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Wang W, Tan J, Wang H, Xiao H, Shen R, Huang B, Yuan Q. Self-Powered and Self-Recoverable Multimodal Force Sensors Based on Trap State and Interfacial Electron Transfer. Angew Chem Int Ed Engl 2024; 63:e202404060. [PMID: 38588061 DOI: 10.1002/anie.202404060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Revised: 03/25/2024] [Accepted: 04/08/2024] [Indexed: 04/10/2024]
Abstract
Multi-dimensional force sensing that combines intensity, location, area and the like could gather a wealth of information from mechanical stimuli. Developing materials with force-induced optical and electrical dual responses would provide unique opportunities to multi-dimensional force sensing, with electrical signals quantifying the force amplitude and the luminescence output providing spatial distribution of force. However, the reliance on external power supply and high-energy excitation source brings significant challenges to the applicability of multi-dimensional force sensors. Here we reported the mechanical energy-driven and sunlight-activated materials with force-induced dual responses, and investigated the underlying mechanisms of self-sustainable force sensing. Theoretical analysis and experimental data unraveled that trap-controlled luminescence and interfacial electron transfer play a major role in force-induced optical and electrical output. These materials were manufactured into pressure sensor with renewable dual-mode output for quantifying and visualization of pressures by electrical and optical output, respectively, without power supply and high-energy irradiation. The quantification of tactile sensation and stimuli localization of mice highlighted the multi-dimensional sensing ability of the sensor. Overall, this self-powered pressure sensor with multimodal output provides more modalities of force sensing, poised to change the way that intelligent devices sense with the world.
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Affiliation(s)
- Wenjie Wang
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, 410082, Changsha, China
| | - Jie Tan
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, 410082, Changsha, China
| | - Han Wang
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, 410082, Changsha, China
| | - Hua Xiao
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, 410082, Changsha, China
| | - Ruichen Shen
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, 410082, Changsha, China
| | - Bolong Huang
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hong Kong SAR, China
| | - Quan Yuan
- Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, 410082, Changsha, China
- College of Chemistry and Molecular Sciences, Wuhan University, 430072, Wuhan, China
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2
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Ohya S, Tsuruoka S, Kaneda M, Shinya H, Fukushima T, Takeda T, Tadano Y, Endo T, Anh LD, Masago A, Katayama-Yoshida H, Tanaka M. Colossal Magnetoresistive Switching Induced by d 0 Ferromagnetism of MgO in a Semiconductor Nanochannel Device with Ferromagnetic Fe/MgO Electrodes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024:e2307389. [PMID: 38353134 DOI: 10.1002/adma.202307389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 01/08/2024] [Indexed: 03/12/2024]
Abstract
Exploring potential spintronic functionalities in resistive switching (RS) devices is of great interest for creating new applications, such as multifunctional resistive random-access memory and novel neuromorphic computing devices. In particular, the importance of the spin-triplet state of cation vacancies in oxide materials, which is induced by localized and strong O-2p on-site Coulomb interactions, in RS devices has been overlooked. d0 ferromagnetism sometimes appears due to the spin-triplet state and ferromagnetic Zener's double exchange interactions between cation vacancies, which are occasionally strong enough to make nonmagnetic oxides ferromagnetic. Here, for the first time, anomalous and colossal magneto-RS (CMRS) with very high magnetic field dependence is demonstrated by utilizing an unconventional RS device composed of a Ge nanochannel with all-epitaxial single-crystalline Fe/MgO electrodes. The device shows colossal and unusual behavior as the threshold voltage and ON/OFF ratio strongly depend on a magnetic field, which is controllable with an applied voltage. This new phenomenon is attributed to the formation of d0 -ferromagnetic filaments by attractive Mg vacancies due to the spin-triplet states with ferromagnetic double exchange interactions and the ferromagnetic proximity effect of Fe on MgO. The findings will allow the development of energy-efficient CMRS devices with multifield susceptibility.
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Affiliation(s)
- Shinobu Ohya
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
- Center for Spintronics Research Network, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
- Institute for Nano Quantum Information Electronics (NanoQuine), The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan
| | - Shun Tsuruoka
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Masaya Kaneda
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Hikari Shinya
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
- Center for Spintronics Research Network, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
- Center for Spintronics Research Network, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
- Center for Spintronics Research Network (CSRN), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan
| | - Tetsuya Fukushima
- Center for Spintronics Research Network, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan
- Research Center for Computational Design of Advanced Functional Materials, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8560, Japan
- The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
| | - Takahito Takeda
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Yuriko Tadano
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Tatsuro Endo
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Le Duc Anh
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
- Center for Spintronics Research Network, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Akira Masago
- Center for Spintronics Research Network, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan
- Research Institute for Value-Added-Information Generation, Japan Agency for Marin-Earth Science and Technology, 3173-25 Showa-machi, Yokohama, Kanagawa, 236-0001, Japan
| | - Hiroshi Katayama-Yoshida
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
- Center for Spintronics Research Network, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
- Center for Spintronics Research Network, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan
| | - Masaaki Tanaka
- Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
- Center for Spintronics Research Network, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
- Institute for Nano Quantum Information Electronics (NanoQuine), The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan
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Tahir MY, Sillanpaa M, Almutairi TM, Mohammed AAA, Ali S. Excellent photocatalytic and antibacterial activities of bio-activated carbon decorated magnesium oxide nanoparticles. CHEMOSPHERE 2023; 312:137327. [PMID: 36410509 DOI: 10.1016/j.chemosphere.2022.137327] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 11/05/2022] [Accepted: 11/17/2022] [Indexed: 06/16/2023]
Abstract
Green production of nanomaterials are restrict toxic substances and motivated the noxious free environment. Photocatalysis and antibacterial resistance are more promising and efficient fields for their chemical reductants and clean environment. Herein, we adopted a green and simple method for the biosynthesis of MgO NPs using Manilkara zapota as a bio source. Recently, the green synthesis of magnesium oxide nanoparticles has been a keen interest amongst researchers and scientists due to its simplicity eco-friendliness, non-toxic, inexpensive and potential to perform as an antibacterial agent. Activated carbon/Magnesium oxide (AC/MgO) photocatalyst was blended through a simple solution evaporation method. The surface electron microscopy (SEM) study reviles that AC/MgO had smooth and aggregated particles. The Fourier transform infrared (FT-IR) and x-ray diffraction (XRD) study confirms the structural formation and incorporation of nanoparticles into the AC matrix. Results confirmed the flourishing integration of MgO NPs over the activated carbon matrix. The electron movement and valency of AC/MgO photocatalyst reduced the bandgap and their findings were characterized by ultra visible diffuse reflectance spectroscopy (UV-DRS) and x-ray photoelectron spectroscopy (XPS). The blended AC/MgO photocatalyst was analyzed for photodegradation of Rhodamine- B (Rh-B) dye using a UV-visible spectrophotometer. The degradation study projects that the AC/MgO photocatalyst degrades (Rh-B) dye with 99% efficiency under simulated solar irradiation. This efficient degradation of (Rh-B) dye by AC/MgO photocatalyst is ascribed to the synergetic AC as catalytic support and adsorbent and MgO as photocatalyst. Finally, the photocatalytic material shows a better bactericidal effect in both gram-positive bacteria Escherichia coli-745 and gram-negative bacteria Staphylococcus aureus-9779. The AC/MgO photocatalyst is effectively used in bacteriocidal and photocatalytic removal of dyes and can be used for further development of water reuse and bio-medical fields. In addition, this research shows a viable method for synthesizing a cheap and effective AC/MgO for the photocatalytic destruction of organic pollutants.
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Affiliation(s)
- Muhammad Yahya Tahir
- Department of Environmental Sciences and Engineering, Government College University Faisalabad, Faisalabad, Pakistan.
| | - Mika Sillanpaa
- Department of Biological and Chemical Engineering, Aarhus University, Nørrebrogade 44, 8000, Aarhus, Denmark
| | - Tahani Mazyad Almutairi
- Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Abdallah A A Mohammed
- Department of Chemistry, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Shafaqat Ali
- Department of Environmental Sciences and Engineering, Government College University Faisalabad, Faisalabad, Pakistan; Department of Biological Sciences and Technology, China Medical University, Taichung, 40402, Taiwan.
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4
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Khorrami G, Nadafan M, Dehghani Z, Izadi-Darbandi A, Ali GA. Green synthesise, crystal structure, linear and nonlinear optical investigation of MgO1-xMnOx nanocomposite via Z-scan technique. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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5
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Effect of hydrogen on magnetic properties in MgO studied by first-principles calculations and experiments. Sci Rep 2022; 12:10063. [PMID: 35710801 PMCID: PMC9203533 DOI: 10.1038/s41598-022-13949-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 05/31/2022] [Indexed: 11/18/2022] Open
Abstract
We investigated the effects of both intrinsic defects and hydrogen atom impurities on the magnetic properties of MgO samples. MgO in its pure defect-free state is known to be a nonmagnetic semiconductor. We employed density-functional theory and the Heyd–Scuseria–Ernzerhof (HSE) density functional. The calculated formation energy and total magnetic moment indicated that uncharged \documentclass[12pt]{minimal}
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\begin{document}$${\mathrm{V}}_{\mathrm{Mg}}^{0}$$\end{document}VMg0 and singly charged \documentclass[12pt]{minimal}
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\begin{document}$${\mathrm{V}}_{\mathrm{Mg}}^{-1}$$\end{document}VMg-1 magnesium vacancies are more stable than oxygen vacancies (VO) under O-rich growth conditions and introduce a magnetic moment to MgO. The calculated density of states (DOS) results demonstrated that magnetic moments of VMg result from spin polarization of an unpaired electron of the partially occupied valence band, which is dominated by O 2p orbitals. Based on our calculations, VMg is the origin of magnetism and ferromagnetism in MgO. In contrast, the magnetic moment of the magnetic VMg-MgO crystal is suppressed by hydrogen (H) atoms, and unpaired electrons are donated to the unpaired electronic states of VMg when the defect complex Hi-VMg is formed. This suggests that H causes a reduction in magnetization of the ferromagnetic MgO. We then performed experimental studies to verify the DFT predictions by subjecting the MgO sample to a thermal treatment that creates Mg vacancies in the structure and intentionally doping the MgO sample with hydrogen atoms. We found good agreement between the DFT results and the experimental data. Our findings suggest that the ferromagnetism and diamagnetism of MgO can be controlled by heat treatment and hydrogen doping, which may find applications in magnetic sensing and switching under different environmental conditions.
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Assis M, Pontes Ribeiro RA, Carvalho MH, Teixeira MM, Gobato YG, Prando GA, Mendonça CR, de Boni L, Aparecido de Oliveira AJ, Bettini J, Andrés J, Longo E. Unconventional Magnetization Generated from Electron Beam and Femtosecond Irradiation on α-Ag 2WO 4: A Quantum Chemical Investigation. ACS OMEGA 2020; 5:10052-10067. [PMID: 32391493 PMCID: PMC7203983 DOI: 10.1021/acsomega.0c00542] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 04/13/2020] [Indexed: 05/29/2023]
Abstract
Novel magnetic metals and metal oxides that use both the spin and charge of an electron offer exciting technological applications. Their discovery could boost research on functional nanoscale materials. Here, for the first time, we report the magnetization of α-Ag2WO4 under electron beam and femtosecond laser irradiation. The formation and growth of silver oxides (AgO, Ag2O, and Ag3O4) and Ag nanofilaments can be observed on the surface of α-Ag2WO4 crystals. These features were also present in the composition of an extruded material and could open new avenues for surface magnetism studies. In order to understand these results, we used first-principles density functional theory calculations. This allowed us to investigate several potential scenarios for controlling magnetic properties. The effect of electron addition on the crystalline structures of α-Ag2WO4, Ag3O4, Ag2O, and AgO has been analyzed in detail. The creation of Ag and O vacancies on these compounds was also analyzed. Based on structural and electronic changes at the local coordination site of Ag, a mechanism was proposed. The mechanism illustrates the processes responsible for the formation and growth of metallic Ag and the magnetic response to electron beam irradiation.
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Affiliation(s)
- Marcelo Assis
- CDMF,
LIEC, Chemistry Department, Federal University
of São Carlos—(UFSCar), P.O. Box 676, 13565-905 São
Carlos, São Paulo, Brazil
| | - Renan Augusto Pontes Ribeiro
- CDMF,
LIEC, Chemistry Department, Federal University
of São Carlos—(UFSCar), P.O. Box 676, 13565-905 São
Carlos, São Paulo, Brazil
| | - Maria Helena Carvalho
- Physics
Department, Federal University of São
Carlos—(UFSCar), P.O. Box 676, 13565-905 São Carlos, São Paulo, Brazil
| | - Mayara Mondego Teixeira
- CDMF,
LIEC, Chemistry Department, Federal University
of São Carlos—(UFSCar), P.O. Box 676, 13565-905 São
Carlos, São Paulo, Brazil
| | - Yara Galvão Gobato
- Physics
Department, Federal University of São
Carlos—(UFSCar), P.O. Box 676, 13565-905 São Carlos, São Paulo, Brazil
| | - Gabriela Augusta Prando
- Physics
Department, Federal University of São
Carlos—(UFSCar), P.O. Box 676, 13565-905 São Carlos, São Paulo, Brazil
| | - Cleber Renato Mendonça
- IFSC—Instituto
de Física de São Carlos, Universidade
de São Paulo—(USP), 13566-590 São Carlos, São Paulo, Brazil
| | - Leonardo de Boni
- IFSC—Instituto
de Física de São Carlos, Universidade
de São Paulo—(USP), 13566-590 São Carlos, São Paulo, Brazil
| | | | - Jefferson Bettini
- Brazilian
Nanotechnology National Laboratory (LNNano), Rua Giuseppe Maximo Scolfa no 10000, BR-13083100 Campinas, São Paulo, Brazil
| | - Juan Andrés
- Department
of Analytical and Physical Chemistry, University
Jaume I (UJI), 12071 Castelló, Spain
| | - Elson Longo
- CDMF,
LIEC, Chemistry Department, Federal University
of São Carlos—(UFSCar), P.O. Box 676, 13565-905 São
Carlos, São Paulo, Brazil
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7
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Zeng W, Yin Z, Gao M, Wang X, Feng J, Ren Y, Wei T, Fan Z. In-situ growth of magnesium peroxide on the edge of magnesium oxide nanosheets: Ultrahigh photocatalytic efficiency based on synergistic catalysis. J Colloid Interface Sci 2020; 561:257-264. [DOI: 10.1016/j.jcis.2019.11.122] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 11/30/2019] [Accepted: 11/30/2019] [Indexed: 01/12/2023]
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8
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Abdel-Aziz MM, Emam TM, Elsherbiny EA. Bioactivity of magnesium oxide nanoparticles synthesized from cell filtrate of endobacterium Burkholderia rinojensis against Fusarium oxysporum. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 109:110617. [PMID: 32229008 DOI: 10.1016/j.msec.2019.110617] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Revised: 09/23/2019] [Accepted: 12/28/2019] [Indexed: 12/24/2022]
Abstract
The present study was performed to synthesize, for the first time, the magnesium oxide nanoparticles (MgO NPs) using the cell filtrate of the endobacterium Burkholderia rinojensis. The MgO NPs were characterized by Ultraviolet-visible (UV-Vis), Fourier-transform infrared (FTIR), X-ray diffraction (XRD), Energy dispersive X-ray (EDX), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and zeta potential (ZP). The UV spectrum of the MgO NPs showed a sharp absorption peak at 330 nm. The FTIR results confirm that the bioactive compounds act as reducing and capping agents of synthesized MgO NPs. The XRD pattern showed three major peaks of the crystalline metallic MgO NPs. Presence of magnesium and oxygen were confirmed by EDX profile. Both SEM and TEM revealed the MgO NPs as roughly spherical granular structures, and the size was 26.70 nm. The zeta potential was -32.1 mV, which indicated the stability of the MgO NPs in suspension. The MgO NPs showed considerable antifungal and antibiofilm activities against Fusarium oxysporum f. sp. lycopersici. At the concentration of 15.36 μg/ml, the MgO NPs completely inhibited the mycelial growth of the fungus. The biofilm formation of the pathogen was completely suppressed by MgO NPs at 1.92 μg/ml. The MgO NPs caused severe morphological changes on the hyphal morphology and biofilm formation of the fungus with significant damage on the fungal membrane integrity.
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Affiliation(s)
- Marwa M Abdel-Aziz
- Regional Center for Mycology and Biotechnology (RCMB), Al-Azhar University, Cairo, Egypt
| | | | - Elsherbiny A Elsherbiny
- Plant Pathology Department, Faculty of Agriculture, Mansoura University, Mansoura 35516, Egypt.
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Devaraja P, Avadhani D, Nagabhushana H, Prashantha S, Sharma S, Nagabhushana B, Nagaswarupa H, Prasad BD. Luminescence properties of MgO: Fe3+ nanopowders for WLEDs under NUV excitation prepared via propellant combustion route. JOURNAL OF RADIATION RESEARCH AND APPLIED SCIENCES 2019. [DOI: 10.1016/j.jrras.2015.02.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- P.B. Devaraja
- Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur, 572 103, India
- Department of Physics, C.M.R.T.U, RV College of Engineering, Bangalore, 560 059, India
- Department of Physics, Acharya Institute of Graduate Studies, Bangalore, 560 090, India
| | - D.N. Avadhani
- Department of Physics, C.M.R.T.U, RV College of Engineering, Bangalore, 560 059, India
| | - H. Nagabhushana
- Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur, 572 103, India
| | - S.C. Prashantha
- Research Center, Department of Science, East West Institute of Technology, Bangalore, 560 091, India
| | - S.C. Sharma
- Chattisgarh Swamy Vivekananda Technological University, Bhilai (CG), 493441, India
| | - B.M. Nagabhushana
- Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore, 560 054, India
| | - H.P. Nagaswarupa
- Research Center, Department of Science, East West Institute of Technology, Bangalore, 560 091, India
| | - B. Daruka Prasad
- Department of Physics, B.M.S. Institute of Technology, Yelahanka, Bangalore, 560 064, India
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10
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Yang K, Wang X, Zhang J, Cheng Y, Zhang C, Zeng Z, Lin H. Effects of vacancy defects on Fe properties incorporated in MgO. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:295701. [PMID: 29873304 DOI: 10.1088/1361-648x/aacabd] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Distributions of Fe in MgO containing Mg vacancy, O vacancy, and Schottky defect are investigated based on the density functional theory (DFT). Our results show that since Mg vacancy will remove electrons from MgO, Fe tends to get close to Mg vacancy but far from O vacancy. The Mg vacancy can decrease the magnetic moment of iron and change its valence state from 2+ to 3+, which leads to ~5% decrease of Fe-O bond length comparable to the effect of 30 GPa external pressure. Furthermore, iron incorporation can increase the Schottky defect concentration of MgO especially in the environment of the Earth's lower mantle, where ~20 mol% Fe-bearing MgO locates at extreme high temperature conditions.
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Affiliation(s)
- Kaishuai Yang
- Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China. University of Science and Technology of China, Hefei 230026, People's Republic of China. Beijing Computational Science Research Center, Beijing 100084, People's Republic of China
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11
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12
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Pandiaraj P, Gnanavelbabu A, Saravanan P. Experimental and Statistical Analysis of MgO Nanofluids for Thermal Enhancement in a Novel Flat Plate Heat Pipes. INTERNATIONAL JOURNAL OF NANOSCIENCE 2017. [DOI: 10.1142/s0219581x17600183] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Metallic fluids like CuO, Al2O3, ZnO, SiO2 and TiO2 nanofluids were widely used for the development of working fluids in flat plate heat pipes except magnesium oxide (MgO). So, we initiate our idea to use MgO nanofluids in flat plate heat pipe as a working fluid material. MgO nanopowders were synthesized by wet chemical method. Solid state characterizations of synthesized nanopowders were carried out by Ultraviolet Spectroscopy (UV), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) techniques. Synthesized nanopowders were prepared as nanofluids by adding water and as well as water/ethylene glycol as a binary mixture. Thermal conductivity measurements of prepared nanofluids were studied using transient hot-wire apparatus. Response surface methodology based on the Box–Behnken design was implemented to investigate the influence of temperature (30–60[Formula: see text]C), particle fraction (1.5–4.5 vol.%), and solution pH (4–12) of nanofluids as the independent variables. A total of 17 experiments were accomplished for the construction of second-order polynomial equations for target output. All the influential factors, their mutual effects and their quadratic terms were statistically validated by analysis of variance (ANOVA). The optimum stability and thermal conductivity of MgO nanofluids with various temperature, volume fraction and solution pH were predicted and compared with experimental results. The results revealed that increase in particle fraction and pH of MgO nanofluids at certain points would increase thermal conductivity and become stable at nominal temperature.
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Affiliation(s)
- P. Pandiaraj
- DoME, Anna University, CEG Campus, Chennai, Tamil Nadu, India
| | - A. Gnanavelbabu
- DoIE, Anna University, CEG Campus, Chennai, Tamil Nadu, India
| | - P. Saravanan
- DoIE, Anna University, CEG Campus, Chennai, Tamil Nadu, India
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13
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Hikku G, K. J, Vignesh Kumar S. Nanoporous MgO as self-cleaning and anti-bacterial pigment for alkyd based coating. J IND ENG CHEM 2017. [DOI: 10.1016/j.jiec.2017.03.040] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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14
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Asgarian S, Kargar Z, Mozaffari M. Investigation of cation vacancies in Zinc substituted maghemite by positron annihilation lifetime and Doppler broadening spectroscopy. Appl Radiat Isot 2017; 125:18-22. [DOI: 10.1016/j.apradiso.2017.04.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 03/18/2017] [Accepted: 04/01/2017] [Indexed: 10/19/2022]
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Pathak N, Gupta SK, Prajapat CL, Sharma SK, Ghosh PS, Kanrar B, Pujari PK, Kadam RM. Defect induced ferromagnetism in MgO and its exceptional enhancement upon thermal annealing: a case of transformation of various defect states. Phys Chem Chem Phys 2017; 19:11975-11989. [DOI: 10.1039/c7cp01776f] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Micron size MgO particles showed various defect induced ferromagnetism with an exceptional enhancement upon thermal annealing due to transformation of one kind of cluster vacancy to another.
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Affiliation(s)
- Nimai Pathak
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai
- India
- Homi Bhabha National Institute
| | | | - C. L. Prajapat
- Technical Physics Division
- Bhabha Atomic Research Centre
- Mumbai
- India
| | - S. K. Sharma
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai
- India
| | - P. S. Ghosh
- Homi Bhabha National Institute
- Mumbai
- India
- Materials Science Division
- Bhabha Atomic Research Centre
| | - Buddhadev Kanrar
- Homi Bhabha National Institute
- Mumbai
- India
- Fuel Chemistry Division
- Bhabha Atomic Research Centre
| | - P. K. Pujari
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai
- India
- Homi Bhabha National Institute
| | - R. M. Kadam
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai
- India
- Homi Bhabha National Institute
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16
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Xu Q, Wang ZJ, Chang ZJ, Liu JJ, Ren YX, Sun HY. Synthesis and properties of Ag-doped ZnO films with room temperature ferromagnetism. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.10.044] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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17
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Alla SK, Mandal RK, Prasad NK. Optical and magnetic properties of Mg2+ doped CeO2 nanoparticles. RSC Adv 2016. [DOI: 10.1039/c6ra23063f] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Nanocrystalline MgxCe1−xO2 (x = 0.01, 0.03, and 0.05) particles with near uniform size were synthesized by microwave refluxing method.
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Affiliation(s)
- S. K. Alla
- Department of Metallurgical Engineering
- IIT (BHU)
- Varanasi – 221005
- India
| | - R. K. Mandal
- Department of Metallurgical Engineering
- IIT (BHU)
- Varanasi – 221005
- India
| | - N. K. Prasad
- Department of Metallurgical Engineering
- IIT (BHU)
- Varanasi – 221005
- India
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18
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Mageshwari K, Mali SS, Sathyamoorthy R, Patil PS. Template-free synthesis of MgO nanoparticles for effective photocatalytic applications. POWDER TECHNOL 2013. [DOI: 10.1016/j.powtec.2013.09.016] [Citation(s) in RCA: 134] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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19
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Magnetism of Amorphous and Nano-Crystallized Dc-Sputter-Deposited MgO Thin Films. NANOMATERIALS 2013; 3:486-497. [PMID: 28348346 PMCID: PMC5304652 DOI: 10.3390/nano3030486] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Revised: 07/20/2013] [Accepted: 07/26/2013] [Indexed: 11/17/2022]
Abstract
We report a systematic study of room-temperature ferromagnetism (RTFM) in pristine MgO thin films in their amorphous and nano-crystalline states. The as deposited dc-sputtered films of pristine MgO on Si substrates using a metallic Mg target in an O2 containing working gas atmosphere of (N2 + O2) are found to be X-ray amorphous. All these films obtained with oxygen partial pressure (PO2) ~10% to 80% while maintaining the same total pressure of the working gas are found to be ferromagnetic at room temperature. The room temperature saturation magnetization (MS) value of 2.68 emu/cm3 obtained for the MgO film deposited in PO2 of 10% increases to 9.62 emu/cm3 for film deposited at PO2 of 40%. However, the MS values decrease steadily for further increase of oxygen partial pressure during deposition. On thermal annealing at temperatures in the range 600 to 800 °C, the films become nanocrystalline and as the crystallite size grows with longer annealing times and higher temperature, MS decreases. Our study clearly points out that it is possible to tailor the magnetic properties of thin films of MgO. The room temperature ferromagnetism in MgO films is attributed to the presence of Mg cation vacancies.
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22
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Gao F, Hu J, Wang J, Yang C, Qin H. Ferromagnetism induced by intrinsic defects and carbon substitution in single-walled ZnO nanotube. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.01.069] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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23
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Liu J, Wang W, Guo Z, Zeng R, Dou S, Chen X. Peashell-like nanostructure—a new kind of one-dimensional nanostructure: the case of magnesium oxide. Chem Commun (Camb) 2010; 46:3887-9. [DOI: 10.1039/c0cc00167h] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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