1
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Suzuki Y, Matsumoto K, Nomi R, Arakawa M, Horio T, Terasaki A. Photoelectron Imaging Signature for Selective Formation of Icosahedral Anionic Silver Cages Encapsulating Group 5 Elements: M@Ag 12- (M = V, Nb, and Ta). J Phys Chem Lett 2024; 15:4327-4332. [PMID: 38619361 PMCID: PMC11057432 DOI: 10.1021/acs.jpclett.4c00775] [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: 03/13/2024] [Revised: 04/04/2024] [Accepted: 04/09/2024] [Indexed: 04/16/2024]
Abstract
An assembly of 13 atoms can form highly symmetric architectures like those belonging to D3h, Oh, D5h, and Ih point groups. Here, using photoelectron imaging spectroscopy in combination with density functional theory (DFT) calculations, we present a simple yet convincing experimental signature for the selective formation of icosahedral cages of anionic silver clusters encapsulating a dopant atom of group 5 elements: M@Ag12- (M = V, Nb, and Ta). Their photoelectron images obtained at 4 eV closely resemble one another: only a single ring is observed, which is assignable to photodetachment signals from a 5-fold degenerate superatomic 1D electronic shell in the 1S21P61D10 configuration of valence electrons. The perfect degeneracy represents an unambiguous fingerprint of an icosahedral symmetry, which would otherwise be lifted in all of the other structural isomers. DFT calculations confirm that Ih forms are the most stable and that D5h, Oh, and D3h structures are not found even in metastable states.
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Affiliation(s)
- Yuta Suzuki
- Department of Chemistry,
Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Kazuaki Matsumoto
- Department of Chemistry,
Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Rin Nomi
- Department of Chemistry,
Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | | | - Takuya Horio
- Department of Chemistry,
Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Akira Terasaki
- Department of Chemistry,
Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
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2
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Yaji K, Kuroda K, Tsuda S, Komori F. Spin polarization of photoelectrons emitted from spin-orbit coupled surface states of Pb/Ge(111). Microscopy (Oxf) 2024:dfae021. [PMID: 38661285 DOI: 10.1093/jmicro/dfae021] [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: 01/22/2024] [Revised: 04/15/2024] [Accepted: 04/22/2024] [Indexed: 04/26/2024] Open
Abstract
We report that the spin vector of photoelectrons emitted from an atomic layer Pb grown on a germanium substrate [Pb/Ge(111)] can be controlled using an electric field of light. The spin polarization of photoelectrons excited by a linearly polarized light is precisely investigated by spin- and angle-resolved photoemission spectroscopy. The spin polarization of the photoelectrons observed in the mirror plane reverses between p- and s-polarized lights. Considering the dipole transition selection rule, the surface state of Pb/Ge(111) is represented by a linear combination of symmetric and asymmetric orbital components coupled with spins in mutually opposite directions. The spin direction of the photoelectrons is different from that of the initial state when the electric field vector of linearly polarized light deviates from p- or s-polarization conditions. The quantum interference in the photoexcitation process can determine the direction of the spin vector of photoelectrons.
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Affiliation(s)
- Koichiro Yaji
- Center for Basic Research on Materials, National Institute for Materials Science, 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan
| | - Kenta Kuroda
- Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, 739-8526, Japan
- International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, Higashi-Hiroshima, 739-8526, Japan
| | - Shunsuke Tsuda
- Center for Basic Research on Materials, National Institute for Materials Science, 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan
| | - Fumio Komori
- Center for Basic Research on Materials, National Institute for Materials Science, 3-13 Sakura, Tsukuba, Ibaraki, 305-0003, Japan
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3
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Shimizu D, Sotome H, Miyasaka H, Matsuda K. Optically Distinguishable Electronic Spin-isomers of a Stable Organic Diradical. ACS Cent Sci 2024; 10:890-898. [PMID: 38680568 PMCID: PMC11046471 DOI: 10.1021/acscentsci.4c00284] [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: 02/20/2024] [Revised: 03/23/2024] [Accepted: 03/29/2024] [Indexed: 05/01/2024]
Abstract
Herein, we introduce a model of electronic spin isomers, the electronic counterpart of nuclear spin isomers, by using a stable organic diradical. The diradical, composed of two benzotriazinyl radicals connected by a rigid triptycene skeleton, exhibits a small singlet-triplet energy gap of -3.0 kJ/mol, indicating ca. 1:1 coexistence of the two spin states at room temperature. The diradical shows characteristic near-IR absorption bands, which are absent in the corresponding monoradical subunit. Variable temperature measurements revealed that the absorbance of the NIR band depends on the abundance of the singlet state, allowing us to identify the NIR band as the singlet-specific absorption band. It enables photoexcitation of one of the two spin states coexisting in thermal equilibrium. Transient absorption spectroscopy disclosed that the two spin states independently follow qualitatively different excited-state dynamics. These results demonstrate a novel approach to the design and study of electronic spin isomers based on organic diradicals.
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Affiliation(s)
- Daiki Shimizu
- Department
of Synthetic Chemistry and Biological Chemistry, Graduate School of
Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Hikaru Sotome
- Division
of Frontier Materials Science and Center for Promotion of Advanced
Interdisciplinary Research, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Hiroshi Miyasaka
- Division
of Frontier Materials Science and Center for Promotion of Advanced
Interdisciplinary Research, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Kenji Matsuda
- Department
of Synthetic Chemistry and Biological Chemistry, Graduate School of
Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
- Fukui
Institute for Fundamental Chemistry, Kyoto
University, Sakyo-ku, Kyoto 606-8103, Japan
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4
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Fujino T, Kameyama R, Onozuka K, Matsuo K, Dekura S, Miyamoto T, Guo Z, Okamoto H, Nakamura T, Yoshimi K, Kitou S, Arima TH, Sato H, Yamamoto K, Takahashi A, Sawa H, Nakamura Y, Mori H. Orbital hybridization of donor and acceptor to enhance the conductivity of mixed-stack complexes. Nat Commun 2024; 15:3028. [PMID: 38627402 PMCID: PMC11021477 DOI: 10.1038/s41467-024-47298-1] [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: 08/11/2023] [Accepted: 03/22/2024] [Indexed: 04/19/2024] Open
Abstract
Mixed-stack complexes which comprise columns of alternating donors and acceptors are organic conductors with typically poor electrical conductivity because they are either in a neutral or highly ionic state. This indicates that conductive carriers are insufficient or are mainly localized. In this study, mixed-stack complexes that uniquely exist at the neutral-ionic boundary were synthesized by combining donors (bis(3,4-ethylenedichalcogenothiophene)) and acceptors (fluorinated tetracyanoquinodimethanes) with similar energy levels and orbital symmetry between the highest occupied molecular orbital of the donor and the lowest unoccupied molecular orbital of the acceptor. Surprisingly, the orbitals were highly hybridized in the single-crystal complexes, enhancing the room-temperature conductivity (10-4-0.1 S cm-1) of mixed-stack complexes. Specifically, the maximum conductivity was the highest reported for single-crystal mixed-stack complexes under ambient pressures. The unique electronic structures at the neutral-ionic boundary exhibited structural perturbations between their electron-itinerant and localized states, causing abrupt temperature-dependent changes in their electrical, optical, dielectric, and magnetic properties.
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Affiliation(s)
- Tomoko Fujino
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan.
| | - Ryohei Kameyama
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - Kota Onozuka
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - Kazuki Matsuo
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - Shun Dekura
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - Tatsuya Miyamoto
- Department of Advanced Materials Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan
| | - Zijing Guo
- Department of Advanced Materials Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan
| | - Hiroshi Okamoto
- Department of Advanced Materials Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan
| | - Toshikazu Nakamura
- Institute for Molecular Science, 38 Nishigo-Naka, Myodaiji, Okazaki, Aichi, 444-8585, Japan
| | - Kazuyoshi Yoshimi
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan
| | - Shunsuke Kitou
- Department of Advanced Materials Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan
| | - Taka-Hisa Arima
- Department of Advanced Materials Science, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8561, Japan
- RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan
| | - Hiroyasu Sato
- Rigaku Corporation, 3-9-12 Matsubara, Akishima, Tokyo, 196-8666, Japan
| | - Kaoru Yamamoto
- Department of Physics, Okayama University of Science, 1-1 Ridaicho, Kita-ku, Okayama, 700-0005, Japan
| | - Akira Takahashi
- Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi, 466-8555, Japan
| | - Hiroshi Sawa
- Department of Applied Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
| | - Yuiga Nakamura
- Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5198, Japan
| | - Hatsumi Mori
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, 277-8581, Japan.
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Ito K, Nakamura K, Yoshida K. Synthesis of [1]Benzothieno[3,2-b][1]benzothiophenes through Iodine-Mediated Sulfur Insertion Reaction. Chemistry 2024; 30:e202400220. [PMID: 38320966 DOI: 10.1002/chem.202400220] [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: 01/18/2024] [Revised: 02/05/2024] [Accepted: 02/06/2024] [Indexed: 02/08/2024]
Abstract
[1]Benzothieno[3,2-b][1]benzothiophenes (BTBTs) are important molecules that have been extensively studied as high-performance organic field-effect transistors (OFETs). Therefore, it is important to develop a simple synthetic method for these molecules. In this paper, a synthetic method to obtain the BTBTs from 2-arylbenzo[b]thiophenes and elemental sulfur, in which two C-S bonds are formed at once, is described. In this method, molecular iodine plays a very important role as an additive. The role of iodine is discussed in the presumed reaction pathways.
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Affiliation(s)
- Kazuki Ito
- Department of Chemistry, Graduate School of Science, Chiba University, Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan
| | - Kohei Nakamura
- Department of Chemistry, Graduate School of Science, Chiba University, Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan
| | - Kazuhiro Yoshida
- Department of Chemistry, Graduate School of Science, Chiba University, Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan
- Department of Quantum Life Science, Graduate School of Science, Chiba University, Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan
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6
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Hata S, Ihara S, Saito H, Murayama M. In-situ heating-and-electron tomography for materials research: from 3D (in-situ 2D) to 4D (in-situ 3D). Microscopy (Oxf) 2024; 73:133-144. [PMID: 38462986 PMCID: PMC11000667 DOI: 10.1093/jmicro/dfae008] [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: 08/16/2023] [Revised: 12/06/2023] [Accepted: 02/07/2024] [Indexed: 03/12/2024] Open
Abstract
In-situ observation has expanded the application of transmission electron microscopy (TEM) and has made a significant contribution to materials research and development for energy, biomedical, quantum, etc. Recent technological developments related to in-situ TEM have empowered the incorporation of three-dimensional observation, which was previously considered incompatible. In this review article, we take up heating as the most commonly used external stimulus for in-situ TEM observation and overview recent in-situ TEM studies. Then, we focus on the electron tomography (ET) and in-situ heating combined observation by introducing the authors' recent research as an example. Assuming that in-situ heating observation is expanded from two dimensions to three dimensions using a conventional TEM apparatus and a commercially available in-situ heating specimen holder, the following in-situ heating-and-ET observation procedure is proposed: (i) use a rapid heating-and-cooling function of a micro-electro-mechanical system holder; (ii) heat and cool the specimen intermittently and (iii) acquire a tilt-series dataset when the specimen heating is stopped. This procedure is not too technically challenging and can have a wide range of applications. Essential technical points for a successful 4D (space and time) observation will be discussed through reviewing the authors' example application.
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Affiliation(s)
- Satoshi Hata
- Faculty of Engineering Sciences, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
- The Ultramicroscopy Research Center, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Shiro Ihara
- Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
| | - Hikaru Saito
- Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
- Pan-Omics Data-Driven Research Innovation Center, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
| | - Mitsuhiro Murayama
- Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
- Department of Materials Science and Engineering, Virginia Tech, 445 Old Turner St., Blacksburg, VA 24060, USA
- Reactor Materials and Mechanical Design Group, Energy and Environmental Directorate, Pacific Northwest National Laboratory, PO Box 999, Richland, WA 99352, USA
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7
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Arimura S, Matsumoto I, Sekiya R, Haino T. Intermediate Color Emission via Nanographenes with Organic Fluorophores. Angew Chem Int Ed Engl 2024; 63:e202315508. [PMID: 38191241 DOI: 10.1002/anie.202315508] [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: 10/14/2023] [Revised: 12/19/2023] [Accepted: 01/05/2024] [Indexed: 01/10/2024]
Abstract
Photoluminescence (PL) color can be tuned by mixing fluorophores emitting the three primary colors in an appropriate ratio. When color tuning is achieved on a single substrate, we can simplify device structures. We demonstrated that nanographenes (NGs), which are graphene fragments with a size of tens of nanometers, could be utilized as carriers of fluorophores. The addition of red- and blue-light-emitting fluorophores on the edge successfully reproduced the purple light. The relative PL intensities of the fluorophores could be regulated by the excitation wavelength, enabling multicolor emission between blue and red light. Owing to the triphenylamine units of the fluorophores, the NGs showed PL enhancement due to aggregation. This characteristic was valuable for the fabrication of solid polymer materials. Specifically, the functionalized NGs can be dispersed into polyvinylidene difluoride. The resultant polymer films emitted red, blue, and purple color. Our study demonstrated the potential applicability of NGs for fluorophore carriers capable of reproducing intermediate colors of light.
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Affiliation(s)
- Saki Arimura
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Ikuya Matsumoto
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Ryo Sekiya
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
- International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan
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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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Kawai K, Ando Y, Okubo M. Machine Learning-Assisted Survey on Charge Storage of MXenes in Aqueous Electrolytes. Small Methods 2024:e2400062. [PMID: 38530036 DOI: 10.1002/smtd.202400062] [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: 01/12/2024] [Revised: 03/07/2024] [Indexed: 03/27/2024]
Abstract
Pseudocapacitance is capable of both high power and energy densities owing to its fast chemical adsorption with substantial charge transfer. 2D transition-metal carbides/nitrides (MXenes) are an emerging class of pseudocapacitive electrode materials. However, the factors that dominate the physical and chemical properties of MXenes are intercorrelated with each other, giving rise to challenges in the quantitative assessment of their discriminating importance. In this perspective, literature data on the specific capacitance of MXene electrodes in aqueous electrolytes is comprehensively surveyed and analyzed using machine-learning techniques. The specific capacitance of MXene electrodes shows strong dependency on their interlayer spacing, where confined H2O in the interlayer space should play a key role in the charge storage mechanism. The electrochemical behavior of MXene electrodes is overviewed based on atomistic insights obtained from data-driven approaches.
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Affiliation(s)
- Kosuke Kawai
- Department of Electrical Engineering and Bioscience, School of Advanced Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Yasunobu Ando
- Department of Electrical Engineering and Bioscience, School of Advanced Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, 169-8555, Japan
- National Institute of Advanced Industrial Science and Technology (AIST), Umezono 1-1-1, Tsukuba, Ibaraki, 305-8568, Japan
| | - Masashi Okubo
- Department of Electrical Engineering and Bioscience, School of Advanced Science and Engineering, Waseda University, Shinjuku-ku, Tokyo, 169-8555, Japan
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10
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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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11
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Okuda A, Furuyama T, Sakai T, Machida M, Yoshida H. Selective Formation of Cu Active Sites with Different Coordination States on Pseudospinel CuAl 2O 4 and Their NO Reduction Catalysis. ACS Omega 2024; 9:11950-11957. [PMID: 38496955 PMCID: PMC10938440 DOI: 10.1021/acsomega.3c09704] [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: 12/05/2023] [Revised: 02/14/2024] [Accepted: 02/21/2024] [Indexed: 03/19/2024]
Abstract
In the spinel framework, copper (Cu) in two distinct coordination states exhibits catalytic activity for NO reduction through different mechanisms. However, detailed exploration of their respective catalytic properties, such as the redox behavior of Cu and substrate molecule adsorption, has been challenging due to difficulties in their separate formation. In this study, we present the controlled formation of pseudospinel CuAl2O4, containing exclusively tetrahedrally or octahedrally coordinated Cu, achieved by manipulating aging temperature and O2 concentration. Through these materials, we observed that in the CO-NO reaction, the step primarily determining the rate differs: NO reduction dominates with octahedrally coordinated Cu, whereas carbon monoxide (CO) oxidation is prominent with tetrahedrally coordinated Cu. The lower coordination number of Cu significantly benefits NO reduction but negatively impacts the CO-NO reaction, albeit positively influencing NO reduction in three-way catalytic reactions.
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Affiliation(s)
- Aoi Okuda
- Division
of Frontier Engineering, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-Machi, Kanazawa 920-1192, Japan
| | - Taniyuki Furuyama
- Nanomaterials
Research Institute, Kanazawa University, Kakuma-Machi, Kanazawa 920-1192, Japan
| | - Toshiaki Sakai
- Engineering
and Technology Department, Kanazawa University, Kakuma-Machi, Kanazawa 920-1192, Japan
| | - Masato Machida
- Division
of Materials Science and Chemistry, Faculty of Advanced Science and
Technology, Kumamoto University, 2-39-1 Kurokami, Chuo, Kumamoto 860-8555, Japan
| | - Hiroshi Yoshida
- Faculty
of Frontier Engineering, Institute of Science and Engineering, Kanazawa University, Kakuma-Machi, Kanazawa 920-1192, Japan
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12
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Kawaguchi K, Sugawara N, Ito M, Kubo Y. Thermochromic Afterglow from Benzene-1,4-Diboronic Acid-Doped Co-crystals. Chemistry 2024; 30:e202303924. [PMID: 38179827 DOI: 10.1002/chem.202303924] [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: 11/25/2023] [Revised: 12/15/2023] [Accepted: 01/02/2024] [Indexed: 01/06/2024]
Abstract
The accurate thermosensing requires a minimum impact of autofluorescence and light scattering from the samples. In this study, we discovered that commercially available benzene-1,4-diboronic acid (BDBA) doped co-crystals with trimethylolpropane (TMP) exhibit excellent thermochromic dual phosphorescence properties over a wide temperature range from -132 to 40 °C, despite its simple structure that does not have any donor-acceptor linkage. The dual phosphorescence was consisted of monomeric benzene-1,4-diboronate (BDBA ester) and aggregation-stabilized species. With an increase in temperature, the emission intensity from the monomeric state significantly decreased, whereas that originating from the aggregated state remained almost constant owing to the difference in their thermal stabilities. Further investigation revealed that molecular distortions in singlet excited states enable efficient intersystem crossing, causing efficient phosphorescence from the monomeric state of BDBA ester.
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Affiliation(s)
- Kaede Kawaguchi
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji-shi, Tokyo, 192-0397, Japan
| | - Natsumi Sugawara
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji-shi, Tokyo, 192-0397, Japan
| | - Masato Ito
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji-shi, Tokyo, 192-0397, Japan
| | - Yuji Kubo
- Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji-shi, Tokyo, 192-0397, Japan
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13
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Sekiya R, Haino T. Application of Exciton Coupling for Characterization of Nanographene Edge. Chemphyschem 2024; 25:e202300740. [PMID: 38226791 DOI: 10.1002/cphc.202300740] [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: 10/11/2023] [Revised: 12/18/2023] [Accepted: 01/15/2024] [Indexed: 01/17/2024]
Abstract
The structural characterization of nonstoichiometric nanographene (NG)-organic hybrid materials is usually difficult. The number of substituents on the edge and their arrangements are frequently questioned but are difficult to answer. Since the number of functional groups is closely related to the distance between the nearest neighbors (dISD ), the extraction of dISD from spectroscopic data could provide important information on their structural characterization. We show that exciton coupling, which is a theoretical prediction of the absolute structures of discrete molecules, is a possible candidate to address this issue. The comparison of the calculated CD spectra of the chiral chromophores extracted from the model NG edge with the observed edge spectra indicated a dISD of ca. 8 Å; this corresponded to substitution on every other armchair edge. Furthermore, an up-up-down-down alternate orientation was found to be a possible edge structure. Although the procedure was limited to NGs carrying chiral substituents, our method could facilitate the detailed structural characterization of NG-organic hybrid materials.
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Affiliation(s)
- Ryo Sekiya
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526, Japan
- International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM2), Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan
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14
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Nishioka D, Shingaya Y, Tsuchiya T, Higuchi T, Terabe K. Few- and single-molecule reservoir computing experimentally demonstrated with surface-enhanced Raman scattering and ion gating. Sci Adv 2024; 10:eadk6438. [PMID: 38416821 PMCID: PMC10901377 DOI: 10.1126/sciadv.adk6438] [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: 09/02/2023] [Accepted: 01/23/2024] [Indexed: 03/01/2024]
Abstract
Molecule-based reservoir computing (RC) is promising for achieving low power consumption neuromorphic computing, although the information-processing capability of small numbers of molecules is not clear. Here, we report a few- and single-molecule RC that uses the molecular vibration dynamics in the para-mercaptobenzoic acid (pMBA) detected by surface-enhanced Raman scattering (SERS) with tungsten oxide nanorod/silver nanoparticles. The Raman signals of the pMBA molecules, adsorbed at the SERS active site of the nanorod, were reversibly perturbated by the application of voltage-induced local pH changes near the molecules, and then used to perform time-series analysis tasks. Despite the small number of molecules used, our system achieved good performance, including >95% accuracy in various nonlinear waveform transformations, 94.3% accuracy in solving a second-order nonlinear dynamic system, and a prediction error of 25.0 milligrams per deciliter in a 15-minute-ahead blood glucose level prediction. Our work provides a concept of few-molecular computing with practical computation capabilities.
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Affiliation(s)
- Daiki Nishioka
- Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Department of Applied Physics, Faculty of Science, Tokyo University of Science, 6-3-1 Niijuku, Katsushika, Tokyo 125-8585, Japan
| | - Yoshitaka Shingaya
- Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Takashi Tsuchiya
- Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Tohru Higuchi
- Department of Applied Physics, Faculty of Science, Tokyo University of Science, 6-3-1 Niijuku, Katsushika, Tokyo 125-8585, Japan
| | - Kazuya Terabe
- Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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15
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Oka M, Kozako R, Teranishi Y, Yamada Y, Miyake K, Fujimura T, Sasai R, Ikeue T, Iida H. Chiral Supramolecular Organogel Constructed Using Riboflavin and Melamine: Its Application in Photo-Catalyzed Colorimetric Chiral Sensing and Enantioselective Adsorption. Chemistry 2024; 30:e202303353. [PMID: 38012829 DOI: 10.1002/chem.202303353] [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: 10/13/2023] [Revised: 11/24/2023] [Accepted: 11/27/2023] [Indexed: 11/29/2023]
Abstract
The synthesis of a chiral supramolecular organogel via the hierarchical helical self-assembly of optically active riboflavin and melamine derivatives is described herein. Owing to the photocatalysis of riboflavin and the supramolecular chirality induced in the helically stacked riboflavin/melamine complex, the gel is observed to act as a light-stimulated chiral sensor of optically active alcohols by detecting the change in color from yellow to green. The gel also served as an efficient chiral adsorbent, enabling optical resolution of a racemic compound with high chiral recognition ability.
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Affiliation(s)
- Marina Oka
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| | - Ryo Kozako
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| | - Yuta Teranishi
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| | - Yuta Yamada
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| | - Kazuhiro Miyake
- Center for Material Research Platform, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara, 630-0192, Japan
| | - Takuya Fujimura
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| | - Ryo Sasai
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| | - Takahisa Ikeue
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
| | - Hiroki Iida
- Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060 Nishikawatsu, Matsue, 690-8504, Japan
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16
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Kojima Y, Tanaka M, Sasaki M, Ozeki K, Shimura T, Kubota E, Kataoka H. Induction of ferroptosis by photodynamic therapy and enhancement of antitumor effect with ferroptosis inducers. J Gastroenterol 2024; 59:81-94. [PMID: 37947872 DOI: 10.1007/s00535-023-02054-y] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 10/19/2023] [Indexed: 11/12/2023]
Abstract
BACKGROUND Photodynamic therapy (PDT) is an effective tumor treatment that involves the administration of a photosensitizer to generate cytotoxic 1O2 [reactive oxygen species (ROS)] from molecular oxygen that is produced from energy absorption following tumor irradiation at specific wavelengths. Ferroptosis is induced by the disruption of the glutathione peroxidase 4 (GPX4) antioxidant system, leading to lipid peroxidation. We hypothesized that talaporfin sodium-photodynamic therapy (TS-PDT)-generated ROS would lead to ferroptosis via accumulation of lipid peroxidation. METHODS Cell viability assay in TS-PDT-treated cells in combination with a ferroptosis inhibitor (ferrostatin-1: Fer-1) or ferroptosis inducers (imidazole ketone erastin: IKE, Ras-selective lethal 3: RSL3) was performed. Accumulation of lipid peroxidation, GPX4 antioxidant system and cystine/glutamate antiporter (system xc-) activity in TS-PDT-treated cells was investigated. In xenograft mice, the antitumor effect of TS-PDT in combination with ferroptosis inducers (IKE or sorafenib) was examined. RESULTS TS-PDT-induced cell death was partly suppressed by Fer-1 and accompanied by lipid peroxidation. TS-PDT combined with IKE or RSL3 enhanced the induction of cell death. TS-PDT inhibited cystine uptake activity via system xc-. In vivo, the combination of TS-PDT and ferroptosis inducers (IKE or sorafenib) reduced tumor volume. CONCLUSION This study found that the mechanism underlying TS-PDT-induced ferroptosis constitutes direct lipid peroxidation by the generated ROS, and the inhibition of system xc-, and that the combination of a ferroptosis inducer with TS-PDT enhances the antitumor effect of TS-PDT. Our findings suggest that ferroptosis-inducing therapies combined with PDT may benefit cancer patients.
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Affiliation(s)
- Yuki Kojima
- Department of Gastroenterology and Metabolism, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-Cho, Mizuho-Ku, Nagoya, 467-8601, Japan
| | - Mamoru Tanaka
- Department of Gastroenterology and Metabolism, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-Cho, Mizuho-Ku, Nagoya, 467-8601, Japan.
| | - Makiko Sasaki
- Department of Gastroenterology and Metabolism, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-Cho, Mizuho-Ku, Nagoya, 467-8601, Japan
| | - Keiji Ozeki
- Department of Gastroenterology and Metabolism, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-Cho, Mizuho-Ku, Nagoya, 467-8601, Japan
| | - Takaya Shimura
- Department of Gastroenterology and Metabolism, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-Cho, Mizuho-Ku, Nagoya, 467-8601, Japan
| | - Eiji Kubota
- Department of Gastroenterology and Metabolism, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-Cho, Mizuho-Ku, Nagoya, 467-8601, Japan
| | - Hiromi Kataoka
- Department of Gastroenterology and Metabolism, Nagoya City University Graduate School of Medical Sciences, 1 Kawasumi, Mizuho-Cho, Mizuho-Ku, Nagoya, 467-8601, Japan
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17
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Kanzaki C, Yoneda H, Nomura S, Maeda T, Numata M. Correction: Ionic supramolecular polymerization of water-soluble porphyrins: balancing ionic attraction and steric repulsion to govern stacking. RSC Adv 2024; 14:4632. [PMID: 38318607 PMCID: PMC10839549 DOI: 10.1039/d4ra90010c] [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: 01/29/2024] [Accepted: 01/29/2024] [Indexed: 02/07/2024] Open
Abstract
[This corrects the article DOI: 10.1039/D2RA05542B.].
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Affiliation(s)
- Chisako Kanzaki
- Department of Biomolecular Chemistry, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University Shimogamo, Sakyo-ku Kyoto 606-8522 Japan +81-75-703-5132
| | - Hiroshi Yoneda
- Department of Biomolecular Chemistry, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University Shimogamo, Sakyo-ku Kyoto 606-8522 Japan +81-75-703-5132
| | - Shota Nomura
- Department of Biomolecular Chemistry, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University Shimogamo, Sakyo-ku Kyoto 606-8522 Japan +81-75-703-5132
| | - Takato Maeda
- Department of Biomolecular Chemistry, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University Shimogamo, Sakyo-ku Kyoto 606-8522 Japan +81-75-703-5132
| | - Munenori Numata
- Department of Biomolecular Chemistry, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University Shimogamo, Sakyo-ku Kyoto 606-8522 Japan +81-75-703-5132
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18
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Mihara T, Nozaki K, Kowaka Y, Jiang M, Yamashita K, Miura H, Ohara S. Enhanced Photocatalysis of Electrically Polarized Titania Nanosheets. Nanomaterials (Basel) 2024; 14:171. [PMID: 38251135 PMCID: PMC10818834 DOI: 10.3390/nano14020171] [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: 12/01/2023] [Revised: 01/05/2024] [Accepted: 01/05/2024] [Indexed: 01/23/2024]
Abstract
Titania (TiO2) nanosheets are crystals with controlled, highly ordered structures that improve the functionality of conventional TiO2 nanoparticles. Various surface modification methods have been studied to enhance the effectiveness of these materials as photocatalysts. Surface modifications using electrical polarization have attracted considerable attention in recent years because they can improve the function of titania without changing its composition. However, the combination of facet engineering and electrical polarization has not been shown to improve the functionality of TiO2 nanosheets. In the present study, the dye-degradation performance of polarized TiO2 nanosheets was evaluated. TiO2 nanosheets with a F/Ti ratio of 0.3 were synthesized via a hydrothermal method. The crystal morphology and structure were evaluated using transmission electron microscopy and X-ray diffraction. Then, electrical polarization was performed under a DC electric field of 300 V at 300 °C. The polarized material was evaluated using thermally stimulated current measurements. A dye-degradation assay was performed using a methylene blue solution under ultraviolet irradiation. The polarized TiO2 nanosheets exhibited a dense surface charge and accelerated decolorization. These results indicate that electrical polarization can be used to enhance the photocatalytic activity of TiO2.
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Grants
- 20K10049 Ministry of Education, Culture, Sports, Science, and Technology of Japan
- 20K09990 Ministry of Education, Culture, Sports, Science, and Technology of Japan
- 23K09269 Ministry of Education, Culture, Sports, Science, and Technology of Japan
- 0311049-A Iketani Science and Technology Foundation
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Affiliation(s)
- Tomoyuki Mihara
- Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo 113-8549, Japan; (T.M.); (Y.K.); (M.J.); (K.Y.); (H.M.)
| | - Kosuke Nozaki
- Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo 113-8549, Japan; (T.M.); (Y.K.); (M.J.); (K.Y.); (H.M.)
| | - Yasuyuki Kowaka
- Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo 113-8549, Japan; (T.M.); (Y.K.); (M.J.); (K.Y.); (H.M.)
| | - Mengtian Jiang
- Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo 113-8549, Japan; (T.M.); (Y.K.); (M.J.); (K.Y.); (H.M.)
| | - Kimihiro Yamashita
- Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo 113-8549, Japan; (T.M.); (Y.K.); (M.J.); (K.Y.); (H.M.)
| | - Hiroyuki Miura
- Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo 113-8549, Japan; (T.M.); (Y.K.); (M.J.); (K.Y.); (H.M.)
| | - Satoshi Ohara
- New Industry Creation Hatchery Center, Tohoku University, Aoba, Sendai 980-8579, Japan;
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19
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Mochizuki Y, Nagamatsu K, Koiso H, Isobe T, Nakajima A. Mechanism of Negative Thermal Expansion in Monoclinic Cu 2P 2O 7 from First Principles. J Phys Chem Lett 2024; 15:156-164. [PMID: 38149933 PMCID: PMC10788959 DOI: 10.1021/acs.jpclett.3c02856] [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: 10/12/2023] [Revised: 11/27/2023] [Accepted: 12/12/2023] [Indexed: 12/28/2023]
Abstract
Negative thermal expansion (NTE) materials generally have high-symmetry space groups, large average atomic volumes, and corner-sharing octahedral and tetrahedral coordination structures. By contrast, monoclinic α-Cu2P2O7, which has a small average atomic volume and edge-sharing structure, has been reported to exhibit NTE, the detailed mechanism of which is unclear. In this study, we investigate the A2B2O7 polymorphs and analyze the NTE behavior of α-Cu2P2O7 using first-principles lattice-dynamics calculations. From the polymorphism investigation in 20 A2B2O7 compounds using 6 representative crystal structures, small A and B cationic radii are found to stabilize the α-Cu2P2O7-type structure. We then analyze the NTE behavior of α-Cu2P2O7 using quasi-harmonic approximation. Our calculated thermal expansion coefficients and anisotropic atomic displacement parameters were in good agreement with those of the experimental reports at low temperatures. From the mode-Grüneisen parameter distribution plotted over the entire first-Brillouin zone, we found that the phonon contributing most significantly to NTE emerges not into the special points but between them. In this phonon mode, the O connecting two PO4 tetrahedra rotates, and the Cu and O vibrate perpendicular to the bottom of the CuO5 pyramidal unit, which folds the ac lattice plane. This vibration behavior can explain the experimentally reported anisotropic NTE behavior of α-Cu2P2O7. Our results demonstrate that the most negative mode-Grüneisen parameter contributing to NTE behavior is not always located on high-symmetry special points, indicating the importance of lattice vibration analyses for the entire first-Brillouin zone.
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Affiliation(s)
| | | | - Hiroki Koiso
- Department of Materials Science
and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo 152-8550, Japan
| | - Toshihiro Isobe
- Department of Materials Science
and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo 152-8550, Japan
| | - Akira Nakajima
- Department of Materials Science
and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo 152-8550, Japan
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20
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Isozaki K, Iseri K, Saito R, Ueda K, Nakamura M. Dual Catalysis of Gold Nanoclusters: Photocatalytic Cross-Dehydrogenative Coupling by Cooperation of Superatomic Core and Molecularly Modified Staples. Angew Chem Int Ed Engl 2024; 63:e202312135. [PMID: 37926682 DOI: 10.1002/anie.202312135] [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: 08/18/2023] [Revised: 10/25/2023] [Accepted: 11/03/2023] [Indexed: 11/07/2023]
Abstract
Thiolate-protected gold nanoclusters (AuNCs) have attracted significant attention as nano-catalysts, revealing a superatomic core and gold-thiolate staples as distinct structural units. Here, we demonstrate the unprecedented dual catalytic activity of thiolate-protected [Au25 (SR)18 ]- nanoclusters, involving both photosensitized 1 O2 generation by the Au13 superatomic core and catalytic carbon-carbon bond formation facilitated by Au2 (SR)3 staples. This synergistic combination of two different catalytic units enables efficient cross-dehydrogenative coupling of terminal alkynes and tertiary aliphatic amines to afford propargylamines in high yields of up to 93 %. Mixed-ligand AuNCs bearing both thiolate and alkynyl ligands revealed the intermediacy of the alkynyl-exchanged AuNCs toward both photosensitization and C-C bond-forming catalytic cycles. Density functional theory calculations also supported the intermediacy of the alkynyl-exchanged AuNCs. Thus, the use of ligand-protected metal nanoclusters has enabled the development of an exceptional multifunctional catalyst, wherein distinct nanocluster components facilitate cooperative photo- and chemo-catalysis.
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Affiliation(s)
- Katsuhiro Isozaki
- International Research Center for Elements Science, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Kenta Iseri
- International Research Center for Elements Science, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Ryohei Saito
- International Research Center for Elements Science, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Kyosuke Ueda
- International Research Center for Elements Science, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Masaharu Nakamura
- International Research Center for Elements Science, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
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21
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Egi Y, Kadokawa JI. Synthesis of Mixed Chitin Esters via Acylation of Chitin in Deep Eutectic Solvents. Molecules 2023; 28:8132. [PMID: 38138620 PMCID: PMC10745496 DOI: 10.3390/molecules28248132] [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: 11/29/2023] [Revised: 12/12/2023] [Accepted: 12/14/2023] [Indexed: 12/24/2023] Open
Abstract
The development of efficient derivatization methods of chitin, such as acylation, has been identified to confer new properties and functions to chitin. In this study, we investigate the synthesis of mixed chitin esters via the acylation of chitin in deep eutectic solvents (DESs) comprising 1-allyl-3-methylimidazolum chloride and 1,1,3,3-tetramethylguanidine based on a previous study that reported the development of efficient acylation of chitin in the DES to obtain single chitin esters. A stearoyl group was selected as the first substituent, which was combined with several bulky acyl and long oleoyl groups as the second substituents. After dissolution of chitin in the DES (2 wt%), the acylation reactions were conducted using stearoyl and the desired acyl chlorides for 1 h + 24 h at 100 °C in the resulting solutions. The IR and 1H NMR spectra of the isolated products confirmed the structures of mixed chitin esters with two different substituents. The substituent ratios in the derivatives, which were estimated via the 1H NMR analysis, were changed according to the feed ratios of two acyl chlorides.
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Affiliation(s)
| | - Jun-ichi Kadokawa
- Graduate School of Science and Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima 890-0065, Japan
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22
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Shibata K, Nishioka D, Namiki W, Tsuchiya T, Higuchi T, Terabe K. Redox-based ion-gating reservoir consisting of (104) oriented LiCoO 2 film, assisted by physical masking. Sci Rep 2023; 13:21060. [PMID: 38030675 PMCID: PMC10687094 DOI: 10.1038/s41598-023-48135-z] [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: 06/29/2023] [Accepted: 11/21/2023] [Indexed: 12/01/2023] Open
Abstract
Reservoir computing (RC) is a machine learning framework suitable for processing time series data, and is a computationally inexpensive and fast learning model. A physical reservoir is a hardware implementation of RC using a physical system, which is expected to become the social infrastructure of a data society that needs to process vast amounts of information. Ion-gating reservoirs (IGR) are compact and suitable for integration with various physical reservoirs, but the prediction accuracy and operating speed of redox-IGRs using WO3 as the channel are not sufficient due to irreversible Li+ trapping in the WO3 matrix during operation. Here, in order to enhance the computation performance of redox-IGRs, we developed a redox-based IGR using a (104) oriented LiCoO2 thin film with high electronic and ionic conductivity as a trap-free channel material. The subject IGR utilizes resistance change that is due to a redox reaction (LiCoO2 ⟺ Li1-xCoO2 + xLi+ + xe-) with the insertion and desertion of Li+. The prediction error in the subject IGR was reduced by 72% and the operation speed was increased by 4 times compared to the previously reported WO3, which changes are due to the nonlinear and reversible electrical response of LiCoO2 and the high dimensionality enhanced by a newly developed physical masking technique. This study has demonstrated the possibility of developing high-performance IGRs by utilizing materials with stronger nonlinearity and by increasing output dimensionality.
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Affiliation(s)
- Kaoru Shibata
- Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
- Department of Applied Physics, Faculty of Science, Tokyo University of Science, 6-3-1 Niijuku, Katsushika, Tokyo, 125-8585, Japan
| | - Daiki Nishioka
- Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
- Department of Applied Physics, Faculty of Science, Tokyo University of Science, 6-3-1 Niijuku, Katsushika, Tokyo, 125-8585, Japan
| | - Wataru Namiki
- Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
| | - Takashi Tsuchiya
- Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.
- Department of Applied Physics, Faculty of Science, Tokyo University of Science, 6-3-1 Niijuku, Katsushika, Tokyo, 125-8585, Japan.
| | - Tohru Higuchi
- Department of Applied Physics, Faculty of Science, Tokyo University of Science, 6-3-1 Niijuku, Katsushika, Tokyo, 125-8585, Japan
| | - Kazuya Terabe
- Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
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23
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Aoki K, Sugawara-Narutaki A, Takahashi R. Polymeric Sol-Gel Transition with the Diverging Correlation Length Verified by Small-Angle X-ray Scattering. J Phys Chem Lett 2023; 14:10396-10401. [PMID: 37955630 PMCID: PMC10683071 DOI: 10.1021/acs.jpclett.3c02631] [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: 09/18/2023] [Revised: 10/28/2023] [Accepted: 11/10/2023] [Indexed: 11/14/2023]
Abstract
Sol-gel transitions of polymers are pivotal phenomena in material science, yet the critical phenomenon of structure during gelation has remained unclear. Here, we investigated the sol-gel transition of a fluorous polymer, poly(vinylidene fluoride-co-hexafluoropropylene), in a blend of two ionic liquids. This system features a quite high amount of cross-linker and binding sites with ion-dipole interactions between the cation and C-F dipoles, thereby facilitating easy exchange of the cross-links. Changing the mixing ratio of the two ionic liquids enabled tuning the ion-dipole interactions and inducing sol-gel transition. Notably, the correlation length and molar mass, obtained by small-angle X-ray scattering, diverged at the gelation point. Moreover, the derived critical exponents (ν = 0.85 ± 0.05) aligns remarkably well with the prediction from percolation theory (ν = 0.88). To our knowledge, this is the first report on the evident divergence during polymeric gelation by small-angle scattering and the verification of the critical exponents of the percolation theory.
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Affiliation(s)
- Kota Aoki
- Department of Energy Engineering,
Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
| | - Ayae Sugawara-Narutaki
- Department of Energy Engineering,
Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
| | - Rintaro Takahashi
- Department of Energy Engineering,
Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
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24
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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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25
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Su SQ, Wu SQ, Kanegawa S, Yamamoto K, Sato O. Control of electronic polarization via charge ordering and electron transfer: electronic ferroelectrics and electronic pyroelectrics. Chem Sci 2023; 14:10631-10643. [PMID: 37829034 PMCID: PMC10566498 DOI: 10.1039/d3sc03432a] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [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: 07/05/2023] [Accepted: 08/31/2023] [Indexed: 10/14/2023] Open
Abstract
Ferroelectric, pyroelectric, and piezoelectric compounds whose electric polarization properties can be controlled by external stimuli such as electric field, temperature, and pressure have various applications, including ferroelectric memory materials, sensors, and thermal energy-conversion devices. Numerous polarization switching compounds, particularly molecular ferroelectrics and pyroelectrics, have been developed. In these materials, the polarization switching usually proceeds via ion displacement and reorientation of polar molecules, which are responsible for the change in ionic polarization and orientational polarization, respectively. Recently, the development of electronic ferroelectrics, in which the mechanism of polarization change is charge ordering and electron transfer, has attracted great attention. In this article, representative examples of electronic ferroelectrics are summarized, including (TMTTF)2X (TMTTF = tetramethyl-tetrathiafulvalene, X = anion), α-(BEDT-TTF)2I3 (BEDT-TTF = bis(ethylenedithio)-tetrathiafulvalene), TTF-CA (TTF = tetrathiafulvalene, CA = p-chloranil), and [(n-C3H7)4N][FeIIIFeII(dto)3] (dto = 1,2-dithiooxalate = C2O2S2). Furthermore, polarization switching materials using directional electron transfer in nonferroelectrics, the so-called electronic pyroelectrics, such as [(Cr(SS-cth))(Co(RR-cth))(μ-dhbq)](PF6)3 (dhbq = deprotonated 2,5-dihydroxy-1,4-benzoquinone, cth = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraaza-cyclotetradecane), are introduced. Future prospects are also discussed, particularly the development of new properties in polarization switching through the manipulation of electronic polarization in electronic ferroelectrics and electronic pyroelectrics by taking advantage of the inherent properties of electrons.
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Affiliation(s)
- Sheng-Qun Su
- Institute for Materials Chemistry and Engineering & IRCCS, Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
| | - Shu-Qi Wu
- Institute for Materials Chemistry and Engineering & IRCCS, Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
| | - Shinji Kanegawa
- Institute for Materials Chemistry and Engineering & IRCCS, Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
| | - Kaoru Yamamoto
- Department of Applied Physics, Okayama University of Science Okayama 700-0005 Japan
| | - Osamu Sato
- Institute for Materials Chemistry and Engineering & IRCCS, Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
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26
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Ikura R, Kajimoto K, Park J, Murayama S, Fujiwara Y, Osaki M, Suzuki T, Shirakawa H, Kitamura Y, Takahashi H, Ohashi Y, Obata S, Harada A, Ikemoto Y, Nishina Y, Uetsuji Y, Matsuba G, Takashima Y. Highly Stretchable Stress-Strain Sensor from Elastomer Nanocomposites with Movable Cross-links and Ketjenblack. ACS Polym Au 2023; 3:394-405. [PMID: 37841949 PMCID: PMC10571104 DOI: 10.1021/acspolymersau.3c00010] [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: 04/29/2023] [Revised: 08/30/2023] [Accepted: 08/31/2023] [Indexed: 10/17/2023]
Abstract
Practical applications like very thin stress-strain sensors require high strength, stretchability, and conductivity, simultaneously. One of the approaches is improving the toughness of the stress-strain sensing materials. Polymeric materials with movable cross-links in which the polymer chain penetrates the cavity of cyclodextrin (CD) demonstrate enhanced strength and stretchability, simultaneously. We designed two approaches that utilize elastomer nanocomposites with movable cross-links and carbon filler (ketjenblack, KB). One approach is mixing SC (a single movable cross-network material), a linear polymer (poly(ethyl acrylate), PEA), and KB to obtain their composite. The electrical resistance increases proportionally with tensile strain, leading to the application of this composite as a stress-strain sensor. The responses of this material are stable for over 100 loading and unloading cycles. The other approach is a composite made with KB and a movable cross-network elastomer for knitting dissimilar polymers (KP), where movable cross-links connect the CD-modified polystyrene (PSCD) and PEA. The obtained composite acts as a highly sensitive stress-strain sensor that exhibits an exponential increase in resistance with increasing tensile strain due to the polymer dethreading from the CD rings. The designed preparations of highly repeatable or highly responsive stress-strain sensors with good mechanical properties can help broaden their application in electrical devices.
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Affiliation(s)
- Ryohei Ikura
- Department
of Macromolecular Science, Graduate School of Science, Osaka University. 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
- Forefront
Research Center for Fundamental Sciences, Osaka University. 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
| | - Kota Kajimoto
- Department
of Macromolecular Science, Graduate School of Science, Osaka University. 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
| | - Junsu Park
- Department
of Macromolecular Science, Graduate School of Science, Osaka University. 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
- Forefront
Research Center for Fundamental Sciences, Osaka University. 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
| | - Shunsuke Murayama
- Graduate
School of Organic Materials Engineering, Yamagata University. 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
| | - Yusei Fujiwara
- Department
of Mechanical Engineering, Osaka Institute
of Technology.5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan
| | - Motofumi Osaki
- Department
of Macromolecular Science, Graduate School of Science, Osaka University. 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
- Forefront
Research Center for Fundamental Sciences, Osaka University. 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
| | - Tomohiro Suzuki
- Kanagawa
Technical Center, Yushiro Chemical Industry
Co., Ltd. 1580 Tabata, Samukawa-machi, Koza-gun, Kanagawa 253-0193, Japan
| | - Hidenori Shirakawa
- Kanagawa
Technical Center, Yushiro Chemical Industry
Co., Ltd. 1580 Tabata, Samukawa-machi, Koza-gun, Kanagawa 253-0193, Japan
| | - Yujiro Kitamura
- Kanagawa
Technical Center, Yushiro Chemical Industry
Co., Ltd. 1580 Tabata, Samukawa-machi, Koza-gun, Kanagawa 253-0193, Japan
| | - Hiroaki Takahashi
- Kanagawa
Technical Center, Yushiro Chemical Industry
Co., Ltd. 1580 Tabata, Samukawa-machi, Koza-gun, Kanagawa 253-0193, Japan
| | - Yasumasa Ohashi
- Kanagawa
Technical Center, Yushiro Chemical Industry
Co., Ltd. 1580 Tabata, Samukawa-machi, Koza-gun, Kanagawa 253-0193, Japan
| | - Seiji Obata
- Research
Core for Interdisciplinary Sciences, Okayama
University.3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Akira Harada
- SANKEN
(The Institute of Scientific and Industrial Research), Osaka University. 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
| | - Yuka Ikemoto
- Japan Synchrotron Radiation Research Institute. 1-1-1 Kouto, Sayo-gun, Hyogo 679-5198, Japan
| | - Yuta Nishina
- Research
Core for Interdisciplinary Sciences, Okayama
University.3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
- Graduate
School of Natural Science and Technology, Okayama University. 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan
| | - Yasutomo Uetsuji
- Department
of Mechanical Engineering, Osaka Institute
of Technology.5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan
| | - Go Matsuba
- Graduate
School of Organic Materials Engineering, Yamagata University. 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
| | - Yoshinori Takashima
- Department
of Macromolecular Science, Graduate School of Science, Osaka University. 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
- Forefront
Research Center for Fundamental Sciences, Osaka University. 1-1 Machikaneyama-cho, Toyonaka, Osaka 560-0043, Japan
- Innovative
Catalysis Science Division, Institute for Open and Transdisciplinary
Research Initiatives (ICS-OTRI), Osaka University. 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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27
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Narita H, Ishizuka J, Kan D, Shimakawa Y, Yanase Y, Ono T. Magnetization Control of Zero-Field Intrinsic Superconducting Diode Effect. Adv Mater 2023; 35:e2304083. [PMID: 37410358 DOI: 10.1002/adma.202304083] [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: 05/02/2023] [Revised: 06/28/2023] [Accepted: 07/03/2023] [Indexed: 07/07/2023]
Abstract
The superconducting diode effect (SDE), which causes a superconducting state in one direction and a normal-conducting state in another, has significant potential for developing ultralow power consumption circuits and non-volatile memory. However, the practical control of the SDE necessities the precise tuning of current, temperature, magnetic field, or magnetism. Therefore, the mechanisms of the SDE must be understood to develop novel materials and devices capable of realizing the SDE under more controlled and robust conditions. This study demonstrates an intrinsic zero-field SDE with an efficiency of up to 40% in Fe/Pt-inserted non-centrosymmetric Nb/V/Ta superconducting artificial superlattices. The polarity and magnitude of the zero-field SDE are controllable by the direction of magnetization, indicating that the effective exchange field acts on Cooper pairs. Furthermore, the first-principles calculation indicates that the SDE can be enhanced by an asymmetric configuration of proximity induced magnetic moments in superconducting layers, which induces a magnetic toroidal moment. This study has important implications regarding the development of novel materials and devices that can effectively control the SDE. Moreover, the magnetization control of the SDE is expected to aid in the designing of superconducting quantum devices and establishing a material platform for topological superconductors.
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Affiliation(s)
- Hideki Narita
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
| | - Jun Ishizuka
- Faculty of Engineering, Niigata University, Ikarashi, Niigata, 950-2181, Japan
| | - Daisuke Kan
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
- Center for Spintronics Research Network, Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan
| | - Yuichi Shimakawa
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
- Center for Spintronics Research Network, Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan
| | - Youichi Yanase
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
- Institute for Molecular Science, Okazaki, 444-0867, Japan
| | - Teruo Ono
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
- Center for Spintronics Research Network, Institute for Chemical Research, Kyoto University, Uji, Kyoto, 611-0011, Japan
- Center for Spintronics Research Network, Graduate School of Engineering Science, Osaka University, Toyonaka, 560-0043, Japan
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28
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Meng F, Arai N. The Relationship between Nanostructured Bio-Inspired Material Surfaces and the Free Energy Barrier Using Coarse-Grained Molecular Dynamics. Biomimetics (Basel) 2023; 8:453. [PMID: 37887584 PMCID: PMC10604192 DOI: 10.3390/biomimetics8060453] [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: 07/25/2023] [Revised: 09/19/2023] [Accepted: 09/22/2023] [Indexed: 10/28/2023] Open
Abstract
Bio-inspired (biomimetic) materials, which are inspired by living organisms, offer exciting opportunities for the development of advanced functionalities. Among them, bio-inspired superhydrophobic surfaces have attracted considerable interest due to their potential applications in self-cleaning surfaces and reducing fluid resistance. Although the mechanism of superhydrophobicity is understood to be the free energy barrier between the Cassie and Wenzel states, the solid-surface technology to control the free energy barrier is still unclear. Therefore, previous studies have fabricated solid surfaces with desired properties through trial and error by measuring contact angles. In contrast, our study directly evaluates the free energy barrier using molecular simulations and attempts to relate it to solid-surface parameters. Through a series of simulations, we explore the behavior of water droplets on surfaces with varying values of surface pillar spacing and surface pillar height. The results show that the free energy barrier increases significantly as the pillar spacing decreases and/or as the pillar height increases. Our study goes beyond traditional approaches by exploring the relationship between free energy barriers, surface parameters, and hydrophobicity, providing a more direct and quantified method to evaluate surface hydrophobicity. This knowledge contributes significantly to material design by providing valuable insights into the relationship between surface parameters, free energy barriers, and hydrophilicity/hydrophobicity.
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Affiliation(s)
| | - Noriyoshi Arai
- Department of Mechanical Engineering, Keio University, Yokohama 2238522, Japan;
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29
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Imai T, Sakamaki D, Aoyagi S, Amaya T. Intramolecular Electron Transfer in Multi-Redox Systems Based on Cyclic [3]Spirobifluorenylene Compound. Chemistry 2023:e202302670. [PMID: 37740416 DOI: 10.1002/chem.202302670] [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: 08/15/2023] [Revised: 09/22/2023] [Accepted: 09/22/2023] [Indexed: 09/24/2023]
Abstract
Cyclic [3]spirobifluorenylene with bulky alkyl groups at the ends (1) was designed and synthesized to investigate the electron transfer phenomena in a π-conjugated system including orthogonal π-conjugated chains. The three bifluorenyl units in 1 are conjugated to each other via spiro-conjugation, resulting in the splitting of the HOMO levels to a small extent. Therefore, the SOMO-HOMO gap of the radical cation species is small, which is considered to allow the facile intramolecular electron transfer. The electronic properties of 1 and its partial structures were characterized by absorption and fluorescence measurements and electrochemical analysis. From the electrochemical oxidation, the interchain Coulombic repulsion was observed. In the TD-DFT calculations for the radical cation species of 1, the geometry-featured interchain electronic transitions were visualized by NTO calculations. The radical cation species of 1 generated by chemical oxidation with SbCl5 exhibited a broadened and lower-energy NIR absorption band exceeding 2000 nm. Considering the results of the TD-DFT calculations, the NIR band of the radical cation of 1 was attributed to the intramolecular electron transfer processes among the bifluorenyl units in the macrocycle. ESR experiments also indicated the delocalization of a spin of 1⋅+ in the whole molecule via hole hopping in the ESR time scale at room temperature. This work demonstrates the usefulness of spiro-conjugation as a bridging unit in molecular wires to facilitate smooth electron transfer.
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Affiliation(s)
- Tomoya Imai
- Department of Information and Basic Science, Graduate School of Science, Nagoya City University, 1 Yamanohata, Mizuho-cho, Mizuho-ku, Nagoya, Aichi, 467-8501, Japan
| | - Daisuke Sakamaki
- Department of Chemistry, Graduate School of Science, Osaka Metropolitan University Naka-ku, Sakai, Osaka, 599-8531, Japan
| | - Shinobu Aoyagi
- Department of Information and Basic Science, Graduate School of Science, Nagoya City University, 1 Yamanohata, Mizuho-cho, Mizuho-ku, Nagoya, Aichi, 467-8501, Japan
| | - Toru Amaya
- Department of Information and Basic Science, Graduate School of Science, Nagoya City University, 1 Yamanohata, Mizuho-cho, Mizuho-ku, Nagoya, Aichi, 467-8501, Japan
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30
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Ota T, Montagna V, Higuchi Y, Kato T, Tanaka M, Sardon H, Fukushima K. Organocatalyzed ring-opening reactions of γ-carbonyl-substituted ε-caprolactones. RSC Adv 2023; 13:27764-27771. [PMID: 37731833 PMCID: PMC10507672 DOI: 10.1039/d3ra01025b] [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: 02/14/2023] [Accepted: 09/12/2023] [Indexed: 09/22/2023] Open
Abstract
Side-chain-functionalized aliphatic polyesters are promising as functional biodegradable polymers. We have investigated ring-opening reactions of γ-carbonyl-substituted ε-caprolactones (gCCLs) to obtain poly(ε-caprolactone) (PCL) analogues. Organic catalysts and Sn(Oct)2 often used for the ring-opening polymerization (ROP) of ε-caprolactone (CL) have been explored to find the conditions for the formation of polymeric products of gCCLs. We confirmed the consumption of gCCLs in all catalyzed reactions. However, chain propagation hardly occurs, as the propagating species are preferentially transformed to α-substituted five-membered lactones when the substituents are linked by ester or not sterically hindered. Intramolecular cyclization to form thermodynamically stable five-membered lactones releases alcohols and amines, serving as nucleophiles for the subsequent ring opening of other gCCLs. Thus, apparent chain reactions are realized for continuous consumption of gCCLs. The reaction preference remains unchanged independent of the catalysts, although the reactions of the amide-linked gCCLs by acidic catalysts are slightly mitigated. Finally, copolymerization of CL and a gCCL catalyzed by diphenyl phosphate has been investigated, which enables the chain propagation reaction to yield the linear oligomers of PCL analogues containing up to 16 mol% of gCCL units. This study contributes to understanding the chemistry of ring-opening reactions of substituted lactones for designing functional degradable polymers.
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Affiliation(s)
- Takayuki Ota
- Graduate School of Science and Engineering, Yamagata University Yamagata 992-8510 Japan
| | - Valentina Montagna
- Graduate School of Organic Materials Science, Yamagata University 4-3-16 Jonan Yonezawa Yamagata 992-8510 Japan
- POLYMAT, University of the Basque Country UPV/EHU, Joxe Mari Korta Center Avda. Tolosa 72 20018 Donostia-San Sebastian Spain
| | - Yuji Higuchi
- Research Institute for Information Technology, Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
| | - Takashi Kato
- Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan
| | - Masaru Tanaka
- Institute for Materials Chemistry and Engineering, Kyushu University 744 Motooka, Nishi-ku Fukuoka 819-0395 Japan
| | - Haritz Sardon
- POLYMAT, University of the Basque Country UPV/EHU, Joxe Mari Korta Center Avda. Tolosa 72 20018 Donostia-San Sebastian Spain
| | - Kazuki Fukushima
- Graduate School of Organic Materials Science, Yamagata University 4-3-16 Jonan Yonezawa Yamagata 992-8510 Japan
- Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan
- Japan Science and Technology Agency (JST), PRESTO 4-1-8 Honcho, Kawaguchi Saitama 332-0012 Japan
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Yoon JY, Zhang P, Chou CT, Takeuchi Y, Uchimura T, Hou JT, Han J, Kanai S, Ohno H, Fukami S, Liu L. Handedness anomaly in a non-collinear antiferromagnet under spin-orbit torque. Nat Mater 2023; 22:1106-1113. [PMID: 37537356 DOI: 10.1038/s41563-023-01620-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Accepted: 06/23/2023] [Indexed: 08/05/2023]
Abstract
Non-collinear antiferromagnets are an emerging family of spintronic materials because they not only possess the general advantages of antiferromagnets but also enable more advanced functionalities. Recently, in an intriguing non-collinear antiferromagnet Mn3Sn, where the octupole moment is defined as the collective magnetic order parameter, spin-orbit torque (SOT) switching has been achieved in seemingly the same protocol as in ferromagnets. Nevertheless, it is fundamentally important to explore the unknown octupole moment dynamics and contrast it with the magnetization vector of ferromagnets. Here we report a handedness anomaly in the SOT-driven dynamics of Mn3Sn: when spin current is injected, the octupole moment rotates in the opposite direction to the individual moments, leading to a SOT switching polarity distinct from ferromagnets. By using second-harmonic and d.c. magnetometry, we track the SOT effect onto the octupole moment during its rotation and reveal that the handedness anomaly stems from the interactions between the injected spin and the unique chiral-spin structure of Mn3Sn. We further establish the torque balancing equation of the magnetic octupole moment and quantify the SOT efficiency. Our finding provides a guideline for understanding and implementing the electrical manipulation of non-collinear antiferromagnets, which in nature differs from the well-established collinear magnets.
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Affiliation(s)
- Ju-Young Yoon
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai, Japan
- Graduate School of Engineering, Tohoku University, Sendai, Japan
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Pengxiang Zhang
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Chung-Tao Chou
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, USA
- Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Yutaro Takeuchi
- WPI-Advanced Institute for Materials Research, Tohoku University, Sendai, Japan
| | - Tomohiro Uchimura
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai, Japan
- Graduate School of Engineering, Tohoku University, Sendai, Japan
| | - Justin T Hou
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Jiahao Han
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai, Japan.
| | - Shun Kanai
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai, Japan
- Graduate School of Engineering, Tohoku University, Sendai, Japan
- WPI-Advanced Institute for Materials Research, Tohoku University, Sendai, Japan
- Center for Science and Innovation in Spintronics, Tohoku University, Sendai, Japan
- Division for the Establishment of Frontier Sciences of Organization for Advanced Studies, Tohoku University, Sendai, Japan
| | - Hideo Ohno
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai, Japan
- Graduate School of Engineering, Tohoku University, Sendai, Japan
- WPI-Advanced Institute for Materials Research, Tohoku University, Sendai, Japan
- Center for Science and Innovation in Spintronics, Tohoku University, Sendai, Japan
- Center for Innovative Integrated Electronic Systems, Tohoku University, Sendai, Japan
| | - Shunsuke Fukami
- Laboratory for Nanoelectronics and Spintronics, Research Institute of Electrical Communication, Tohoku University, Sendai, Japan.
- Graduate School of Engineering, Tohoku University, Sendai, Japan.
- WPI-Advanced Institute for Materials Research, Tohoku University, Sendai, Japan.
- Center for Science and Innovation in Spintronics, Tohoku University, Sendai, Japan.
- Center for Innovative Integrated Electronic Systems, Tohoku University, Sendai, Japan.
- Inamori Research Institute for Science, Kyoto, Japan.
| | - Luqiao Liu
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, USA.
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Minami Y, Inagaki Y, Tsuyuki T, Sato K, Nakajima Y. Hydroxylation-Depolymerization of Oxyphenylene-Based Super Engineering Plastics To Regenerate Arenols. JACS Au 2023; 3:2323-2332. [PMID: 37654597 PMCID: PMC10466334 DOI: 10.1021/jacsau.3c00357] [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: 07/06/2023] [Revised: 07/20/2023] [Accepted: 07/21/2023] [Indexed: 09/02/2023]
Abstract
Super engineering plastics, high-performance thermoplastic resins, show high thermal stability and mechanical strength as well as chemical resistance. On the other hand, chemical recycling for these plastics has not been developed due to their stability. This study describes depolymerization of oxyphenylene super engineering plastics via carbon-oxygen main chain cleaving hydroxylation reaction with an alkali hydroxide nucleophile. This method is conducted with cesium hydroxide as a hydroxy source and calcium hydride as a dehydration agent in 1,3-dimethyl-2-imidazolidinone, which provides hydroxylated monomers effectively. In the case of polysulfone, both 4,4'-sulfonyldiphenol (bisphenol S) and 4,4'-(propane-2,2-diyl)diphenol (bisphenol A) were obtained in high yields. Other super engineering plastics such as polyethersulfone, polyphenylsulfone, and polyetheretherketone were also applicable to this depolymerization.
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Affiliation(s)
- Yasunori Minami
- Interdisciplinary
Research Center for Catalytic Chemistry (IRC3), National Institute of Advanced Industrial Science and Technology
(AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
- PRESTO,
Japan Science and Technology Agency (JST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Yuuki Inagaki
- Interdisciplinary
Research Center for Catalytic Chemistry (IRC3), National Institute of Advanced Industrial Science and Technology
(AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
- Yoshimoto
Kogyo Holdings, 5-18-21
Shinjuku, Shinjuku-ku, Tokyo 160-0022, Japan
| | - Tomoo Tsuyuki
- Interdisciplinary
Research Center for Catalytic Chemistry (IRC3), National Institute of Advanced Industrial Science and Technology
(AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Kazuhiko Sato
- Interdisciplinary
Research Center for Catalytic Chemistry (IRC3), National Institute of Advanced Industrial Science and Technology
(AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Yumiko Nakajima
- Interdisciplinary
Research Center for Catalytic Chemistry (IRC3), National Institute of Advanced Industrial Science and Technology
(AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
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Park J, Shimizu Y, Zhou X, Ikura R, Matsuba G, Takashima Y. Water-Content-Dependent Switching of the Bending Behavior of Photoresponsive Hydrogels Composed of Hydrophilic Acrylamide-Based Main Chains and Hydrophobic Azobenzene. Gels 2023; 9:658. [PMID: 37623113 PMCID: PMC10453818 DOI: 10.3390/gels9080658] [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: 06/13/2023] [Revised: 08/07/2023] [Accepted: 08/12/2023] [Indexed: 08/26/2023] Open
Abstract
Photoresponsiveness is a promising characteristic of stimulus-responsive materials. Photoresponsiveness can be achieved by incorporating photoresponsive molecules into polymeric materials. In addition, multiple-stimuli-responsive materials have attracted scientists' interest. Among the numerous multiple-stimuli-responsive materials, moisture- and photoresponsive materials are the focus of this report. These stimuli-responsive materials responded to the stimuli synergistically or orthogonally. Unlike most stimulus-responsive materials utilizing moisture and light as stimuli, the materials studied herein switch their photoresponsiveness in the presence of moisture. Appropriate copolymers consisting of hydrophilic acrylamide-based monomers for the main chain and hydrophobic azobenzene moieties switched their bending behaviors at 6-9 wt% water contents. At water contents lower than 6 wt%, the polymeric materials bent away from the light source, while they bent toward the light source at water contents higher than 10 wt%. At a low water content, the bending behaviors can be described on the molecular scale. At a high water content, the bending behavior requires consideration of the phase scale, not only the molecular scale. By controlling the balance between hydrophilicity and hydrophobicity, the switching behavior was achieved. This switching behavior may inspire additional strategies for the application of polymeric material as actuators.
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Affiliation(s)
- Junsu Park
- Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka 560-0043, Osaka, Japan (R.I.)
- Forefront Research Center, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka 560-0043, Osaka, Japan
| | - Yuki Shimizu
- Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka 560-0043, Osaka, Japan (R.I.)
| | - Xin Zhou
- Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka 560-0043, Osaka, Japan (R.I.)
| | - Ryohei Ikura
- Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka 560-0043, Osaka, Japan (R.I.)
- Forefront Research Center, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka 560-0043, Osaka, Japan
| | - Go Matsuba
- Graduate School of Organic Materials Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa 992-8510, Yamagata, Japan;
| | - Yoshinori Takashima
- Department of Macromolecular Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka 560-0043, Osaka, Japan (R.I.)
- Forefront Research Center, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka 560-0043, Osaka, Japan
- Innovative Catalysis Science Division, Institute for Open and Transdisciplinary Research Initiatives (OTRI), Osaka University, 1-1 Yamadaoka, Suita 565-0871, Osaka, Japan
- Institute for Advanced Co-Creation Studies, Osaka University, 1-1 Yamadaoka, Suita 565-0871, Osaka, Japan
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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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Miyazaki S, Goushi K, Kitagawa Y, Hasegawa Y, Adachi C, Miyata K, Onda K. Highly efficient light harvesting of a Eu(iii) complex in a host-guest film by triplet sensitization. Chem Sci 2023; 14:6867-6875. [PMID: 37389253 PMCID: PMC10306081 DOI: 10.1039/d3sc01817b] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [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: 04/10/2023] [Accepted: 05/28/2023] [Indexed: 07/01/2023] Open
Abstract
Trivalent lanthanide complexes are attractive light emitters owing to their ideal high color purity. Sensitization using ligands with high absorption efficiency is a powerful approach to enhancing photoluminescence intensity. However, the development of antenna ligands that can be used for sensitization is limited due to difficulties in controlling the coordination structures of lanthanides. When compared to conventional luminescent Eu(iii) complexes, a system composed of triazine-based host molecules and Eu(hfa)3(TPPO)2 (hfa: hexafluoroacetylacetonato and TPPO: triphenylphosphine oxide) significantly increased total photoluminescence intensity. Energy transfer from the host molecules to the Eu(iii) ion occurs via triplet states over several molecules, according to time-resolved spectroscopic studies, with nearly 100% efficiency. Our discovery paves the way for efficient light harvesting of Eu(iii) complexes with simple fabrication using a solution process.
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Affiliation(s)
- Shiori Miyazaki
- Department of Chemistry, Kyushu University 744 Motooka, Nishi Fukuoka 819-0395 Japan
| | - Kenichi Goushi
- Center for Organic Photonics and Electronics Research (OPERA), Kyushu University 744 Motooka, Nishi Fukuoka 819-0395 Japan
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University 744 Motooka, Nishi Fukuoka 819-0395 Japan
| | - Yuichi Kitagawa
- Faculty of Engineering, Hokkaido University N13W8, Kita-ku Sapporo Hokkaido 060-8628 Japan
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University N21W10, Kita-ku Sapporo Hokkaido 001-0021 Japan
| | - Yasuchika Hasegawa
- Faculty of Engineering, Hokkaido University N13W8, Kita-ku Sapporo Hokkaido 060-8628 Japan
- Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University N21W10, Kita-ku Sapporo Hokkaido 001-0021 Japan
| | - Chihaya Adachi
- Center for Organic Photonics and Electronics Research (OPERA), Kyushu University 744 Motooka, Nishi Fukuoka 819-0395 Japan
- International Institute for Carbon Neutral Energy Research (I2CNER), Kyushu University 744 Motooka, Nishi Fukuoka 819-0395 Japan
| | - Kiyoshi Miyata
- Department of Chemistry, Kyushu University 744 Motooka, Nishi Fukuoka 819-0395 Japan
| | - Ken Onda
- Department of Chemistry, Kyushu University 744 Motooka, Nishi Fukuoka 819-0395 Japan
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Takatsuka S, Kubota T, Kurashina Y, Kurihara S, Hirabayashi M, Fujioka M, Okano HJ, Onoe H. Controlled release of adeno-associated virus from alginate hydrogel microbeads with enhanced sensitivity to ultrasound. Biotechnol Bioeng 2023. [PMID: 37366284 DOI: 10.1002/bit.28482] [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: 01/07/2023] [Revised: 06/10/2023] [Accepted: 06/14/2023] [Indexed: 06/28/2023]
Abstract
Adeno-associated virus (AAV)-based gene therapy holds promise as a fundamental treatment for genetic disorders. For clinical applications, it is necessary to control AAV release timing to avoid an immune response to AAV. Here we propose an ultrasound (US)-triggered on-demand AAV release system using alginate hydrogel microbeads (AHMs) with a release enhancer. By using a centrifuge-based microdroplet shooting device, the AHMs encapsulating AAV with tungsten microparticles (W-MPs) are fabricated. Since W-MPs work as release enhancers, the AHMs have high sensitivity to the US with localized variation in acoustic impedance for improving the release of AAV. Furthermore, AHMs were coated with poly-l-lysine (PLL) to adjust the release of AAV. By applying US to the AAV encapsulating AHMs with W-MPs, the AAV was released on demand, and gene transfection to cells by AAV was confirmed without loss of AAV activity. This proposed US-triggered AAV release system expands methodological possibilities in gene therapy.
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Affiliation(s)
- Shuhei Takatsuka
- School of Integrated Design Engineering, Graduate School of Science and Technology, Keio University, Yokohama, Japan
| | - Takeshi Kubota
- School of Integrated Design Engineering, Graduate School of Science and Technology, Keio University, Yokohama, Japan
| | - Yuta Kurashina
- Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, Yokohama, Japan
- Division of Advanced Mechanical Systems Engineering, Institute of Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan
| | - Sho Kurihara
- Department of Otorhinolaryngology, The Jikei University School of Medicine, Tokyo, Japan
- Division of Regenerative Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Motoki Hirabayashi
- Department of Otorhinolaryngology, The Jikei University School of Medicine, Tokyo, Japan
- Division of Regenerative Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Masato Fujioka
- Department of Molecular Genetics, Kitasato University School of Medicine, Sagamihara, Kanagawa, Japan
- Clinical and Translational Research Center, Keio University Hospital, Tokyo, Japan
- Department of Otorhinolaryngology, Head and Neck Surgery, Keio University School of Medicine, Tokyo, Japan
| | - Hirotaka James Okano
- Division of Regenerative Medicine, The Jikei University School of Medicine, Tokyo, Japan
| | - Hiroaki Onoe
- School of Integrated Design Engineering, Graduate School of Science and Technology, Keio University, Yokohama, Japan
- Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, Yokohama, Japan
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Hiasa S, Fujimori T, Aiki S, Ueda H, Tsuboi T, Kitaguchi T. Development of green fluorescent protein-based cAMP indicators for covering a wide range of cAMP concentrations. RSC Adv 2023; 13:15514-15520. [PMID: 37223420 PMCID: PMC10201545 DOI: 10.1039/d3ra01390a] [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: 03/01/2023] [Accepted: 05/12/2023] [Indexed: 05/25/2023] Open
Abstract
There is a wide range in the concentration of intracellular cyclic adenosine 3',5'-monophosphate (cAMP), which mediates specific effects as a second messenger in pathways affecting many physiological processes. Here, we developed green fluorescent cAMP indicators, named Green Falcan (Green fluorescent protein-based indicator visualizing cAMP dynamics) with various EC50 values (0.3, 1, 3, 10 μM) for covering the wide range of intracellular cAMP concentrations. The fluorescence intensity of Green Falcans increased in a cAMP dose-dependent manner, with a dynamic range of over 3-fold. Green Falcans showed a high specificity for cAMP over its structural analogues. When we expressed Green Falcans in HeLa cells, these indicators were applicable for visualization of cAMP dynamics in the low concentration range compared to the previously developed cAMP indicators, and visualized distinct kinetics of cAMP in various pathways with high spatiotemporal resolution in living cells. Furthermore, we demonstrated that Green Falcans are applicable to dual-color imaging with R-GECO, a red fluorescent Ca2+ indicator, in the cytoplasm and the nucleus. This study shows that Green Falcans open up a new avenue for understanding hierarchal and cooperative interactions with other molecules in various cAMP signaling pathways by multi-color imaging.
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Affiliation(s)
- Sohei Hiasa
- School of Life Science and Technology, Department of Life Science and Technology, Tokyo Institute of Technology 4259 Nagatsuta-cho, Midori-ku Yokohama-shi Kanagawa 226-8501 Japan
| | - Takeru Fujimori
- School of Life Science and Technology, Department of Life Science and Technology, Tokyo Institute of Technology 4259 Nagatsuta-cho, Midori-ku Yokohama-shi Kanagawa 226-8501 Japan
| | - Saki Aiki
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo 3-8-1 Komaba, Meguro-ku Tokyo 153-8902 Japan
| | - Hiroshi Ueda
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology 4259 Nagatsuta-cho, Midori-ku Yokohama-shi Kanagawa 226-8503 Japan
| | - Takashi Tsuboi
- Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo 3-8-1 Komaba, Meguro-ku Tokyo 153-8902 Japan
| | - Tetsuya Kitaguchi
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology 4259 Nagatsuta-cho, Midori-ku Yokohama-shi Kanagawa 226-8503 Japan
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Uchida N. Design of supramolecular nanosheets for drug delivery applications. Polym J 2023; 55:1-8. [PMID: 37359988 PMCID: PMC10169173 DOI: 10.1038/s41428-023-00788-3] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 03/29/2023] [Accepted: 03/31/2023] [Indexed: 06/28/2023]
Abstract
Two specific concepts have emerged in the field of materials science over the last several decades: nanosheets and supramolecular polymers. More recently, supramolecular nanosheets, in which these two concepts are integrated, have attracted particular attention, and they exhibit many fascinating characteristics. This review focuses on the design and applications of supramolecular nanosheets consisting of tubulin proteins and phospholipid membranes.
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Affiliation(s)
- Noriyuki Uchida
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588 Japan
- RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama, 351-0198 Japan
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Tanaka Y, Yu X, Terakawa S, Ishida T, Saitoh K, Zhang H, Asaka T, Itoigawa F, Kuwahara M, Ono S. Carbonization of a Molybdenum Substrate Surface and Nanoparticles by a One-Step Method of Femtosecond Laser Ablation in a Hexane Solution. ACS Omega 2023; 8:7932-7939. [PMID: 36872972 PMCID: PMC9979335 DOI: 10.1021/acsomega.2c07697] [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: 12/02/2022] [Accepted: 01/23/2023] [Indexed: 06/18/2023]
Abstract
Molybdenum carbides (MoC and Mo2C) are being reported for various applications, for example, catalysts for sustainable energies, nonlinear materials for laser applications, protective coatings for improving tribological performance, and so on. A one-step method for simultaneously fabricating molybdenum monocarbide (MoC) nanoparticles (NPs) and MoC surfaces with a laser-induced periodic surface structure (LIPSS) was developed by using pulsed laser ablation of a molybdenum (Mo) substrate in hexane. Spherical NPs with an average diameter of 61 nm were observed by scanning electron microscopy. The X-ray diffraction pattern and electron diffraction (ED) pattern results indicate that a face-centered cubic MoC was successfully synthesized for the NPs and on the laser-irradiated area. Notably, the ED pattern suggests that the observed NPs are nanosized single crystals, and a carbon shell was observed on the surface of MoC NPs. The X-ray diffraction pattern of both MoC NPs and LIPSS surface indicates the formation of FCC MoC, agreeing with the results of ED. The results of X-ray photoelectron spectroscopy also showed the bonding energy attributed to Mo-C, and the sp2-sp3 transition was confirmed on the LIPSS surface. The results of Raman spectroscopy have also supported the formation of MoC and amorphous carbon structures. This simple synthesis method for MoC may provide new possibilities for preparing Mo x C-based devices and nanomaterials, which may contribute to the development of catalytic, photonic, and tribological fields.
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Affiliation(s)
- Yoshiki Tanaka
- Department
of Physical Science and Engineering, Nagoya
Institute of Technology, Nagoya 466-8555, Japan
| | - Xi Yu
- Institute
of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8601, Japan
| | - Shusaku Terakawa
- Department
of Physical Science and Engineering, Nagoya
Institute of Technology, Nagoya 466-8555, Japan
| | - Takafumi Ishida
- Institute
of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8601, Japan
- Graduate
School of Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Koh Saitoh
- Institute
of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8601, Japan
- Graduate
School of Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Hongwei Zhang
- Biogas
Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610042, China
| | - Toru Asaka
- Life
Science and Applied Chemistry Advanced Ceramics, Nagoya Institute of Technology, Nagoya 466-8555, Japan
| | - Fumihiro Itoigawa
- Department
of Electrical and Mechanical Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
| | - Makoto Kuwahara
- Graduate
School of Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Shingo Ono
- Department
of Physical Science and Engineering, Nagoya
Institute of Technology, Nagoya 466-8555, Japan
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40
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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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41
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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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42
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Oka Y. Exclusion of Anchor-Matched Peptide Nucleic Acid from Liquid-Ordered Domains by Hybridization with Complementary Flavin-Labeled DNA. ACS Omega 2023; 8:1109-1113. [PMID: 36643542 PMCID: PMC9835180 DOI: 10.1021/acsomega.2c06463] [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: 10/07/2022] [Accepted: 12/02/2022] [Indexed: 06/17/2023]
Abstract
Membrane-anchored proteins and their mimics, such as peptide nucleic acids (PNAs), are known to partition preferentially into either lipid raft/liquid-ordered (lo) domains or into non-raft/liquid-disordered (ld) domains, depending on their lipophilic anchors. Here, anchor-matched PNA was demonstrated to be excluded from the lo microdomains of giant unilamellar vesicles by hybridization with the complementary flavin-labeled DNA. As shown in control experiments using Alexa Fluor 488-labeled DNA, which showed that the preferential partitioning was the lo domain, the domain distribution of PNA was not only dependent on the lipophilic anchor but also on the structure of the hybridized DNA or PNA pair. In such systems, the main factors that influence changes in the domain selectivity of the probes are most likely to also be interactivity (i.e., steric bulkiness), hydrophilicity, and self-assembling ability. These findings may have the potential to contribute to the elucidation of membrane-active peptides, the method of their activation, and their applications in medicine such as antimicrobial use, especially with regard to their actions at the interface between the lo and ld domains in cells.
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43
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Goto M, Yamane I, Arasawa S, Yanase T, Yokokura S, Nagahama T, Chueh YL, Shin Y, Kim Y, Shimada T. Synthesis of Epitaxial MoS 2/MoO 2 Core-Shell Nanowires by Two-Step Chemical Vapor Deposition with Turbulent Flow and Their Physical Properties. ACS Omega 2022; 7:39362-39369. [PMID: 36340117 PMCID: PMC9631877 DOI: 10.1021/acsomega.2c05586] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 08/30/2022] [Accepted: 10/05/2022] [Indexed: 06/16/2023]
Abstract
MoO2 nanowires (NWs), MoO2/MoS2 core-shell NWs, and MoS2 nanotubes (NTs) were synthesized by the turbulent flow chemical vapor deposition of MoO2 using MoO3, followed by sulfurization in the sulfur gas flow. The involvement of MoO x suboxide is suggested by density functional theory (DFT) calculations of the surface energies of MoO2. The thickness of the MoS2 layers can be controlled by precise tuning of sulfur vapor flow and temperatures. MoS2 had an armchair-type winding topology due to the epitaxial relation with the MoO2 NW surface. A single ∼ few-layer MoO2/MoS2 core-shell structure showed photoluminescence after the treatment with a superacid. The resistivities of an individual MoO2 NW and a MoS2 NT were measured, and they showed metallic and semiconducting resistivity-temperature relationships, respectively.
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Affiliation(s)
- Manami Goto
- Graduate
School of Chemical Sciences and Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo060-8628, Japan
| | - Ichiro Yamane
- Graduate
School of Chemical Sciences and Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo060-8628, Japan
| | - Shoki Arasawa
- Graduate
School of Chemical Sciences and Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo060-8628, Japan
| | - Takashi Yanase
- Department
of Chemistry, Toho University, Miyama 2-2-1, Funabashi274-8510, Japan
- Division
of Applied Chemistry, Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo060-8628, Japan
| | - Seiya Yokokura
- Graduate
School of Chemical Sciences and Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo060-8628, Japan
- Division
of Applied Chemistry, Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo060-8628, Japan
| | - Taro Nagahama
- Graduate
School of Chemical Sciences and Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo060-8628, Japan
- Division
of Applied Chemistry, Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo060-8628, Japan
| | - Yu-lun Chueh
- Department
of Materials Science and Engineering, National
Tsing Hua University, 101 Section 2, Kuang-Fu Road, Hsinchu300044, Taiwan R.O.C.
| | - Yongjun Shin
- Department
of Materials Science and Engineering, Seoul
National University, Seoul08826, Korea
| | - Yongmin Kim
- Department
of Physics, Dankook University, 119 Dandae-ro,
Dongnam-gu, Cheonan31116, Chungcheongnam-do, Korea
| | - Toshihiro Shimada
- Graduate
School of Chemical Sciences and Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo060-8628, Japan
- Division
of Applied Chemistry, Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo060-8628, Japan
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44
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Kanzaki C, Yoneda H, Nomura S, Maeda T, Numata M. Ionic supramolecular polymerization of water-soluble porphyrins: balancing ionic attraction and steric repulsion to govern stacking. RSC Adv 2022; 12:30670-30681. [PMID: 36337941 PMCID: PMC9597584 DOI: 10.1039/d2ra05542b] [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: 09/03/2022] [Accepted: 10/10/2022] [Indexed: 11/06/2022] Open
Abstract
We have synthesized novel water-soluble anionic porphyrin monomers that undergo pH-regulated ionic supramolecular polymerization in aqueous media. By tuning the total charge of the monomer, we selectively produced two different supramolecular polymers: J- and H-stacked. The main driving force toward the J-aggregated supramolecular polymers was the ionic interactions between the sulfonate and protonated pyrrole groups, ultimately affording neutral supramolecular polymers. In these J-aggregated supramolecular polymers, amide groups were aligned regularly along polymer wedges, which further assembled in an edge-to-edge manner to afford nanosheets. In contrast, the H-aggregated supramolecular polymers remained anionic, with their amide NH moieties acting as anion receptors along the polymer chains, thereby minimizing repulsion. For both polymers, varying the steric bulk of the peripheral ethylene glycol (EG) units controlled the rates of self-assembly as well as the degrees of polymerization. This steric effect was further tunable, depending on the solvation state of the EG chains. Accordingly, this new family of supramolecular polymers was created by taking advantage of unique driving forces that depended on both the pH and solvent.
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Affiliation(s)
- Chisako Kanzaki
- Department of Biomolecular Chemistry, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University Shimogamo, Sakyo-ku Kyoto 606-8522 Japan +81-75-703-5132
| | - Hiroshi Yoneda
- Department of Biomolecular Chemistry, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University Shimogamo, Sakyo-ku Kyoto 606-8522 Japan +81-75-703-5132
| | - Shota Nomura
- Department of Biomolecular Chemistry, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University Shimogamo, Sakyo-ku Kyoto 606-8522 Japan +81-75-703-5132
| | - Takato Maeda
- Department of Biomolecular Chemistry, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University Shimogamo, Sakyo-ku Kyoto 606-8522 Japan +81-75-703-5132
| | - Munenori Numata
- Department of Biomolecular Chemistry, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University Shimogamo, Sakyo-ku Kyoto 606-8522 Japan +81-75-703-5132
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45
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Yamaguchi S, Jonai S, Nakamura K, Marumoto K, Ohshita Y, Masuda A. Polarization-Type Potential-Induced Degradation in Front-Emitter p-Type and n-Type Crystalline Silicon Solar Cells. ACS Omega 2022; 7:36277-36285. [PMID: 36278074 PMCID: PMC9583327 DOI: 10.1021/acsomega.2c03866] [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: 06/21/2022] [Accepted: 09/26/2022] [Indexed: 06/16/2023]
Abstract
For SiO2 layers underneath the SiN x antireflection/passivation layers of front-emitter p-type c-Si solar cells, this paper presents an investigation into their effects on polarization-type potential-induced degradation (PID), in addition to a comparison of polarization-type PID behavior in front-emitter p-type c-Si cells and front-emitter n-type c-Si cells. After PID tests with a bias of +1000 V, p-type c-Si cells without SiO2 layers underneath the SiN x layers showed no degradation, although p-type c-Si cells with approx. 10 nm thick SiO2 layers showed polarization-type PID, which is characterized by a reduction of the short-circuit current density and the open-circuit voltage. This result implies that highly insulating layers such as SiO2 layers play an important role in the occurrence of polarization-type PID. Comparison of polarization-type PID in p-type and n-type c-Si cells with SiO2 layers indicated that degradation in the n-type cells is greater and saturates in a shorter time than in the p-type cells. This result is consistent with an earlier proposed model based on the assumption that polarization-type PID is caused by charge accumulation at K centers in SiN x layers. The findings described herein are crucially important for elucidating polarization-type PID and verifying the degradation model.
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Affiliation(s)
- Seira Yamaguchi
- Graduate
School of Science and Technology, Niigata
University, Niigata 950-2181, Japan
- Division
of Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
| | - Sachiko Jonai
- Graduate
School of Science and Technology, Niigata
University, Niigata 950-2181, Japan
| | - Kyotaro Nakamura
- Graduate
School of Engineering, Toyota Technological
Institute, Tempaku, Nagoya 468-8511, Japan
| | - Kazuhiro Marumoto
- Division
of Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
- Tsukuba
Research Center for Energy Materials Science (TREMS), University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
| | - Yoshio Ohshita
- Graduate
School of Engineering, Toyota Technological
Institute, Tempaku, Nagoya 468-8511, Japan
| | - Atsushi Masuda
- Graduate
School of Science and Technology, Niigata
University, Niigata 950-2181, Japan
- Interdisciplinary
Research Center for Carbon-Neutral Technologies, Niigata University, Niigata 950-2181, Japan
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46
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Bao Y, Maeki M, Ishida A, Tani H, Tokeshi M. Effect of Organic Solvents on a Production of PLGA-Based Drug-Loaded Nanoparticles Using a Microfluidic Device. ACS Omega 2022; 7:33079-33086. [PMID: 36157756 PMCID: PMC9494669 DOI: 10.1021/acsomega.2c03137] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [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: 05/20/2022] [Accepted: 08/22/2022] [Indexed: 06/16/2023]
Abstract
The translation of nanoparticles (NPs) from laboratory to clinical settings is limited, which is not ideal. One of the reasons for this is that we currently have limited ability to precisely regulate various physicochemical parameters of nanoparticles. This has made it difficult to rapidly perform targeted screening of drug preparation conditions. In this study, we attempted to broaden the range of preparation conditions for particle size-modulated poly(lactic-co-glycolic-acid) (PLGA) NP to enhance their applicability for drug delivery systems (DDS). This was done using a variety of organic solvents and a glass-based microfluidic device. Furthermore, we compared the PDMS-based microfluidic device to the glass-based microfluidic device in terms of the possibility of a wider range of preparation conditions, especially the effect of different solvents on the size of the PLGA NPs. PLGA NPs with different sizes (sub-200 nm) were successfully prepared, and three different types of taxanes were employed for encapsulation. The drug-loaded NPs showed size-dependent cytotoxicity in cellular assays, regardless of the taxane drug used.
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Affiliation(s)
- Yi Bao
- Graduate
School of Chemical Sciences and Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan
| | - Masatoshi Maeki
- Division
of Applied Chemistry, Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan
- JST
PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Akihiko Ishida
- Division
of Applied Chemistry, Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan
| | - Hirofumi Tani
- Division
of Applied Chemistry, Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan
| | - Manabu Tokeshi
- Division
of Applied Chemistry, Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan
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47
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Hagimori M, Yoshida T, Nishimura Y, Ogawa Y, Tanaka K. Syntheses of novel pyridine-based low-molecular-weight luminogens possessing aggregation-induced emission enhancement (AIEE) properties. Beilstein J Org Chem 2022; 18:580-587. [PMID: 35673408 PMCID: PMC9152276 DOI: 10.3762/bjoc.18.60] [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: 03/01/2022] [Accepted: 05/17/2022] [Indexed: 11/23/2022] Open
Abstract
Novel pyridine-based fluorescing compounds, viz. pyrido[1,2-a]pyrrolo[3,4-d]pyrimidines 3a,b and N-methyl-4-((pyridin-2-yl)amino)maleimides 4a–e, were selectively prepared by a one-pot reaction between a functionalized maleimide and 2-aminopyridines with electron-donating or electron-withdrawing groups at position 5 and were investigated photophysically and computationally. The photophysical studies revealed that all the synthesized compounds exhibited fluorescence in organic solvents, while N-methyl-4-((pyridin-2-yl)amino)-substituted maleimide derivatives 4a–e, which are based on an acceptor–donor–acceptor (A–D–A) system, exhibited aggregation-induced emission enhancement (AIEE) properties in aqueous media. Compounds 4a and 4e, bearing electron-withdrawing groups (Br and CF3, respectively) showed 7.0 and 15 times fluorescence enhancement. Time-dependent density functional theory (TD-DFT) calculations were performed to gain better insight into the electronic nature of the compounds with and without AIEE properties.
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Affiliation(s)
- Masayori Hagimori
- Faculty of Pharmaceutical Sciences, Mukogawa Women’s University, 11-68 Koshien Kyubancho, Nishinomiya 663-8179, Japan
- Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan
| | - Tatsusada Yoshida
- Faculty of Pharmaceutical Sciences, Nagasaki International University, 2825-7, Huis Ten Bosch, Sasebo 859-3298, Japan
| | - Yasuhisa Nishimura
- Graduate School of Engineering, Nagasaki University, 1-14, Bunkyo-machi, Nagasaki 852-8131, Japan
| | - Yukiko Ogawa
- Faculty of Pharmaceutical Sciences, Nagasaki International University, 2825-7, Huis Ten Bosch, Sasebo 859-3298, Japan
| | - Keitaro Tanaka
- Faculty of Pharmaceutical Sciences, Nagasaki International University, 2825-7, Huis Ten Bosch, Sasebo 859-3298, Japan
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48
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Cui M, Murase R, Shen Y, Sato T, Koyama S, Uchida K, Tanabe T, Takaishi S, Yamashita M, Iguchi H. An electrically conductive metallocycle: densely packed molecular hexagons with π-stacked radicals. Chem Sci 2022; 13:4902-4908. [PMID: 35655871 PMCID: PMC9067574 DOI: 10.1039/d2sc00447j] [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: 01/22/2022] [Accepted: 03/23/2022] [Indexed: 11/25/2022] Open
Abstract
Electrical conduction among metallocycles has been unexplored because of the difficulty in creating electronic transport pathways. In this work, we present an electrocrystallization strategy for synthesizing an intrinsically electron-conductive metallocycle, [Ni6(NDI-Hpz)6(dma)12(NO3)6]·5DMA·nH2O (PMC-hexagon) (NDI-Hpz = N,N'-di(1H-pyrazol-4-yl)-1,4,5,8-naphthalenetetracarboxdiimide). The hexagonal metallocycle units are assembled into a densely packed ABCABC… sequence (like the fcc geometry) to construct one-dimensional (1D) helical π-stacked columns and 1D pore channels, which were maintained under the liberation of H2O molecules. The NDI cores were partially reduced to form radicals as charge carriers, resulting in a room-temperature conductivity of (1.2-2.1) × 10-4 S cm-1 (pressed pellet), which is superior to that of most NDI-based conductors including metal-organic frameworks and organic crystals. These findings open up the use of metallocycles as building blocks for fabricating conductive porous molecular materials.
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Affiliation(s)
- Mengxing Cui
- Department of Chemistry, Graduate School of Science, Tohoku University 6-3 Aza-Aoba, Aramaki Sendai 980-8578 Japan
| | - Ryuichi Murase
- Department of Chemistry, Graduate School of Science, Tohoku University 6-3 Aza-Aoba, Aramaki Sendai 980-8578 Japan
| | - Yongbing Shen
- Department of Chemistry, Graduate School of Science, Tohoku University 6-3 Aza-Aoba, Aramaki Sendai 980-8578 Japan
| | - Tetsu Sato
- Department of Chemistry, Graduate School of Science, Tohoku University 6-3 Aza-Aoba, Aramaki Sendai 980-8578 Japan
| | - Shohei Koyama
- Department of Chemistry, Graduate School of Science, Tohoku University 6-3 Aza-Aoba, Aramaki Sendai 980-8578 Japan
| | - Kaiji Uchida
- Department of Chemistry, Graduate School of Science, Tohoku University 6-3 Aza-Aoba, Aramaki Sendai 980-8578 Japan
| | - Tappei Tanabe
- Department of Chemistry, Graduate School of Science, Tohoku University 6-3 Aza-Aoba, Aramaki Sendai 980-8578 Japan
| | - Shinya Takaishi
- Department of Chemistry, Graduate School of Science, Tohoku University 6-3 Aza-Aoba, Aramaki Sendai 980-8578 Japan
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University 6-3 Aza-Aoba, Aramaki Sendai 980-8578 Japan
- School of Materials Science and Engineering, Nankai University Tianjin 300350 P. R. China
| | - Hiroaki Iguchi
- Department of Chemistry, Graduate School of Science, Tohoku University 6-3 Aza-Aoba, Aramaki Sendai 980-8578 Japan
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49
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Oziri OJ, Wang Y, Watanabe T, Uno S, Maeki M, Tokeshi M, Isono T, Tajima K, Satoh T, Sato SI, Miura Y, Yamamoto T. PEGylation of silver nanoparticles by physisorption of cyclic poly(ethylene glycol) for enhanced dispersion stability, antimicrobial activity, and cytotoxicity. Nanoscale Adv 2022; 4:532-545. [PMID: 36132700 PMCID: PMC9417676 DOI: 10.1039/d1na00720c] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Accepted: 11/11/2021] [Indexed: 05/17/2023]
Abstract
Silver nanoparticles (AgNPs) are practically valuable in biological applications. However, no steady PEGylation has been established, which is essential for internal use in humans or animals. In this study, cyclic PEG (c-PEG) without any chemical inhomogeneity is physisorbed onto AgNPs to successfully PEGylate and drastically enhance the dispersion stability against physiological conditions, white light, and high temperature. In contrast, linear HO-PEG-OH and MeO-PEG-OMe do not confer stability to AgNPs, and HS-PEG-OMe, which is often used for gold nanoparticles, sulfidates the surface to considerably degrade the properties. TEM shows an essentially intact nanostructure of c-PEG-physisorbed AgNPs even after heating at 95 °C, while complete disturbance is observed for other AgNPs. Molecular weight- and concentration-dependent stabilization by c-PEG is investigated, and DLS and ζ-potential measurements prove the formation of a c-PEG layer on the surface of AgNPs. Furthermore, c-PEG-physisorbed AgNPs exhibit persistent antimicrobial activity and cytotoxicity.
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Affiliation(s)
| | - Yubo Wang
- Graduate School of Chemical Sciences and Engineering, Hokkaido University Sapporo Hokkaido 060-8628 Japan
| | - Tomohisa Watanabe
- Graduate School of Chemical Sciences and Engineering, Hokkaido University Sapporo Hokkaido 060-8628 Japan
| | - Shuya Uno
- Graduate School of Chemical Sciences and Engineering, Hokkaido University Sapporo Hokkaido 060-8628 Japan
| | - Masatoshi Maeki
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University Sapporo Hokkaido 060-8628 Japan
| | - Manabu Tokeshi
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University Sapporo Hokkaido 060-8628 Japan
| | - Takuya Isono
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University Sapporo Hokkaido 060-8628 Japan
| | - Kenji Tajima
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University Sapporo Hokkaido 060-8628 Japan
| | - Toshifumi Satoh
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University Sapporo Hokkaido 060-8628 Japan
| | - Shin-Ichiro Sato
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University Sapporo Hokkaido 060-8628 Japan
| | - Yutaka Miura
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology 4259 Nagatsutacho, Midori-ku Yokohama Kanagawa 226-8503 Japan
| | - Takuya Yamamoto
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University Sapporo Hokkaido 060-8628 Japan
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50
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He W, Tashiro S, Shionoya M. Highly selective acid-catalyzed olefin isomerization of limonene to terpinolene by kinetic suppression of the overreactions in a confined space of porous metal-macrocycle framework. Chem Sci 2022; 13:8752-8758. [PMID: 35975147 PMCID: PMC9350587 DOI: 10.1039/d2sc01561g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 03/17/2022] [Accepted: 06/02/2022] [Indexed: 11/21/2022] Open
Abstract
Natural enzymes control the intrinsic reactivity of chemical reactions in the natural environment, giving only the necessary products. In recent years, challenging research on the reactivity control of terpenes with structural diversity using artificial host compounds that mimic such enzymatic reactions has been actively pursued. A typical example is the acid-catalyzed olefin isomerization of (+)-limonene, which generally gives a complex mixture due to over-isomerization to thermodynamically favored isomers. Herein we report a highly controlled conversion of (+)-limonene by kinetic suppression of over-isomerization in a confined space of a porous metal–macrocycle framework (MMF) equipped with a Brønsted acid catalyst. The terminal double bond of (+)-limonene migrated to one neighbor, preferentially producing terpinolene. This reaction selectivity was in stark contrast to the homogeneous acid-catalyzed reaction in bulk solution and to previously reported catalytic reactions. X-ray structural analysis and examination of the reaction with adsorption inhibitors suggest that the reactive substrates may bind non-covalently to specific positions in the confined space of the MMF, thereby inhibiting the over-isomerization reaction. The nanospaces of the MMF with substrate binding ability are expected to enable highly selective synthesis of a variety of terpene compounds. A porous metal–macrocycle framework (MMF) equipped with a Brønsted acid catalyst in nanochannels enables highly selective isomerization of limonene to terpinolene by kinetically suppressing over-isomerization at confined acid sites.![]()
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Affiliation(s)
- Wei He
- Department of Chemistry, Graduate School of Science, The University of Tokyo Tokyo 113-0033 Japan
| | - Shohei Tashiro
- Department of Chemistry, Graduate School of Science, The University of Tokyo Tokyo 113-0033 Japan
| | - Mitsuhiko Shionoya
- Department of Chemistry, Graduate School of Science, The University of Tokyo Tokyo 113-0033 Japan
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