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Nakashima Y, Takai C, Razavi-Khosroshahi H, Fuji M. Effects of cations on the size and silica shell microstructure of hollow silica nanoparticles prepared using PAA/cation/NH4OH template. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124582] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Razavi-Khosroshahi H, Mohammadzadeh S, Hojamberdiev M, Kitano S, Yamauchi M, Fuji M. BiVO4/BiOX (X = F, Cl, Br, I) heterojunctions for degrading organic dye under visible light. ADV POWDER TECHNOL 2019. [DOI: 10.1016/j.apt.2019.04.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Razavi-Khosroshahi H, Mohammadzadeh S, Hojamberdiev M, Kitano S, Yamauchi M, Fuji M. Visible light active Bi 3TaO 7 nanosheets for water splitting. Dalton Trans 2019; 48:9284-9290. [PMID: 31162517 DOI: 10.1039/c9dt01020c] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Tantalate semiconductors are potential photocatalysts for hydrogen generation via photocatalytic water splitting reaction because the conduction band of tantalates is composed of the tantalum 5d orbital, which is located at a more negative potential than that of the H+/H2 half reaction, i.e., 0.0 V vs. NHE. Bi3TaO7 is a stable tantalate under acidic or alkaline conditions, with a band gap suitable for visible light absorption. However, the photocatalytic properties of Bi3TaO7 are only reported based on the dye degradation reactions, probably due to the fast electron/hole recombination losses. 2D crystal-like nanosheets with a thickness of a few nanometers show unique features such as high carrier mobility, the quantum Hall effect, high specific surface area, and excellent electrical/thermal conductivity. 2D structures can also enhance the photocatalytic properties because photo-generated charge carriers in nanosheets are less prone to fast recombinations as compared to their bulk counterparts. In this study, nanosheets of Bi3TaO7 are produced by a liquid exfoliation method and the photocatalytic hydrogen generation reaction is investigated for both the as-synthesized Bi3TaO7 nanoparticles and Bi3TaO7 nanosheets.
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Nakashima Y, Razavi-Khosroshahi H, Takai C, Fuji M. Non-firing ceramics: Effect of adsorbed water on surface activation of silica powder via ball milling treatment. ADV POWDER TECHNOL 2019. [DOI: 10.1016/j.apt.2019.03.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Takai-Yamashita C, Ando M, Razavi-Khosroshahi H, Fuji M. Oxidation/reduction control of the VO2 nanoparticle in the nano-confined space of the hollow silica nanoparticle. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2018.12.056] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Nakashima Y, Razavi-Khosroshahi H, Ishida H, Takai C, Fuji M. Non-firing ceramics: Activation of silica powder surface by a planetary ball milling. ADV POWDER TECHNOL 2019. [DOI: 10.1016/j.apt.2018.11.025] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Suthabanditpong W, Takai C, Razavi-Khosroshahi H, Okada Y, El-Salmawy M, Fuji M. Influence of CaCO3 pore-forming agent on porosity and thermal conductivity of cellulose acetate materials prepared by non-solvent induced phase separation. ADV POWDER TECHNOL 2019. [DOI: 10.1016/j.apt.2018.10.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Peng B, Takai C, Razavi-Khosroshahi H, Salmawy MSEL, Fuji M. Effect of CNTs on morphology and electromagnetic properties of non-firing CNTs/silica composite ceramics. ADV POWDER TECHNOL 2018. [DOI: 10.1016/j.apt.2018.04.024] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Nakashima Y, Takai C, Razavi-Khosroshahi H, Suthabanditpong W, Fuji M. Synthesis of ultra-small hollow silica nanoparticles using the prepared amorphous calcium carbonate in one-pot process. ADV POWDER TECHNOL 2018. [DOI: 10.1016/j.apt.2018.01.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Takai C, Senna M, Hoshino S, Razavi-Khosroshahi H, Fuji M. Chemical and thermal properties of VO2 mechanochemically derived from V2O5 by co-milling with paraffin wax. RSC Adv 2018; 8:21306-21315. [PMID: 35539917 PMCID: PMC9080850 DOI: 10.1039/c8ra02159g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 05/29/2018] [Indexed: 01/09/2023] Open
Abstract
A novel mechanochemical reduction process of V2O5 to VO2 was established by milling with paraffin wax (PW, average molecular weight 254–646), serving as a reductant. The reduction progressed with increasing milling time and mass ratio V2O5 : PW (MRVP). The mechanochemically derived VO2 became phase pure after milling for 3 h with an MRVP of 30 : 1 and exhibited a reversible polymorphic transformation between tetragonal and monoclinic phases at around 53–60 °C and 67–79 °C during heating and cooling, respectively. The latent heat was above 20 J g−1 in both processes, being superior to those of commercial VO2. Doping of starting V2O5 with Cr, Mo or W at 1 at% in the form of oxide did not increase the latent heat. This is another difference from the conventionally prepared doped VO2. These anomalous heat storage properties of mechanochemically derived VO2 were discussed mainly on the basis of X-ray photoelectron spectroscopy V2p3/2 peaks combined with ion etching. The observed relatively high heat storage capacity of undoped VO2 is primarily ascribed to the abundance of V4+ ionic states introduced during milling with PW, which were stabilized with simultaneously introduced structural degradation throughout the entire particles. The possible role of a remaining small amount of PW was also discussed. Reduction of V2O5via a mechano-chemical route brings about unique electronic states of vanadium. The resulting VO2 exhibits high latent heat storage during heating (a) and cooling (b).![]()
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Affiliation(s)
- Chika Takai
- Advanced Ceramics Research Center
- Nagoya Institute of Technology
- Tajimi
- Japan
| | - Mamoru Senna
- Advanced Ceramics Research Center
- Nagoya Institute of Technology
- Tajimi
- Japan
- Faculty of Science and Technology
| | - Satoshi Hoshino
- Advanced Ceramics Research Center
- Nagoya Institute of Technology
- Tajimi
- Japan
| | | | - Masayoshi Fuji
- Advanced Ceramics Research Center
- Nagoya Institute of Technology
- Tajimi
- Japan
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Razavi-Khosroshahi H, Edalati K, Emami H, Akiba E, Horita Z, Fuji M. Optical Properties of Nanocrystalline Monoclinic Y2O3 Stabilized by Grain Size and Plastic Strain Effects via High-Pressure Torsion. Inorg Chem 2017; 56:2576-2580. [DOI: 10.1021/acs.inorgchem.6b02725] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | - Masayoshi Fuji
- Advanced Ceramics
Research Center, Nagoya Institute of Technology, Gifu, Japan
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Nakashima Y, Takai C, Razavi-Khosroshahi H, Shirai T, Fuji M. Effects of primary- and secondary-amines on the formation of hollow silica nanoparticles by using emulsion template method. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.07.052] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Nakashima Y, Takai C, Wanghui C, Razavi-Khosroshahi H, Shirai T, Fuji M. Control size distribution of hollow silica nanoparticles by viscosity of emulsion template. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.07.091] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Razavi-Khosroshahi H, Edalati K, Hirayama M, Emami H, Arita M, Yamauchi M, Hagiwara H, Ida S, Ishihara T, Akiba E, Horita Z, Fuji M. Visible-Light-Driven Photocatalytic Hydrogen Generation on Nanosized TiO2-II Stabilized by High-Pressure Torsion. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01482] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Kaveh Edalati
- International
Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 812-8581, Japan
- Department
of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 812-8581, Japan
| | - Masashige Hirayama
- Department
of Chemistry, Faculty of Sciences, Kyushu University, Fukuoka 812-8581, Japan
| | - Hoda Emami
- International
Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 812-8581, Japan
| | - Makoto Arita
- Department
of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 812-8581, Japan
| | - Miho Yamauchi
- International
Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 812-8581, Japan
- Department
of Chemistry, Faculty of Sciences, Kyushu University, Fukuoka 812-8581, Japan
| | - Hidehisa Hagiwara
- International
Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 812-8581, Japan
- Department
of Applied Chemistry, Faculty of Engineering, Kyushu University, Fukuoka 812-8581, Japan
| | - Shintaro Ida
- International
Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 812-8581, Japan
- Department
of Applied Chemistry, Faculty of Engineering, Kyushu University, Fukuoka 812-8581, Japan
| | - Tatsumi Ishihara
- International
Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 812-8581, Japan
- Department
of Applied Chemistry, Faculty of Engineering, Kyushu University, Fukuoka 812-8581, Japan
| | - Etsuo Akiba
- International
Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 812-8581, Japan
- Department
of Mechanical Engineering, Faculty of Engineering, Kyushu University, Fukuoka 812-8581, Japan
| | - Zenji Horita
- International
Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka 812-8581, Japan
- Department
of Materials Science and Engineering, Faculty of Engineering, Kyushu University, Fukuoka 812-8581, Japan
| | - Masayoshi Fuji
- Advanced
Ceramics Research Center, Nagoya Institute of Technology, Tajimi 507-0033, Japan
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