics, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan.
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27
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Nemoto K, Watanabe J, Yamada H, Sun HT, Shirahata N. Impact of coherent core/shell architecture on fast response in InP-based quantum dot photodiodes. Nanoscale Adv 2023; 5:907-915. [PMID: 36756505 PMCID: PMC9890971 DOI: 10.1039/d2na00734g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 12/18/2022] [Indexed: 06/18/2023]
Abstract
Solution-processed, cadmium-free quantum dot (QD) photodiodes are compatible with printable optoelectronics and are regarded as a potential candidate for wavelength-selective optical sensing. However, a slow response time resulting from low carrier mobility and a poor dissociation of charge carriers in the optically active layer has hampered the development of the QD photodiodes with nontoxic device constituents. Herein, we report the first InP-based photodiode with a multilayer device architecture, working in photovoltaic mode in photodiode circuits. The photodiode showed the fastest response speed with rising and falling times of τ r = 4 ms and τ f = 9 ms at a voltage bias of 0 V at room temperature in ambient air among the Cd-free photodiodes. The single-digit millisecond photo responses were realized by efficient transportation of the photogenerated carriers in the optically active layer resulting from coherent InP/ZnS core/shell QD structure, fast separation of electron and hole pairs at the interface between QD and Al-doped ZnO layers, and optimized conditions for uniform deposition of each thin film. The results suggested the versatility of coherent core/shell QDs as a photosensitive layer, whose structures allow various semiconductor combinations without lattice mismatch considerations, towards fast response, high on/off ratios, and spectrally tunable optical sensing.
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Affiliation(s)
- Kazuhiro Nemoto
- Graduate School of Chemical Sciences and Engineering, Hokkaido University Sapporo 060-0814 Japan
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) 1-1 Namiki Tsukuba 305-0044 Japan
| | - Junpei Watanabe
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) 1-1 Namiki Tsukuba 305-0044 Japan
- Department of Physics, Chuo University 1-13-27 Kasuga Bunkyo Tokyo 112-8551 Japan
| | - Hiroyuki Yamada
- Graduate School of Chemical Sciences and Engineering, Hokkaido University Sapporo 060-0814 Japan
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) 1-1 Namiki Tsukuba 305-0044 Japan
| | - Hong-Tao Sun
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) 1-1 Namiki Tsukuba 305-0044 Japan
| | - Naoto Shirahata
- Graduate School of Chemical Sciences and Engineering, Hokkaido University Sapporo 060-0814 Japan
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) 1-1 Namiki Tsukuba 305-0044 Japan
- Department of Physics, Chuo University 1-13-27 Kasuga Bunkyo Tokyo 112-8551 Japan
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Akita I, Ishida Y, Yonezawa T. Mixed-Metal-Atom Markers Enable Simultaneous Imaging of Spatial Distribution in Two-Dimensional Heterogeneous Molecular Assembly by Scanning Transmission Electron Microscopy. ACS Meas Sci Au 2022; 2:542-546. [PMID: 36785777 PMCID: PMC9885999 DOI: 10.1021/acsmeasuresciau.2c00043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 07/28/2022] [Accepted: 08/01/2022] [Indexed: 06/18/2023]
Abstract
Atomic-scale observation by aberration-corrected scanning transmission electron microscopy (STEM) is essential for characterizing supramolecular assemblies with nonperiodic structures. Identifying the relative spatial arrangement in a mixture of molecular species in an assembly is crucial for understanding chemical reaction systems occurring in the assembly. Herein, we report the first direct observation of supramolecular assemblies comprising anionic clay mineral nanosheets and two types of cationic porphyrin complexes with Pt and Pd atom markers by annular dark-field STEM, enabling the simultaneous imaging of well-mixed spatial molecular distributions. The results expand the possibility of applying electron microscopy to self-assembly structures constructed via weak supramolecular interactions on relatively thick nanosheet materials and on one- to few-atom-thick graphene analogues, which will provide important guidelines for future material design.
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Yokouchi T, Sugimoto S, Rana B, Seki S, Ogawa N, Shiomi Y, Kasai S, Otani Y. Pattern recognition with neuromorphic computing using magnetic field-induced dynamics of skyrmions. Sci Adv 2022; 8:eabq5652. [PMID: 36179033 PMCID: PMC9524829 DOI: 10.1126/sciadv.abq5652] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Accepted: 08/15/2022] [Indexed: 06/12/2023]
Abstract
Nonlinear phenomena in physical systems can be used for brain-inspired computing with low energy consumption. Response from the dynamics of a topological spin structure called skyrmion is one of the candidates for such a neuromorphic computing. However, its ability has not been well explored experimentally. Here, we experimentally demonstrate neuromorphic computing using nonlinear response originating from magnetic field-induced dynamics of skyrmions. We designed a simple-structured skyrmion-based neuromorphic device and succeeded in handwritten digit recognition with the accuracy as large as 94.7% and waveform recognition. Notably, there exists a positive correlation between the recognition accuracy and the number of skyrmions in the devices. The large degrees of freedom of skyrmion systems, such as the position and the size, originate from the more complex nonlinear mapping, the larger output dimension, and, thus, high accuracy. Our results provide a guideline for developing energy-saving and high-performance skyrmion neuromorphic computing devices.
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Affiliation(s)
- Tomoyuki Yokouchi
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- Department of Basic Science, The University of Tokyo, Tokyo 152-8902, Japan
| | - Satoshi Sugimoto
- National Institute for Materials Science (NIMS), Tsukuba 305-0047, Japan
| | - Bivas Rana
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- Institute of Spintronics and Quantum Information, Faculty of Physics, Adam Mickiewicz University, Poznań, Uniwersytetu Poznanskiego 2, Poznań 61-614, Poland
| | - Shinichiro Seki
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- PRESTO, Japan Science and Technology Agency (JST), Tokyo 102-0075, Japan
- Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
- Institute of Engineering Innovation, The University of Tokyo, Tokyo 113-8656, Japan
| | - Naoki Ogawa
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- PRESTO, Japan Science and Technology Agency (JST), Tokyo 102-0075, Japan
- Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan
| | - Yuki Shiomi
- Department of Basic Science, The University of Tokyo, Tokyo 152-8902, Japan
| | - Shinya Kasai
- National Institute for Materials Science (NIMS), Tsukuba 305-0047, Japan
- PRESTO, Japan Science and Technology Agency (JST), Tokyo 102-0075, Japan
| | - Yoshichika Otani
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa 277-8561, Japan
- Trans-scale Quantum Science Institute, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
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30
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Huang X, Matsushita Y, Sun HT, Shirahata N. Impact of bismuth-doping on enhanced radiative recombination in lead-free double-perovskite nanocrystals. Nanoscale Adv 2022; 4:3091-3100. [PMID: 36133518 PMCID: PMC9419852 DOI: 10.1039/d2na00238h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Accepted: 06/10/2022] [Indexed: 06/16/2023]
Abstract
Lead-free double-perovskite nanocrystals (NCs) have received considerable attention as promising candidates for environmentally friendly optical applications. Furthermore, double-perovskite nanostructures are known to be physically stable compared to most other inorganic halide perovskites, with a generic chemical formula of ABX3 (e.g., A = Cs+; B = Sn2+ or Ge2+; X = Cl-, Br-, I-, or their combination). However, relevant experimental studies on the photophysical properties are still insufficient for Pb-free double-perovskite NCs. Herein, we synthesized Cs2Ag0.65Na0.35InCl6 NCs doped with bismuth (Bi3+) ions and investigated their photophysical properties to reveal the role of the dopant on the enhanced photoemission properties. Specifically, it was found that the photoluminescence quantum yield (PLQY) increased up to 33.2% by 2% Bi-doping. The optical bandgap of the NCs decreased from 3.47 eV to 3.41 eV as the amount of the dopant increased from 2% to 15%. To find out the effect of Bi-doping, the temperature-dependent PL properties of the undoped and doped NCs were investigated by utilizing steady-state and time-resolved PL spectroscopy. With increasing the temperature from 20 K to 300 K, the PL intensities of the doped NCs decreased slower than the undoped ones. The correlated average PL lifetimes of both the bismuth-doped and undoped NCs decreased with increasing the temperature. The experimental results revealed that all the NC samples showed thermal quenching with the temperature increasing, and the PL quenching was suppressed in bismuth-doped NCs.
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Affiliation(s)
- Xiaoyu Huang
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) Ibaraki 305-0044 Japan
- Graduate School of Chemical Sciences and Engineering, Hokkaido University Sapporo 060-0814 Japan
| | - Yoshitaka Matsushita
- Research Network and Facility Services Division, National Institute for Materials Science (NIMS) Ibaraki 305-0047 Japan
| | - Hong-Tao Sun
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) Ibaraki 305-0044 Japan
| | - Naoto Shirahata
- International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS) Ibaraki 305-0044 Japan
- Graduate School of Chemical Sciences and Engineering, Hokkaido University Sapporo 060-0814 Japan
- Department of Physics, Chuo University Tokyo 112-8551 Japan
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Abstract
OBJECTIVES While the development of vaccines against the Novel Coronavirus (COVID-19) brought hope of establishing herd immunity and ending the global pandemic, vaccine hesitancy can hinder the progress towards herd immunity. In this study, by analysing the data collected when citizens undergo public health restrictions due to the pandemic, we assess the determinants of vaccine hesitancy, reasons for hesitation and potential effectiveness of vaccine passports used to relax public health restrictions on mitigating vaccine hesitancy. DESIGN Cross-sectional study, longitudinal study and conjoint experimental design. SETTING An online survey conducted in Japan in July 2021. PARTICIPANTS A demographically representative sample of 5000 Japanese adults aged 20-74. PRIMARY OUTCOME MEASURES COVID-19 vaccination intention RESULTS: We found that about 30% of respondents did not intend to get vaccinated or had not yet decided, with major reasons for vaccine hesitancy relating to concerns about the safety and side effects of the vaccine. In line with previous findings, younger age, lower socioeconomic status, and psychological and behavioural factors such as weaker COVID-19 fear were associated with vaccine hesitancy. Easing of public health restrictions such as travel, wearing face masks and dining out at night was associated with an increase in vaccine acceptance by 4%-10%. Moreover, we found that more than 90% of respondents who intended to get vaccinated actually received it while smaller proportions among those undecided and unwilling to get vaccinated did so. CONCLUSION With a major concern about vaccine safety and side effects, interventions to mitigate against these may help to reduce vaccine hesitancy. Moreover, when citizens are imposed with restrictions, vaccine passports that increase their freedom may be helpful to increase vaccination rates.
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Affiliation(s)
- Shohei Okamoto
- Research Team for Social Participation and Community Health, Tokyo Metropolitan Institute of Gerontology, Itabashi-ku, Tokyo, Japan
- Institute for Global Health Policy Research, National Center for Global Health and Medicine, Shinjuku-ku, Tokyo, Japan
- Research Center for Financial Gerontology, Keio University, Minato-ku, Tokyo, Japan
| | - Kazuki Kamimura
- Research Center for Financial Gerontology, Keio University, Minato-ku, Tokyo, Japan
- Hirao School of Management, Konan University, Nishinomiya, Hyogo, Japan
| | - Kohei Komamura
- Research Center for Financial Gerontology, Keio University, Minato-ku, Tokyo, Japan
- Faculty of Economics, Keio University, Minato-ku, Tokyo, Japan
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32
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Nazar M, Shah MUH, Ahmad A, Yahya WZN, Goto M, Moniruzzaman M. Ionic Liquid and Tween-80 Mixture as an Effective Dispersant for Oil Spills: Toxicity, Biodegradability, and Optimization. ACS Omega 2022; 7:15751-15759. [PMID: 35571843 PMCID: PMC9096972 DOI: 10.1021/acsomega.2c00752] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Accepted: 03/29/2022] [Indexed: 05/07/2023]
Abstract
Chemical dispersants are used extensively for oil spill remediation. Most of these dispersants are composed of a mixture of surfactants and organic solvents, which raises concerns about aquatic toxicity and environmental impact. In this study, the toxicity and biodegradability of an oil spill dispersant composed of the surface-active ionic liquid 1-butyl-3-methylimidazolium lauroyl sarcosinate [Bmim][Lausar] and Tween-80 were investigated. In addition, important environmental factors including salinity, temperature, and wave-mixing energy were optimized to obtain maximum dispersion effectiveness. The acute toxicity against zebrafish (Danio rerio) showed that the developed dispersant was practically non-toxic with a median lethal dose of more than 100 mg L-1 after 96 h. The dispersant also demonstrated outstanding biodegradability of 66% after 28 days. A model was developed using a response surface methodology that efficiently (R 2 = 0.992) related the salinity, temperature, and wave-mixing energy of seawater to dispersion effectiveness. The system was then optimized, and a high dispersion effectiveness of 89.70% was obtained with an experimental error of less than 2%. Our findings suggest that the surface-active ionic liquid and Tween-80 mixture could be a viable alternative to toxic chemical dispersants for oil spill remediation.
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Affiliation(s)
- Masooma Nazar
- Department
of Chemical Engineering, Universiti Teknologi
PETRONAS, Bandar
Seri Iskandar, 32610 Perak, Malaysia
| | - Mansoor Ul Hassan Shah
- Department
of Chemical Engineering, University of Engineering
and Technology, 25120 Peshawar, Pakistan
| | - Aqeel Ahmad
- Department
of Chemical Engineering, Universiti Teknologi
PETRONAS, Bandar
Seri Iskandar, 32610 Perak, Malaysia
| | - Wan Zaireen Nisa Yahya
- Department
of Chemical Engineering, Universiti Teknologi
PETRONAS, Bandar
Seri Iskandar, 32610 Perak, Malaysia
- Center
of Research in Ionic Liquids (CORIL), Universiti
Teknologi PETRONAS, Bandar Seri
Iskandar, 32610 Perak, Malaysia
| | - Masahiro Goto
- Department
of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744,
Moto-oka, 819-0395 Fukuoka, Japan
| | - Muhammad Moniruzzaman
- Department
of Chemical Engineering, Universiti Teknologi
PETRONAS, Bandar
Seri Iskandar, 32610 Perak, Malaysia
- Center
of Research in Ionic Liquids (CORIL), Universiti
Teknologi PETRONAS, Bandar Seri
Iskandar, 32610 Perak, Malaysia
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33
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Ino K, Pai HJ, Hiramoto K, Utagawa Y, Nashimoto Y, Shiku H. Electrochemical Imaging of Endothelial Permeability Using a Large-Scale Integration-Based Device. ACS Omega 2021; 6:35476-35483. [PMID: 34984279 PMCID: PMC8717544 DOI: 10.1021/acsomega.1c04931] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 11/19/2021] [Indexed: 06/14/2023]
Abstract
It is important to clarify the transport of biomolecules and chemicals to tissues. Herein, we present an electrochemical imaging method for evaluating the endothelial permeability. In this method, the diffusion of electrochemical tracers, [Fe(CN)6]4-, through a monolayer of human umbilical vein endothelial cells (HUVECs) was monitored using a large-scale integration-based device containing 400 electrodes. In conventional tracer-based assays, tracers that diffuse through an HUVEC monolayer into another channel are detected. In contrast, the present method does not employ separated channels. In detail, a HUVEC monolayer is immersed in a solution containing [Fe(CN)6]4- on the device. As [Fe(CN)6]4- is oxidized and consumed at the packed electrodes, [Fe(CN)6]4- begins to diffuse through the monolayer from the bulk solution to the electrodes and the obtained currents depend on the endothelial permeability. As a proof-of-concept, the effects of histamine on the monolayer were monitored. Also, an HUVEC monolayer was cocultured with cancer spheroids, and the endothelial permeability was monitored to evaluate the metastasis of the cancer spheroids. Unlike conventional methods, the device can provide spatial information, allowing the interaction between the monolayer and the spheroids to be monitored. The developed method is a promising tool for organs-on-a-chip and drug screening in vitro.
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Affiliation(s)
- Kosuke Ino
- Graduate
School of Engineering, Tohoku University, 6-6-11 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan
| | - Hao-Jen Pai
- Graduate
School of Environmental Studies, Tohoku
University, 6-6-11 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan
| | - Kaoru Hiramoto
- Graduate
School of Environmental Studies, Tohoku
University, 6-6-11 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan
| | - Yoshinobu Utagawa
- Graduate
School of Environmental Studies, Tohoku
University, 6-6-11 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan
| | - Yuji Nashimoto
- Graduate
School of Engineering, Tohoku University, 6-6-11 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan
- Frontier
Research Institute for Interdisciplinary Sciences, Tohoku University, 6-3 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8578, Japan
| | - Hitoshi Shiku
- Graduate
School of Engineering, Tohoku University, 6-6-11 Aramaki-aza Aoba, Aoba-ku, Sendai 980-8579, Japan
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34
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Bergara-Muguruza L, Mäkelä K, Yrjälä T, Salonen J, Yamashita K, Nakamura M. Surface Electric Fields Increase Human Osteoclast Resorption through Improved Wettability on Carbonate-Incorporated Apatite. ACS Appl Mater Interfaces 2021; 13:58270-58278. [PMID: 34860490 PMCID: PMC8678988 DOI: 10.1021/acsami.1c14358] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2021] [Accepted: 11/23/2021] [Indexed: 06/02/2023]
Abstract
Osteoclast-mediated bioresorption can be an efficient means of incorporating the dissolution of biomaterials in the bone remodeling process. Because of the compositionally and structurally close resemblance of biomaterials with the natural mineral phases of the bone matrix, synthetic carbonate-substituted apatite (CA) is considered as an ideal biomaterial for clinical use. The present study therefore investigated the effects of electrical polarization on the surface characteristics and interactions with human osteoclasts of hydroxyapatite (HA) and CA. Electrical polarization was found to improve the surface wettability of these materials by increasing the surface free energy, and this effect was maintained for 1 month. Analyses of human osteoclast cultures established that CA subjected to a polarization treatment enhanced osteoclast resorption but did not affect the early differentiation phase or the adherent morphology of the osteoclasts as evaluated by staining. These data suggest that the surface characteristics of the CA promoted osteoclast resorption. The results of this work are expected to contribute to the future design of cell-mediated bioresorbable biomaterials capable of resorption by osteoclasts and of serving as a scaffold for bone regeneration.
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Affiliation(s)
- Leire Bergara-Muguruza
- Medicity
Research Laboratory, Faculty of Medicine, University of Turku, Tykistökatu 6, 20520 Turku, Finland
| | - Keijo Mäkelä
- Turku
University Hospital, University of Turku, Luolavuorentie 2, 20700 Turku, Finland
| | - Tommi Yrjälä
- Turku
University Hospital, University of Turku, Luolavuorentie 2, 20700 Turku, Finland
- Department
of Anesthesia and Intensive Care, University
of Turku, Luolavuorentie
2, 20700 Turku, Finland
| | - Jukka Salonen
- Medicity
Research Laboratory, Faculty of Medicine, University of Turku, Tykistökatu 6, 20520 Turku, Finland
| | - Kimihiro Yamashita
- Graduate
School of Medical and Dental Science, Tokyo
Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan
| | - Miho Nakamura
- Medicity
Research Laboratory, Faculty of Medicine, University of Turku, Tykistökatu 6, 20520 Turku, Finland
- Institute
of Biomaterials and Bioengineering, Tokyo
Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda, Tokyo 1010062 Japan
- Graduate
School of Engineering, Tohoku University, 6-6 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi 9808579 Japan
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35
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Nomura O, Wiseman J, Sunohara M, Akatsu H, Lajoie SP. Japanese medical learners' achievement emotions: Accounting for culture in translating Western medical educational theories and instruments into an asian context. Adv Health Sci Educ Theory Pract 2021; 26:1255-1276. [PMID: 33978878 PMCID: PMC8452569 DOI: 10.1007/s10459-021-10048-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Accepted: 04/09/2021] [Indexed: 06/09/2023]
Abstract
Medical learners' achievement emotions during educational activities have remained unexamined in Asian cultural contexts. The Medical Emotion Scale (MES) was previously developed to assess achievement emotions experienced by North American medical learners during learning activities. The goal of this study was to create and validate a Japanese version of the Medical Emotion Scale (J-MES). We translated the MES into Japanese and conducted two initial validation studies of the J-MES. In the first pilot study, we asked five, native-Japanese, second-year medical students to assess their emotions with the J-MES during a computer-based clinical reasoning activity. Each participant was then interviewed to assess the clarity and suitability of the items. In a second, larger study, 41 Japanese medical students were recruited to assess the psychometric properties of the J-MES. We also conducted individual, semi-structured interviews with ten of these participants to explore potential cultural features in the achievement emotions of Japanese students. The first pilot study demonstrated that the J-MES descriptions were clear, and that the scale captured an appropriate range of emotions. The second study revealed that the J-MES scale's profiles and internal structure were largely consistent with control-value theory. The achievement emotions of pride, compassion, and surprise in the J-MES were found to be susceptible to cultural differences between North American and Japanese contexts. Our findings clearly demonstrated the scoring capacity, generalizability, and extrapolability of the J-MES.
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Affiliation(s)
- Osamu Nomura
- Department of Emergency and Disaster Medicine, Hirosaki University, 5 Zaifu-cho, Hirosaki, Japan.
- Department of Educational & Counselling Psychology, McGill University, Montreal, Canada.
- Institute of Health Science Education, McGill University, Montreal, Canada.
| | - Jeffrey Wiseman
- Department of Educational & Counselling Psychology, McGill University, Montreal, Canada
- Institute of Health Science Education, McGill University, Montreal, Canada
| | - Momoka Sunohara
- Department of Psychology, Concordia University, Montreal, Canada
| | - Haruko Akatsu
- Medical Education Office, International University of Health and Welfare, Narita, Japan
| | - Susanne P Lajoie
- Department of Educational & Counselling Psychology, McGill University, Montreal, Canada
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36
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Nagase T, So YG, Yasui H, Ishida T, Yoshida HK, Tanaka Y, Saitoh K, Ikarashi N, Kawaguchi Y, Kuwahara M, Nagao M. Observation of domain wall bimerons in chiral magnets. Nat Commun 2021; 12:3490. [PMID: 34108478 PMCID: PMC8190141 DOI: 10.1038/s41467-021-23845-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 05/19/2021] [Indexed: 12/03/2022] Open
Abstract
Topological defects embedded in or combined with domain walls have been proposed in various systems, some of which are referred to as domain wall skyrmions or domain wall bimerons. However, the experimental observation of such topological defects remains an ongoing challenge. Here, using Lorentz transmission electron microscopy, we report the experimental discovery of domain wall bimerons in chiral magnet Co-Zn-Mn(110) thin films. By applying a magnetic field, multidomain structures develop, and simultaneously, chained or isolated bimerons arise as the localized state between the domains with the opposite in-plane components of net magnetization. The multidomain formation is attributed to magnetic anisotropy and dipolar interaction, and domain wall bimerons are stabilized by the Dzyaloshinskii-Moriya interaction. In addition, micromagnetic simulations show that domain wall bimerons appear for a wide range of conditions in chiral magnets with cubic magnetic anisotropy. Our results promote further study in various fields of physics.
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Affiliation(s)
- Tomoki Nagase
- Department of Electronics, Graduate School of Engineering, Nagoya University, Nagoya, Japan.
| | - Yeong-Gi So
- Department of Materials Science, Graduate School of Engineering Science, Akita University, Akita, Japan
| | - Hayata Yasui
- Department of Materials Science, Graduate School of Engineering Science, Akita University, Akita, Japan
| | - Takafumi Ishida
- Advanced Measurement Technology Center, Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, Japan
- Department of Applied Physics, Graduate School of Engineering, Nagoya University, Nagoya, Japan
| | - Hiroyuki K Yoshida
- Department of Physics, Faculty of Science, Hokkaido University, Sapporo, Japan
| | - Yukio Tanaka
- Department of Applied Physics, Graduate School of Engineering, Nagoya University, Nagoya, Japan
| | - Koh Saitoh
- Advanced Measurement Technology Center, Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, Japan
- Department of Applied Physics, Graduate School of Engineering, Nagoya University, Nagoya, Japan
| | - Nobuyuki Ikarashi
- Department of Electronics, Graduate School of Engineering, Nagoya University, Nagoya, Japan
- Center for Integrated Research of Future Electronics, Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, Japan
| | - Yuki Kawaguchi
- Department of Applied Physics, Graduate School of Engineering, Nagoya University, Nagoya, Japan
| | - Makoto Kuwahara
- Advanced Measurement Technology Center, Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, Japan.
- Department of Applied Physics, Graduate School of Engineering, Nagoya University, Nagoya, Japan.
| | - Masahiro Nagao
- Department of Electronics, Graduate School of Engineering, Nagoya University, Nagoya, Japan.
- Center for Integrated Research of Future Electronics, Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya, Japan.
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37
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Hayashi K, Yamamoto Y, Tamura M, Tokonami S, Iida T. Damage-free light-induced assembly of intestinal bacteria with a bubble-mimetic substrate. Commun Biol 2021; 4:385. [PMID: 33753856 PMCID: PMC7985151 DOI: 10.1038/s42003-021-01807-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2020] [Accepted: 01/28/2021] [Indexed: 12/13/2022] Open
Abstract
Rapid evaluation of functions in densely assembled bacteria is a crucial issue in the efficient study of symbiotic mechanisms. If the interaction between many living microbes can be controlled and accelerated via remote assembly, a cultivation process requiring a few days can be ommitted, thus leading to a reduction in the time needed to analyze the bacterial functions. Here, we show the rapid, damage-free, and extremely dense light-induced assembly of microbes over a submillimeter area with the "bubble-mimetic substrate (BMS)". In particular, we successfully assembled 104-105 cells of lactic acid bacteria (Lactobacillus casei), achieving a survival rate higher than 95% within a few minutes without cultivation process. This type of light-induced assembly on substrates like BMS, with the maintenance of the inherent functions of various biological samples, can pave the way for the development of innovative methods for rapid and highly efficient analysis of functions in a variety of microbes.
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Affiliation(s)
- Kota Hayashi
- Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Osaka, Japan
- Research Institute for Light-induced Acceleration System (RILACS), Osaka Prefecture University, Osaka, Japan
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Osaka, Japan
| | - Yasuyuki Yamamoto
- Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Osaka, Japan
- Research Institute for Light-induced Acceleration System (RILACS), Osaka Prefecture University, Osaka, Japan
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Osaka, Japan
| | - Mamoru Tamura
- Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Osaka, Japan
- Research Institute for Light-induced Acceleration System (RILACS), Osaka Prefecture University, Osaka, Japan
| | - Shiho Tokonami
- Research Institute for Light-induced Acceleration System (RILACS), Osaka Prefecture University, Osaka, Japan.
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Osaka, Japan.
| | - Takuya Iida
- Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Osaka, Japan.
- Research Institute for Light-induced Acceleration System (RILACS), Osaka Prefecture University, Osaka, Japan.
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38
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Nishimura Y, Oshimi K, Umehara Y, Kumon Y, Miyaji K, Yukawa H, Shikano Y, Matsubara T, Fujiwara M, Baba Y, Teki Y. Wide-field fluorescent nanodiamond spin measurements toward real-time large-area intracellular thermometry. Sci Rep 2021; 11:4248. [PMID: 33608613 PMCID: PMC7895939 DOI: 10.1038/s41598-021-83285-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Accepted: 01/29/2021] [Indexed: 01/24/2023] Open
Abstract
Measuring optically detected magnetic resonance (ODMR) of diamond nitrogen vacancy centers significantly depends on the photon detectors used. We study camera-based wide-field ODMR measurements to examine the performance in thermometry by comparing the results to those of the confocal-based ODMR detection. We show that the temperature sensitivity of the camera-based measurements can be as high as that of the confocal detection and that possible artifacts of the ODMR shift are produced owing to the complexity of the camera-based measurements. Although measurements from wide-field ODMR of nanodiamonds in living cells can provide temperature precisions consistent with those of confocal detection, the technique requires the integration of rapid ODMR measurement protocols for better precisions. Our results can aid the development of camera-based real-time large-area spin-based thermometry of living cells.
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Affiliation(s)
- Yushi Nishimura
- Department of Chemistry, Graduate School of Science, Osaka City University, Osaka, 558-8585, Japan
- Institute of Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology, Chiba, 263-8555, Japan
| | - Keisuke Oshimi
- Department of Chemistry, Graduate School of Science, Osaka City University, Osaka, 558-8585, Japan
| | - Yumi Umehara
- Department of Chemistry, Graduate School of Science, Osaka City University, Osaka, 558-8585, Japan
| | - Yuka Kumon
- Department of Biomolecular Engineering, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan
| | - Kazu Miyaji
- Department of Biomolecular Engineering, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan
| | - Hiroshi Yukawa
- Department of Biomolecular Engineering, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan
- Institute of Nano-Life-Systems, Institutes of Innovation for Future Society, Nagoya University, Nagoya, 464-8603, Japan
- Institute of Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology, Chiba, 263-8555, Japan
| | - Yutaka Shikano
- Quantum Computing Center, Keio University, Yokohama, 223-8522, Japan
- Institute for Quantum Studies, Chapman University, Orange , CA, 92866, USA
- JST PRESTO, Saitama, 332-0012, Japan
| | - Tsutomu Matsubara
- Department of Anatomy and Regenerative Biology, Graduate School of Medicine, Osaka City University, Osaka, 545-8585, Japan
| | - Masazumi Fujiwara
- Department of Chemistry, Graduate School of Science, Osaka City University, Osaka, 558-8585, Japan.
| | - Yoshinobu Baba
- Department of Biomolecular Engineering, Graduate School of Engineering, Nagoya University, Nagoya, 464-8603, Japan
- Institute of Nano-Life-Systems, Institutes of Innovation for Future Society, Nagoya University, Nagoya, 464-8603, Japan
- Institute of Quantum Life Science, National Institutes for Quantum and Radiological Science and Technology, Chiba, 263-8555, Japan
| | - Yoshio Teki
- Department of Chemistry, Graduate School of Science, Osaka City University, Osaka, 558-8585, Japan
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39
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Aizawa N, Matsumoto A, Yasuda T. Thermal equilibration between singlet and triplet excited states in organic fluorophore for submicrosecond delayed fluorescence. Sci Adv 2021; 7:7/7/eabe5769. [PMID: 33579700 PMCID: PMC7880586 DOI: 10.1126/sciadv.abe5769] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 12/24/2020] [Indexed: 05/22/2023]
Abstract
In any complex molecular system, electronic excited states with different spin multiplicities can be described via a simple statistical thermodynamic formalism if the states are in thermal equilibrium. However, this ideal situation has hitherto been infeasible for efficient fluorescent organic molecules. Here, we report a highly emissive metal-free purely organic fluorophore that enables thermal equilibration between singlet and triplet excited states. The key to this unconventional excitonic behavior is the exceptionally fast spin-flipping reverse intersystem crossing from the triplet to singlet excited states with a rate constant exceeding 108 per second, which is considerably higher than that of radiative decay (fluorescence) from the singlet excited state. The present fluorophoric system exhibits an emission lifetime as short as 750 nanoseconds and, therefore, allows organic light-emitting diodes to demonstrate external electroluminescence quantum efficiency exceeding 20% even at a practical high luminance of more than 10,000 candelas per square meter.
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Affiliation(s)
- Naoya Aizawa
- INAMORI Frontier Research Center (IFRC), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Akinobu Matsumoto
- INAMORI Frontier Research Center (IFRC), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Takuma Yasuda
- INAMORI Frontier Research Center (IFRC), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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40
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Hirokane Y, Nii Y, Masuda H, Onose Y. Nonreciprocal thermal transport in a multiferroic helimagnet. Sci Adv 2020; 6:6/40/eabd3703. [PMID: 32998887 PMCID: PMC7527214 DOI: 10.1126/sciadv.abd3703] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Accepted: 08/13/2020] [Indexed: 05/27/2023]
Abstract
Breaking of spatial inversion symmetry induces unique phenomena in condensed matter. In particular, by combining this symmetry with magnetic fields or another type of time-reversal symmetry breaking, noncentrosymmetric materials can be made to exhibit nonreciprocal responses, which are responses that differ for rightward and leftward stimuli. However, the effect of spatial inversion symmetry breaking on thermal transport in uniform media remains to be elucidated. Here, we show nonreciprocal thermal transport in the multiferroic helimagnet TbMnO3 The longitudinal thermal conductivity depends on whether the thermal current is parallel or antiparallel to the vector product of the electric polarization and magnetization. This phenomenon is thermal rectification that is controllable with external fields in a uniform crystal. This discovery may pave the way to thermal diodes with controllability and scalability.
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Affiliation(s)
- Yuji Hirokane
- Department of Basic Science, University of Tokyo, Tokyo 153-8902, Japan
| | - Yoichi Nii
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
- PRESTO, Japan Science and Technology Agency (JST), Kawaguchi 332-0012, Japan
| | - Hidetoshi Masuda
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
| | - Yoshinori Onose
- Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
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41
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Fujiwara M, Sun S, Dohms A, Nishimura Y, Suto K, Takezawa Y, Oshimi K, Zhao L, Sadzak N, Umehara Y, Teki Y, Komatsu N, Benson O, Shikano Y, Kage-Nakadai E. Real-time nanodiamond thermometry probing in vivo thermogenic responses. Sci Adv 2020; 6:eaba9636. [PMID: 32917703 PMCID: PMC7486095 DOI: 10.1126/sciadv.aba9636] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Accepted: 07/22/2020] [Indexed: 05/24/2023]
Abstract
Real-time temperature monitoring inside living organisms provides a direct measure of their biological activities. However, it is challenging to reduce the size of biocompatible thermometers down to submicrometers, despite their potential applications for the thermal imaging of subtissue structures with single-cell resolution. Here, using quantum nanothermometers based on optically accessible electron spins in nanodiamonds, we demonstrate in vivo real-time temperature monitoring inside Caenorhabditis elegans worms. We developed a microscope system that integrates a quick-docking sample chamber, particle tracking, and an error correction filter for temperature monitoring of mobile nanodiamonds inside live adult worms with a precision of ±0.22°C. With this system, we determined temperature increases based on the worms' thermogenic responses during the chemical stimuli of mitochondrial uncouplers. Our technique demonstrates the submicrometer localization of temperature information in living animals and direct identification of their pharmacological thermogenesis, which may allow for quantification of their biological activities based on temperature.
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Affiliation(s)
- Masazumi Fujiwara
- Department of Chemistry, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan.
| | - Simo Sun
- Food and Human Health Sciences, Graduate School of Human Life Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Alexander Dohms
- Institut für Physik and IRIS Adlershof, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
| | - Yushi Nishimura
- Department of Chemistry, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Ken Suto
- Department of Chemistry, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Yuka Takezawa
- Food and Human Health Sciences, Graduate School of Human Life Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Keisuke Oshimi
- Department of Chemistry, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Li Zhao
- State Key Laboratory of Radiation Medicine and Protection, School for Radiological and Interdisciplinary Sciences (RAD-X) and Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou 215123, P. R. China
| | - Nikola Sadzak
- Institut für Physik and IRIS Adlershof, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
| | - Yumi Umehara
- Department of Chemistry, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Yoshio Teki
- Department of Chemistry, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan
| | - Naoki Komatsu
- Graduate School of Human and Environmental Studies, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Oliver Benson
- Institut für Physik and IRIS Adlershof, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin, Germany
| | - Yutaka Shikano
- Quantum Computing Center, Keio University, 3-14-1 Hiyoshi Kohoku, Yokohama 223-8522, Japan.
- Institute for Quantum Studies, Chapman University, 1 University Dr., Orange, CA 92866, USA
| | - Eriko Kage-Nakadai
- Food and Human Health Sciences, Graduate School of Human Life Science, Osaka City University, Sumiyoshi-ku, Osaka 558-8585, Japan.
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42
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Umakoshi T, Tanaka M, Saito Y, Verma P. White nanolight source for optical nanoimaging. Sci Adv 2020; 6:eaba4179. [PMID: 32537508 PMCID: PMC7269664 DOI: 10.1126/sciadv.aba4179] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 04/06/2020] [Indexed: 05/30/2023]
Abstract
Nanolight sources, which are based on resonant excitation of plasmons near a sharp metallic nanostructure, have attracted tremendous interest in the vast research fields of optical nanoimaging. However, being a resonant phenomenon, this ideally works only for one wavelength that resonates with the plasmons. Multiple wavelengths of light in a broad range confined to one spot within a nanometric volume would be an interesting form of light, useful in numerous applications. Plasmon nanofocusing can generate a nanolight source through the propagation and adiabatic compressions of plasmons on a tapered metallic nanostructure, which is independent of wavelength, as it is based on the propagation, rather than resonance, of plasmons. Here, we report the generation of a white nanolight source spanning over the entire visible range through plasmon nanofocusing and demonstrate spectral bandgap nanoimaging of carbon nanotubes. Our experimental demonstration of the white nanolight source would stimulate diverse research fields toward next-generation nanophotonic technologies.
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Affiliation(s)
- Takayuki Umakoshi
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
- PRESTO, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Misaki Tanaka
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
| | - Yuika Saito
- Department of Chemistry, Gakushuin University, Toshima-ku, Tokyo 171-0031, Japan
| | - Prabhat Verma
- Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
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43
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Isozaki A, Nakagawa Y, Loo MH, Shibata Y, Tanaka N, Setyaningrum DL, Park JW, Shirasaki Y, Mikami H, Huang D, Tsoi H, Riche CT, Ota T, Miwa H, Kanda Y, Ito T, Yamada K, Iwata O, Suzuki K, Ohnuki S, Ohya Y, Kato Y, Hasunuma T, Matsusaka S, Yamagishi M, Yazawa M, Uemura S, Nagasawa K, Watarai H, Di Carlo D, Goda K. Sequentially addressable dielectrophoretic array for high-throughput sorting of large-volume biological compartments. Sci Adv 2020; 6:eaba6712. [PMID: 32524002 PMCID: PMC7259936 DOI: 10.1126/sciadv.aba6712] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 03/25/2020] [Indexed: 05/27/2023]
Abstract
Droplet microfluidics has become a powerful tool in precision medicine, green biotechnology, and cell therapy for single-cell analysis and selection by virtue of its ability to effectively confine cells. However, there remains a fundamental trade-off between droplet volume and sorting throughput, limiting the advantages of droplet microfluidics to small droplets (<10 pl) that are incompatible with long-term maintenance and growth of most cells. We present a sequentially addressable dielectrophoretic array (SADA) sorter to overcome this problem. The SADA sorter uses an on-chip array of electrodes activated and deactivated in a sequence synchronized to the speed and position of a passing target droplet to deliver an accumulated dielectrophoretic force and gently pull it in the direction of sorting in a high-speed flow. We use it to demonstrate large-droplet sorting with ~20-fold higher throughputs than conventional techniques and apply it to long-term single-cell analysis of Saccharomyces cerevisiae based on their growth rate.
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Affiliation(s)
- A. Isozaki
- Department of Chemistry, Graduate School of Science, University of Tokyo, East Chemistry Building, Room 213, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Kanagawa Institute of Industrial Science and Technology, 3-2-1 Sakado, Takatsu-ku, Kawasaki-shi, Kanagawa 213-0012, Japan
| | - Y. Nakagawa
- Department of Chemistry, Graduate School of Science, University of Tokyo, East Chemistry Building, Room 213, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - M. H. Loo
- Department of Chemistry, Graduate School of Science, University of Tokyo, East Chemistry Building, Room 213, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Y. Shibata
- Department of Chemistry, Graduate School of Science, University of Tokyo, East Chemistry Building, Room 213, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - N. Tanaka
- Department of Chemistry, Graduate School of Science, University of Tokyo, East Chemistry Building, Room 213, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - D. L. Setyaningrum
- Department of Chemistry, Graduate School of Science, University of Tokyo, East Chemistry Building, Room 213, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - J.-W. Park
- Department of Chemistry, Graduate School of Science, University of Tokyo, East Chemistry Building, Room 213, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Y. Shirasaki
- Department of Biological Sciences, Graduate School of Science, University of Tokyo, Faculty of Science Building 1 (East), Room 575, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - H. Mikami
- Department of Chemistry, Graduate School of Science, University of Tokyo, East Chemistry Building, Room 213, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - D. Huang
- Department of Chemistry, Graduate School of Science, University of Tokyo, East Chemistry Building, Room 213, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - H. Tsoi
- Department of Chemistry, Graduate School of Science, University of Tokyo, East Chemistry Building, Room 213, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - C. T. Riche
- Department of Bioengineering, Samueli School of Engineering, University of California, Los Angeles, 420 Westwood Plaza, 5121E Engineering V, Los Angeles, CA 90095, USA
| | - T. Ota
- Department of Chemistry, Graduate School of Science, University of Tokyo, East Chemistry Building, Room 213, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - H. Miwa
- Department of Chemistry, Graduate School of Science, University of Tokyo, East Chemistry Building, Room 213, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Y. Kanda
- Department of Chemistry, Graduate School of Science, University of Tokyo, East Chemistry Building, Room 213, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - T. Ito
- Department of Chemistry, Graduate School of Science, University of Tokyo, East Chemistry Building, Room 213, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Japan Science and Technology Agency, 4-1-8, Honcho, Kawaguchi-shi, Saitama 332-0012, Japan
| | - K. Yamada
- R&D Department, euglena Co., Ltd., 75-1, Ono-machi, Tsurumi-ku, Yokohama-shi 230-0046, Japan
| | - O. Iwata
- R&D Department, euglena Co., Ltd., 75-1, Ono-machi, Tsurumi-ku, Yokohama-shi 230-0046, Japan
| | - K. Suzuki
- R&D Department, euglena Co., Ltd., 75-1, Ono-machi, Tsurumi-ku, Yokohama-shi 230-0046, Japan
| | - S. Ohnuki
- Department of Integrated Biosciences, Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8562, Japan
| | - Y. Ohya
- Department of Integrated Biosciences, Graduate School of Frontier Sciences, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8562, Japan
- AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL), National Institute of Advanced Industrial Science and Technology (AIST), 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8589, Japan
| | - Y. Kato
- Graduate School of Science, Technology Innovation, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
| | - T. Hasunuma
- Graduate School of Science, Technology Innovation, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
- Engineering Biology Research Center, Kobe University, 1-1 Rokkodai, Nada, Kobe 657-8501, Japan
| | - S. Matsusaka
- Clinical Research and Regional Innovation, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan
| | - M. Yamagishi
- Department of Biological Sciences, Graduate School of Science, University of Tokyo, Faculty of Science Building 1 (East), Room 575, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - M. Yazawa
- Department of Rehabilitation and Regenerative Medicine, Pharmacology, Columbia University, 650 West 168th Street, BB1108, New York, NY 10032, USA
| | - S. Uemura
- Department of Biological Sciences, Graduate School of Science, University of Tokyo, Faculty of Science Building 1 (East), Room 575, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - K. Nagasawa
- Division of Stem Cell Cellomics, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - H. Watarai
- Division of Stem Cell Cellomics, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
- Department of Immunology and Stem Cell Biology, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, Ishikawa 920-8640, Japan
| | - D. Di Carlo
- Department of Bioengineering, Samueli School of Engineering, University of California, Los Angeles, 420 Westwood Plaza, 5121E Engineering V, Los Angeles, CA 90095, USA
| | - K. Goda
- Department of Chemistry, Graduate School of Science, University of Tokyo, East Chemistry Building, Room 213, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- Department of Bioengineering, Samueli School of Engineering, University of California, Los Angeles, 420 Westwood Plaza, 5121E Engineering V, Los Angeles, CA 90095, USA
- Japan Science and Technology Agency, 4-1-8, Honcho, Kawaguchi-shi, Saitama 332-0012, Japan
- Institute of Technological Sciences, Wuhan University, Hubei 430072, China
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44
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Uetani K, Izakura S, Koga H, Nogi M. Thermal diffusivity modulation driven by the interfacial elastic dynamics between cellulose nanofibers. Nanoscale Adv 2020; 2:1024-1030. [PMID: 36133067 PMCID: PMC9417970 DOI: 10.1039/c9na00734b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Accepted: 01/20/2020] [Indexed: 05/17/2023]
Abstract
Thermal transport modulating materials show great potential to address the heat problems in a wide range of engineering fields. However, tuning the thermal conductivity of solid-state materials is practically difficult because it requires specific or extreme stimulation, such as chemical composition change, a phase transition, or large applied fluctuations, to change the internal bulk structures. Here, we report reversible switching of the in-plane thermal diffusivity of densely packed cellulose nanofiber (CNF) films by ∼15% by simple mechanical strain as small as 0.3%. From analysis of the stress relaxation profiles and the different bulk densities of the CNF films, the interfacial elastic dynamics between the strongly hydrogen bonded CNFs were found to exhibit thermal diffusivity modulation by tuning the interfacial thermal resistance, rather than changing the bulk structure of the CNFs. Our concept of interfacial-elasticity-driven thermal diffusivity switching has the potential to enhance the on/off rate and extensibility toward practical use owing to the high designability of the interfacial conditions.
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Affiliation(s)
- Kojiro Uetani
- The Institute of Scientific and Industrial Research (ISIR), Osaka University Mihogaoka 8-1, Ibaraki-shi Osaka 567-0047 Japan
| | - Shogo Izakura
- Graduate School of Engineering, Osaka University Mihogaoka 8-1, Ibaraki-shi Osaka 567-0047 Japan
| | - Hirotaka Koga
- The Institute of Scientific and Industrial Research (ISIR), Osaka University Mihogaoka 8-1, Ibaraki-shi Osaka 567-0047 Japan
| | - Masaya Nogi
- The Institute of Scientific and Industrial Research (ISIR), Osaka University Mihogaoka 8-1, Ibaraki-shi Osaka 567-0047 Japan
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45
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Tokonami S, Kurita S, Yoshikawa R, Sakurai K, Suehiro T, Yamamoto Y, Tamura M, Karthaus O, Iida T. Light-induced assembly of living bacteria with honeycomb substrate. Sci Adv 2020; 6:eaaz5757. [PMID: 32158951 PMCID: PMC7048417 DOI: 10.1126/sciadv.aaz5757] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Accepted: 12/05/2019] [Indexed: 05/14/2023]
Abstract
Some bacteria are recognized to produce useful substances and electric currents, offering a promising solution to environmental and energy problems. However, applications of high-performance microbial devices require a method to accumulate living bacteria into a higher-density condition in larger substrates. Here, we propose a method for the high-density assembly of bacteria (106 to 107 cells/cm2) with a high survival rate of 80 to 90% using laser-induced convection onto a self-organized honeycomb-like photothermal film. Furthermore, the electricity-producing bacteria can be optically assembled, and the electrical current can be increased by one to two orders of magnitude simply by increasing the number of laser irradiations. This concept can facilitate the development of high-density microbial energy conversion devices and provide new platforms for unconventional environmental technology.
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Affiliation(s)
- Shiho Tokonami
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8570, Japan
- Research Institute for Light-induced Acceleration System, Osaka Prefecture University, Sakai 599-8570, Japan
| | - Shinya Kurita
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8570, Japan
- Research Institute for Light-induced Acceleration System, Osaka Prefecture University, Sakai 599-8570, Japan
| | - Ryo Yoshikawa
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8570, Japan
- Research Institute for Light-induced Acceleration System, Osaka Prefecture University, Sakai 599-8570, Japan
| | - Kenji Sakurai
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8570, Japan
- Research Institute for Light-induced Acceleration System, Osaka Prefecture University, Sakai 599-8570, Japan
| | - Taichi Suehiro
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8570, Japan
- Research Institute for Light-induced Acceleration System, Osaka Prefecture University, Sakai 599-8570, Japan
- Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8570, Japan
| | - Yasuyuki Yamamoto
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai 599-8570, Japan
- Research Institute for Light-induced Acceleration System, Osaka Prefecture University, Sakai 599-8570, Japan
- Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8570, Japan
| | - Mamoru Tamura
- Research Institute for Light-induced Acceleration System, Osaka Prefecture University, Sakai 599-8570, Japan
- Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8570, Japan
| | - Olaf Karthaus
- Department of Applied Chemistry and Bioscience, Chitose Institute of Science and Technology, Chitose, Hokkaido 066-8655, Japan
| | - Takuya Iida
- Research Institute for Light-induced Acceleration System, Osaka Prefecture University, Sakai 599-8570, Japan
- Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8570, Japan
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46
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Takehara R, Sunami K, Miyagawa K, Miyamoto T, Okamoto H, Horiuchi S, Kato R, Kanoda K. Topological charge transport by mobile dielectric-ferroelectric domain walls. Sci Adv 2019; 5:eaax8720. [PMID: 31763453 PMCID: PMC6858255 DOI: 10.1126/sciadv.aax8720] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Accepted: 09/19/2019] [Indexed: 06/10/2023]
Abstract
The concept of topology has been widely applied in condensed matter physics, leading to the identification of peculiar electronic states on three-dimensional (3D) surfaces or 2D lines separating topologically distinctive regions. In the systems explored so far, the topological boundaries are built-in walls; thus, their motional degrees of freedom, which potentially bring about new paradigms, have been experimentally inaccessible. Here, working with a quasi-1D organic material with a charge-transfer instability, we show that mobile neutral-ionic (dielectric-ferroelectric) domain boundaries with topological charges carry strongly 1D-confined and anomalously large electrical conduction with an energy gap much smaller than the one-particle excitation gap. This consequence is further supported by nuclear magnetic resonance detection of spin solitons, which are required for steady current of topological charges. The present observation of topological charge transport may open a new channel for broad charge transport-related phenomena such as thermoelectric effects.
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Affiliation(s)
- R. Takehara
- Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - K. Sunami
- Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - K. Miyagawa
- Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - T. Miyamoto
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
| | - H. Okamoto
- Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
- AIST-UTokyo Advanced Operando–Measurement Technology Open Innovation Laboratory (OPERANDO-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Chiba 277-8568, Japan
| | - S. Horiuchi
- Flexible Electronics Research Center (FLEC), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
| | - R. Kato
- Condensed Molecular Materials Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
| | - K. Kanoda
- Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
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Abstract
Organic emitting compounds that are based on π-conjugated skeletons have emerged as promising next-generation materials for application in optoelectronic devices. In this Minireview, recent advances in the development of organic emitters that irradiate room-temperature phosphorescence and/or thermally activated delayed fluorescence with extraordinary luminescence properties, such as aggregation-induced emission, mechanochromic luminescence, and circularly polarized luminescence, are discussed.
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Affiliation(s)
- Przemyslaw Data
- Faculty of ChemistrySilesian University of TechnologyM. Strzody 944-100GliwicePoland
- Center of Polymer and Carbon MaterialsPolish Academy of SciencesM. Curie-Sklodowskiej 3441-819ZabrzePoland
| | - Youhei Takeda
- Department of Applied ChemistryGraduate School of EngineeringOsaka UniversityYamadaoka 2-1SuitaOsaka5650871Japan
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Maeng I, Lee YM, Park J, Raga SR, Kang C, Kee CS, Yu BD, Hong S, Ono LK, Qi Y, Jung MC, Nakamura M. Significant THz absorption in CH 3NH 2 molecular defect-incorporated organic-inorganic hybrid perovskite thin film. Sci Rep 2019; 9:5811. [PMID: 30967593 PMCID: PMC6456617 DOI: 10.1038/s41598-019-42359-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Accepted: 03/29/2019] [Indexed: 12/05/2022] Open
Abstract
The valid strong THz absorption at 1.58 THz was probed in the organic-inorganic hybrid perovskite thin film, CH3NH3PbI3, fabricated by sequential vacuum evaporation method. In usual solution-based methods such as 2-step solution and antisolvent, we observed the relatively weak two main absorption peaks at 0.95 and 1.87 THz. The measured absorption spectrum is analyzed by density-functional theory calculations. The modes at 0.95 and 1.87 THz are assigned to the Pb-I vibrations of the inorganic components in the tetragonal phase. By contrast, the origin of the 1.58 THz absorption is due to the structural deformation of Pb-I bonding at the grain boundary incorporated with a CH3NH2 molecular defect.
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Affiliation(s)
- Inhee Maeng
- Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Young Mi Lee
- Beamline department, Pohang Accelerator Laboratory, POSTECH, Pohang, 37673, Republic of Korea
| | - Jinwoo Park
- Department of Physics, University of Seoul, Seoul, 02504, Republic of Korea
| | - Sonia R Raga
- Energy Materials and Surface Sciences Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, 904-0495, Japan
- ARC Centre of Excellence in Exciton Science and Department of Chemical Engineering, Monash University, Clayton, VIC, 3800, Australia
| | - Chul Kang
- Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Chul-Sik Kee
- Advanced Photonics Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Byung Deok Yu
- Department of Physics, University of Seoul, Seoul, 02504, Republic of Korea
| | - Suklyun Hong
- Graphene Research Institute and Department of Physics, Sejong University, Seoul, 05006, Republic of Korea
| | - Luis K Ono
- Energy Materials and Surface Sciences Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, 904-0495, Japan
| | - Yabing Qi
- Energy Materials and Surface Sciences Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, 904-0495, Japan
| | - Min-Cherl Jung
- Division of Materials Science, Nara Institute of Science and Technology, Nara, 630-0192, Japan.
| | - Masakazu Nakamura
- Division of Materials Science, Nara Institute of Science and Technology, Nara, 630-0192, Japan
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Nakayama H, Yamamoto T, An H, Tsuda K, Einaga Y, Ando K. Molecular engineering of Rashba spin-charge converter. Sci Adv 2018; 4:eaar3899. [PMID: 29740602 PMCID: PMC5938226 DOI: 10.1126/sciadv.aar3899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 02/10/2018] [Indexed: 06/08/2023]
Abstract
In heterostructures with broken inversion symmetry, the electrons' motion is coupled to their spin through interface-driven spin-orbit coupling: the Rashba effect. The Rashba effect enables the interconversion between spin and charge currents, offering a variety of novel spintronic phenomena and functionalities. However, despite the significant progress in Rashba physics, controlling the spin-charge conversion in metallic heterostructures remains a major challenge. We show that molecular self-assembly provides a way to engineer the Rashba spin-charge converters. We demonstrate that magnetoresistance and voltage generation originating from the spin-charge conversion in metallic heterostructures can be manipulated by decorating the surface with self-assembled organic monolayers through the cooperative molecular field effect. We also demonstrate reversible phototuning of the spin-charge conversion through light-driven molecular transformations using a molecule that can photoisomerize between the trans and cis states. These findings, with the almost-infinite chemical tunability of organic monolayers, pave the way toward molecular engineering of spin-orbit devices.
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Affiliation(s)
- Hiroyasu Nakayama
- Department of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan
| | - Takashi Yamamoto
- Department of Chemistry, Keio University, Yokohama 223-8522, Japan
| | - Hongyu An
- Department of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan
| | - Kento Tsuda
- Department of Chemistry, Keio University, Yokohama 223-8522, Japan
| | - Yasuaki Einaga
- Department of Chemistry, Keio University, Yokohama 223-8522, Japan
| | - Kazuya Ando
- Department of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan
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50
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Chen JI, Kamei K. Disapproval aversion or inflated inequity acceptance? The impact of expressing emotions in ultimatum bargaining. Exp Econ 2017; 21:836-857. [PMID: 30459524 PMCID: PMC6223739 DOI: 10.1007/s10683-017-9554-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Revised: 10/30/2017] [Accepted: 11/01/2017] [Indexed: 06/09/2023]
Abstract
Past experimental research has shown that when rating systems are available, buyers are more generous in accepting unfair offers in ultimatum bargaining. However, it also suggests that, under these conditions, sellers behave more fairly to avoid receiving negative feedback. This paper experimentally investigates which effect is stronger with the use of a rating system: buyers' inflated inequity acceptance or sellers' disapproval aversion. We explore this question by varying the information condition on the buyers' side. Our experiment shows that in a setup where the size of the pie is common knowledge for both buyers and sellers, when a rating system is present, the sellers exhibit disapproval aversion but the buyers do not display greater acceptance of inequity. By contrast, when only sellers are aware of the size of the pie, sellers behave aggressively to exploit buyers and their behavior does not change in the presence of a rating system; however, buyers display greater acceptance of inequity when a rating system is present. We discuss how these results can be explained by a theoretical model that includes sellers' social disapproval aversion and buyers' disappointment aversion in addition to the players' inequality aversion.
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Affiliation(s)
- Josie I. Chen
- Department of Economics, National Taipei University, No.151, Daxue Rd., Sanxia Dist., New Taipei City, 23741 Taiwan, ROC
| | - Kenju Kamei
- Department of Economics and Finance, Durham University, Mill Hill Lane, Durham, DH1 3LB UK
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