論文 - 松根 英樹
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Yamamoto T., Uchiyama S., Matsune H., Kishida M.
IOP Conference Series: Materials Science and Engineering 778 ( 1 ) 2020年4月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IOP Conference Series: Materials Science and Engineering
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Yokoo K., Matsune H., Kishida M., Tatebayashi J., Yamamoto T.
Powder Technology 355 657 - 666 2019年10月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Powder Technology
© 2019 A fluidized bed type particulate matter (PM) removal device has been developed by focusing on the adhesion force under condition of non-water vapor. This device efficiently collects fine PM and can be operated as a low-temperature continuous regeneration device. The exhaust gas of a combustor includes water vapor at concentrations of 5–15 vol%. To further develop this device, the effect of water vapor on the continuous regeneration was investigated. The collection efficiency increases due to the water vapor. The reaction rate constant increases with increasing water vapor and with decreasing PM diameter. It is shown that water vapor promotes PM combustion at 250–400 °C. A smaller PM suits PM collection and combustion because smaller PM results in relatively larger adhesion force and well contacts the oxidant by dispersing it on the bed particles. The continuous regeneration temperature decreases to 380 °C due to the water vapor under optimal conditions.
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Anomalous heat effects induced by metal nano-composites and hydrogen gas 査読あり
Iwamura Y., Itoh T., Kasagi J., Kitamura A., Takahashi A., Takahashi K., Seto R., Hatano T., Hioki T., Motohiro T., Nakamura M., Uchimura M., Takahashi H., Sumitomo S., Furuyama Y., Kishida M., Matsune H.
Journal of Condensed Matter Nuclear Science 29 119 - 128 2019年8月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Journal of Condensed Matter Nuclear Science
© 2019 ISCMNS. All rights reserved. Collaborative research among Technova Inc., Nissan Motor Co. Ltd., Kobe Univ., Kyushu Univ., Nagoya Univ. and Tohoku Univ. was done from Oct. 2015 to Oct. 2017. For this collaborative work, a new accurate oil mass-flow calorimetry system was developed at Tohoku University to replicate anomalous heat generation experiments reported by Technova and the Kobe Univ. Group. In this paper, we present evidence of anomalous excess heat effects obtained from experiments at our laboratory at Tohoku University. Excess energy experiments were done using nano-sized metal composites with H2 or D2 gas. Anomalous excess heat generation were observed for all the samples at elevated temperature (150-350°C) except for the palladium nanoparticles embedded in mesoporous SiO2 (PSn1). The amount of anomalous heat generation per hydrogen atom ranged from 15 eV/H or D to 2.1 keV/H or D, which is too much to be explained by any known chemical process. Coincident burst events of pressure and gas temperature were observed for all the experiments using the CuNi7Zr15-Ox with H2 gas, which suggested sudden energy releases in the reaction chamber. These observations suggest large local energy bursts. Excess heat experiments using the same material at Kobe and Tohoku Universities showed similar experimental results. Qualitative reproducibility between the Kobe and Tohoku experiments was good.
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Matsune H., Ono T., Yoshida R., Yamamoto T., Kishida M.
Chemistry Letters 48 ( 9 ) 1058 - 1061 2019年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Chemistry Letters
© 2019 The Chemical Society of Japan A new class of nanoparticle (NP) is fabricated by cross-linking amino-functionalized silsesquioxane units with zinc ions via coordination bonds to create a drug delivery nanocarrier exhibiting rapid drug-release together with self-decomposition in response to glutathione (GSH). Regarding doxorubicin-loaded NPs, characterization of the nanostructures, their responsiveness to GSH and their cellular uptake by HeLa cells are examined.
DOI： 10.1246/cl.190353
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Yokoo K., Matsune H., Kishida M., Tatebayashi J., Yamamoto T.
Advanced Powder Technology 31 ( 2 ) 718 - 729 2019年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Advanced Powder Technology
© 2019 The Society of Powder Technology Japan The size of particulate matter (PM) generated by combustion has decreased with the improvement of combustion technology. While small PM has a significant negative impact on the human body, it is difficult for a conventional PM removal device to collect small PM. We developed a fluidized bed type PM removal device with a focusing adhesion force. This device collects small PM effectively and can be operated as a continuous regeneration device at low temperature. To further develop this device, it is important to investigate the PM combustion characteristics in this device. The kinetic model constructed in conventional thermogravimetry could not accurately represent the combustion rates of the solid fuel in the fluidized bed. Therefore, a new thermogravimetric apparatus was constructed in this study that generates the direct collision of air with carbon to reproduce the fluidized bed combustion. The influence of the relative velocity between PM and gas on the combustion rate was investigated. The effect of relative velocity was represented as the mass transfer coefficient of kinetic model. It is observed that the combustion rate shows Arrhenius behavior, and kinetic parameters were determined by fitting. The kinetic model was applied to the numerical simulations of the PM removal device. The numerical collection efficiency was in good agreement with the experimental data. PM adhesion and combustion characteristics were investigated in numerical simulations. It is observed that the adhesion rate is high at a low void fraction and that the combustion rate is high at a high relative velocity. The PM combustion amount is high for the high adhesion and combustion rates. The total combustion amount is determined to be 55% of the total amount of PM deposition after 180 min at each set of conditions.
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Excess heat evolution from nanocomposite samples under exposure to hydrogen isotope gases 査読あり
Kitamura A., Takahashi A., Takahashi K., Seto R., Hatano T., Iwamura Y., Itoh T., Kasagi J., Nakamura M., Uchimura M., Takahashi H., Sumitomo S., Hioki T., Motohiro T., Furuyama Y., Kishida M., Matsune H.
International Journal of Hydrogen Energy 43 ( 33 ) 16187 - 16200 2018年8月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：International Journal of Hydrogen Energy
© 2018 Hydrogen Energy Publications LLC Anomalous heat effect by interaction of hydrogen isotope gas and metal nanocomposites supported by zirconia or by silica has been examined. Observed absorption and heat evolution at RT were not too large to be explained by some chemical processes. At elevated temperatures of 200–300 °C, most samples with binary metal nanocomposites produced excess power of 3–24 W lasting for up to several weeks. The excess power was observed not only in the D-Pd·Ni system but also in the H–Pd·Ni system and H–Cu·Ni system, while single-element nanoparticle samples produced no excess power. The Pd/Ni ratio is one of the keys to increase the excess power. The maximum phase-averaged excess heat energy exceeded 270 keV/D, and the integrated excess heat energy reached 100 MJ/mol-M or 90 MJ/mol-H. It is impossible to attribute the excess heat energy to any chemical reaction; it is possibly due to radiation-free nuclear process.
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Effect of microwave attenuation in microwave plasma assisted combustion of biogas 査読あり
Yamamoto T., Uchiyama S., Matsune H., Kishida M.
23rd International Congress of Chemical and Process Engineering, CHISA 2018 and 21st Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2018 2 908 - 910 2018年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：23rd International Congress of Chemical and Process Engineering, CHISA 2018 and 21st Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2018
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Park K., Matsune H., Kishida M., Takenaka S.
International Journal of Hydrogen Energy 42 ( 30 ) 18951 - 18958 2017年7月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：International Journal of Hydrogen Energy
© 2017 Hydrogen Energy Publications LLC Carbon-supported Pd catalysts (Pd/CBs) for oxygen reduction reaction (ORR) in polymer electrolyte fuel cells (PEFCs) were modified with transition metals to enhance their catalytic activity. Pd-M/CB(N) (M = Co, Cu, Y, and Ag) was prepared by the reduction of metal precursors with NaBH4 in the presence of ethylene glycol (EG) without heat treatment. Pd-Ag/CB(N) showed the highest catalytic activity for the ORR among all the Pd-based catalysts tested in the present study, and it had twice higher activity than Pd/CB. The Pd-Ag/CB(N) also had the higher ORR activity than the Pd-Ag/CB prepared by a conventional impregnation method (Pd-Ag/CB(I)) due to the formation of smaller Pd-Ag alloy particles with 1–2 nm diameters. Pd-Ag/CB(N) was covered with silica layers (SiO2/Pd-Ag/CB(N)) in order to improve their durability under severe cathode conditions. The SiO2/Pd-Ag/CB(N) had high catalytic activity for the ORR during the durability test because silica layers prevented the diffusion of metal species from the catalysts.
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Reduction of selenate with hydrazine monohydrate over Pt catalysts in aqueous solution 査読あり
Zhao J., Matsune H., Takenaka S., Kishida M.
Chemical Engineering Journal 308 963 - 973 2017年1月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Chemical Engineering Journal
© 2016 Elsevier B.V. This paper describes the activity of Pt catalysts supported on metal-oxides (TiO2, ZrO2 and Al2O3) for the reduction reaction of selenate with hydrazine monohydrate in aqueous solution. The Pt/TiO2 catalyst exhibited superior performance in the reduction reaction of selenate with hydrazine monohydrate, compared with the Pt/ZrO2 and Pt/Al2O3 catalysts. The deactivation of Pt/TiO2 catalyst was attributed to the coverage of Pt particles by reduction product Se metal. To overcome this problem, a Pt catalyst supported on carbon nanotubes (CNTs) coated with TiO2 (TiO2/CNT) was also prepared. The selenate conversion over the Pt/TiO2/CNT catalyst was much higher than that over the Pt/TiO2 catalyst of the same Pt loading. Incorporating CNTs significantly improved the catalytic activity and durability of the Pt catalyst for the reduction of selenate.
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Yamamoto T., Uchiyama S., Matsune H., Kishida M.
11th Asia-Pacific Conference on Combustion, ASPACC 2017 2017-December 2017年
記述言語：日本語 掲載種別：研究論文（国際会議プロシーディングス） 出版者・発行元：11th Asia-Pacific Conference on Combustion, ASPACC 2017
© 2018 Combustion Institute. All Rights Reserved. To utilize biogas validly, we have applied plasma assisted combustion using microwave to the combustion and reformulation of biogas. In this study, the characteristics of combustion and reformulation of biogas have been investigated by comparing of large and small nozzle. In case of small nozzle, the combustion and reformulation of biogas stably occurs over a wider equivalence ratio area than that in case of large nozzle, because the damping of microwave is inhibited. N2and OH radical decrease, and H, CO, CH and C2radicals increase as equivalence ratio. H2and CO concentrations increase, and CO2concentration decreases with increasing equivalence ratio. In this method, since the reaction of CO2+ e → CO + O occurs, the amount of CO2of produced gas is less than the amount of supplied CO2in high equivalence ratio region. Cold gas efficiency increases with increasing H2and CO concentrations. When CH4is completely reformed into H2and CO, cold gas efficiency is about 95 %. However, the maximum value of cold gas efficiency is approximately 110 % at small nozzle, because CO2, which does not have calorific value, is decomposed into CO, which has calorific value.
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Modification of catalytic performance of supported Pt catalysts by coverage with silica layers 査読あり
Takenaka S., Akiyama R., Kim I., Matsune H., Kishida M.
Chemistry Letters 46 ( 6 ) 851 - 854 2017年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Chemistry Letters
© 2017 The Chemical Society of Japan. Supported Pt catalysts were covered with hydrophilic or hydrophobic silica layers. Both silica-coated Pt catalysts showed high tolerance to high-temperature sintering of Pt metal particles. The coverage with hydrophobic silica enhanced the activity of Pt catalysts for alkene hydrogenation in hydrophilic solvents.
DOI： 10.1246/cl.170194
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Zhao J., Matsune H., Takenaka S., Kishida M.
Chemical Engineering Journal 325 270 - 278 2017年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Chemical Engineering Journal
© 2017 Elsevier B.V. The pre-oxidation of arsenite (As(III)) to arsenate (As(V)) is a critical step for the removal of toxic arsenic in wastewater. In this work, a Pt catalyst supported on metal oxide was applied to the pre-oxidation step of As(III) without UV irradiation. It is demonstrated that Pt catalyst can effectively promote the oxidation of As(III) using oxygen at neutral pH due to the catalytic activity of Pt itself. The Pt/ZrO2 catalyst possessed excellent stability and could be used repeatedly with high catalytic performance. The oxidation rate of As(III) was structure-insensitive to Pt particle size and obeyed pseudo-first-order kinetics in As(III). The apparent activation energy was about 31.1 kJ/mol, which was obtained on the premise of order of 0.5 with respect to oxygen.
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Preparation of Metal Oxide Nanofilms Using Graphene Oxide as a Template 査読あり
Takenaka S., Miyake S., Uwai S., Matsune H., Kishida M.
Journal of Physical Chemistry C 119 ( 22 ) 12445 - 12454 2015年6月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Journal of Physical Chemistry C
© 2015 American Chemical Society. Two-dimensional (2D) materials have lately attracted significant attention, including nanosheets composed of metal oxide single crystallites that are typically prepared using a top-down synthesis method such as the exfoliation of layered metal oxides. In the present study, nanofilms composed of polycrystallites of metal oxides such as TiO<inf>2</inf>, ZrO<inf>2</inf>, Nb<inf>2</inf>O<inf>5</inf>, SnO<inf>2</inf>, and Ta<inf>2</inf>O<inf>5</inf> were prepared from the corresponding metal alkoxides using graphene oxide (GO) as a template, applying a bottom-up method. In this process, dried GO powder was dispersed in cyclohexane containing metal alkoxides and then treated at 453 K in an autoclave, such that the GO was converted into reduced GO (rGO) and metal oxide nanofilms were deposited on the rGO. Free-standing metal oxide nanofilms were subsequently obtained by calcination of the rGO/metal oxide composites in air at temperatures above 723 K. When dried GO was dispersed in cyclohexane containing metal alkoxides, the alkoxides adsorbed on the oxygen-containing functional groups of the GO were hydrolyzed by adsorbed or intercalated water in the dried GO and/or by water generated during the reduction of the GO, to form metal oxide nanofilms on the rGO. (Graph Presented).
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Takenaka S., Mikami D., Tanabe E., Matsune H., Kishida M.
Applied Catalysis A: General 492 60 - 67 2015年2月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Applied Catalysis A: General
© 2014 Elsevier B.V. All rights reserved. The surfaces of carbon nanotubes (CNTs) were covered with thin silica layers through the application of 3-aminopropyltriethoxysilane (APTES) in order to enhance the deposition of precious metal and transition metal oxide nanoparticles. Pt metal particles smaller than 2 nm in diameter could be deposited, using a conventional impregnation method, on CNTs coated with silica layers, whereas Pt particles supported on bare CNT surfaces were approximately 3 nm in diameter. Thus, coating CNTs with thin silica layers enhanced the catalytic activity of the Pt catalysts. In addition, CNTs with thin silica layers could be uniformly covered with transition metal oxide layers (ZrO2, Nb2O5 and Ta2O5) by hydrolysis of the corresponding metal alkoxides. In contrast, metal oxides were very difficult to deposit on bare CNTs. The thin silica layers produced on the CNTs via the use of APTES evidently function as adsorption sites for precursor metals and metal oxides, as well as nucleation sites for metals and metal oxides, allowing the formation of precious metal-CNT and transition metal oxide-CNT composites.
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Takenaka S., Miyazaki T., Matsune H., Kishida M.
Catalysis Science and Technology 5 ( 2 ) 1133 - 1142 2015年2月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Catalysis Science and Technology
© The Royal Society of Chemistry 2015. Carbon nanotube (CNT)-supported Pt catalysts (Pt/CNT) for use as cathode components in polymer electrolyte fuel cells (PEFCs) were covered with silica layers to prevent particle size increases during operation of the PEFC, either through the sintering of the Pt particles or the dissolution and redeposition of Pt ions. The formation of silica layers by the successive hydrolysis of 3-aminopropyltriethoxysilane (APTES) and tetraethoxysilane (TEOS) significantly improved the durability of the Pt/CNT catalysts under cathodic conditions, although the activity of the silica-coated material for the oxygen reduction reaction was slightly lower than that of the uncoated catalyst. In contrast, a silica-coated Pt/CNT catalyst prepared by the successive hydrolysis of APTES and TEOS in the presence of NH2-(CH2)n-NH2(n = 6, 8 and 10) exhibited both high catalytic activity and excellent durability. The NH2-(CH2)n-NH2added during the silica coating process worked as a template for the formation of micropores in the silica layers and the resulting pore structures enhanced the diffusion of both reactants and products during oxygen reduction on the silica-coated Pt/CNT catalysts.
DOI： 10.1039/c4cy01301h
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Zhao J., Matsune H., Takenaka S., Kishida M.
Chemistry Letters 44 ( 11 ) 1563 - 1565 2015年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Chemistry Letters
© 2015 The Chemical Society of Japan. Although there has been no report on the catalytic reaction of selenate over heterogeneous catalysts in aqueous solution, we found that titania-supported Pt catalysts exhibited significantly high activity for the reduction of selenate with hydrazine. The Pt catalysts were deactivated during the reaction because of the deposition of Se metal, but showed excellent reusability. Therefore, it was firstly demonstrated that heterogeneous catalysts are effective for the removal of selenate from aqueous solution.
DOI： 10.1246/cl.150695
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Takenaka S., Miyamoto H., Utsunomiya Y., Matsune H., Kishida M.
Journal of Physical Chemistry C 118 ( 2 ) 774 - 783 2014年1月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Journal of Physical Chemistry C
Carbon nanotube-supported Pt catalysts (Pt/CNT) for the cathode in a polymer electrolyte fuel cell (PEFC) were covered with silica layers using tetraethoxysilane (TEOS) and also methyltriethoxysilane (MTEOS) to improve the catalyst durability under the severe conditions at the PEFC cathode. Both the silica-coated Pt/CNT catalysts had excellent durability for potential cycling between 0.6 and 1.0 V (vs RHE) in N2-purged 0.1 M HClO4 electrolyte, while Pt/CNT without silica coating was significantly deactivated due to an increase of the Pt metal particle size. Silica-coated Pt/CNT prepared from MTEOS had similar activity for the oxygen reduction reaction as Pt/CNT without silica coating, whereas the silica coverage obtained with TEOS slightly reduced the catalytic activity of the Pt/CNT catalyst. The silica layers prepared from MTEOS are more hydrophobic than those prepared from TEOS due to the presence of methyl groups. In addition, the silica layers prepared from MTEOS have larger pores than those prepared from TEOS. The hydrophobic silica layers with larger pores in the silica-coated Pt/CNT do not inhibit the diffusion of the reactants (oxygen) and the discharge of the products (water) during the oxygen reduction reaction. © 2013 American Chemical Society.
DOI： 10.1021/jp407928m
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Synthesis of silica-coated AgCl nanoparticles in aqueous poly(vinylpyrrolidone) solution 査読あり
Masuda K., Matsune H., Takenaka S., Kishida M.
Bulletin of the Chemical Society of Japan 87 ( 4 ) 573 - 575 2014年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Bulletin of the Chemical Society of Japan
Silica-coated AgCl nanoparticles are successfully prepared in an aqueous solution. AgCl nanoparticles are synthesized using poly(vinylpyrrolidone) as a protecting agent, and a silica layer is formed by hydrolysis and polycondensation of (3-aminopropyl)-triethoxysilane (APTS) and tetraethoxysilane. The results explain that APTS is a key material for the formation of the silica layer in the aqueous solution system. © 2014 The Chemical Society of Japan.
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Kurinobu S., Chigira O., Matsune K., Miura M., Naiem M.
Silvae Genetica 62 ( 1-2 ) 44 - 51 2013年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Silvae Genetica
Nine provenances of Albizia falcataria were planted at three square spacing levels (2, 3, and 4 m) in a split-plot design at Jember in East Java, Indonesia and measured annually for six years, which is three quarters of its rotation age. The effect of spacing on mean height development became progressively evident, due to the decline in growth at closer spacing caused by intensified competition, in six provenances, i.e., three provenances each from Java and East Indonesia, which were considered better adapted to the site because of their better growth and higher survival. On the contrary, the height growth curves of two provenances from New Guinea were almost identical, irrespective of spacing, indicating a lack of plasticity to the favorable environment at wider spacing. Dominant height was defined as the average of the five tallest trees per sub-plot (350 stems/ha), the growth curves at the three spacing levels were similar in the above-mentioned six provenances and were regarded as a single curve according to AIC-values. In contrast, dominant height growth curves of the New Guinea provenances were differentiated in the order of 2, 3, and 4 m spacing, approximately proportional to the intensity of choosing dominant trees per sub-plot. These results suggest that provenance variation exists for mean and dominant height and their response to different spacing. The cause of this variation was presumably attributable to the difference in competitive ability as well as the plasticity to the given environment. The use of dominant height for growth modeling of A. falcataria was found to be the most suitable for the adapted provenances.
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Bottom-up synthesis of titania and zirconia nanosheets and their composites with graphene 査読あり
Takenaka S., Uwai S., Ida S., Matsune H., Kishida M.
Chemistry Letters 42 ( 10 ) 1188 - 1190 2013年10月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Chemistry Letters
Simple impregnation of graphene oxide (GO) in cyclohexane containing Ti(OC4H9)4 or Zr(OC4H 9)4, followed by a solvothermal reaction, resulted in the deposition of nanosheets of TiO2 or ZrO2 a few nanometers thick on the reduced GO. In addition, free-standing nanosheets of TiO 2 or ZrO2 were formed by calcination of these composites in air. © 2013 The Chemical Society of Japan.
DOI： 10.1246/cl.130587