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Affiliation |
Graduate School of Engineering Science Department of Materials Science Applied Chemistry Course |
MURAKAMI Kenji
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Graduating School 【 display / non-display 】
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1987.04-1991.03
Tohoku University Graduated
Graduate School 【 display / non-display 】
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-1995.03
Tohoku University Graduate School, Division of Engineering Doctor's Course Unfinished Course
Campus Career 【 display / non-display 】
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2016.04-Now
Akita University Graduate School of Engineering Science Department of Materials Science Applied Chemistry Course Graduate School of Engineering Science Professor
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2013.04-2016.03
Akita University Graduate School of Engineering and Resource Science Department of Materials-process Engineering and Applied Chemistry Environ Faculty of Engineering and Resource Science Professor
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2010.04-2013.03
Akita University Graduate School of Engineering and Resource Science Department of Materials-process Engineering and Applied Chemistry Environ Faculty of Engineering and Resource Science Associate Professor
Thesis for a degree 【 display / non-display 】
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Study on the ion-exchange property of brown coal and its application
Kenji Murakami
1997.12
Single author
Research Achievements 【 display / non-display 】
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Ayano Nakamura, Hiromu Sato, Yusuke Sato, Kenji Murakami
Colloids and Surfaces A: Physicochemical and Engineering Aspects ( Elsevier ) 603 125265 - 125265 2020.10 [Refereed]
Research paper (journal) Domestic Co-author
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Ayano Nakamura, Maki Ozaki, Kenji Murakami
Colloids and Surfaces A: Physicochemical and Engineering Aspects ( Elsevier ) 596 124660 - 124660 2020.07 [Refereed]
Research paper (journal) Domestic Co-author
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Synthesis of temperature-responsive magnetic mesoporous silica and temperature dependence of its physical properties
Ryosuke Sugawara, Ayano Nakamura, Kenji Murakami
Colloids and Surfaces A: Physicochemical and Engineering Aspects ( Elsevier ) 591 124465 2020.04 [Refereed]
Research paper (journal) Domestic Co-author
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Dissolution of solvent-extracted rice straw in kerosene by catalytic hydrocracking
Kenji Murakami, Shin Kumagai, Takahiro Oga, Ayano Nakamura, Katsuyasu Sugawara
Global Journal of Engineering Science and Research Management 7 ( 4 ) 42 - 50 2020.04 [Refereed]
Research paper (journal) Domestic Co-author
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Preparation and Characterization of Light-Shielding Gel Sheet Using Thermoresponsive Polymer
OGAI Ryohei, NAKAMURA Ayano, SATO Yusuke, MURAKAMI Kenji
Journal of the Society of Materials Science, Japan ( The Society of Materials Science, Japan ) 69 ( 4 ) 329 - 333 2020.04 [Refereed]
Research paper (journal) Domestic Co-author
<p>This study aims to develop a new light-shielding gel sheet, which can change its transparency and opaqueness reversibly in response to temperature with little volume change, composed of poly <i>N</i>-isopropyl acrylamide (PNIPAM), which is a temperature responsive polymer with a lower critical solution temperature(LCST)of 32°C, and agar. For this purpose, the influence of PNIPAM concentration(0.6-6 wt%)and agar concentration(0.6-3 wt%)on the transmittance of visible and near infrared light and volume shrinkage ratio of PNIPAM gel sheet during heating and cooling were investigated. Furthermore, the structural change of PNIPAM gel sheet with temperature change was discussed from these results. The transmittance of PNIPAM gel sheet increased at 25°C(below LCST)and decreased at 50°C(above LCST)with the increase of PNIPAM concentration and the decrease of agar concentration. In addition, the volume shrinkage ratio of PNIPAM gel sheet by heating decreased when the agar concentration increased. These results reveal that the PNIPAM gel sheet prepared with 6 wt% of PNIPAM and 2 wt% of agar has the highest performance.</p>
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Influence of Particle Size of Carbon Materials and Oxygen Concentration on the Combustion Rates
Murakami Kenji, Watanabe Ryo, Matsuhashi Emiri, Nakamura Ayano, Takehara Kenta, Higuchi Takahide, Matsumura Masaru
Tetsu-to-Hagane ( The Iron and Steel Institute of Japan ) 107 ( 6 ) 422 - 430 2021.06
<p>To reduce the amount of CO<sub>2</sub> evolution in iron ore sintering process, it is considered to replace a part of coke and anthracite, which are agglomeration agent, with biomass char. However, it is unclear how the particle size of biomass char and the oxygen concentration affect the combustion rate. The purpose of this study is to measure the combustion rate when PKS (Perm Kernel Shell) char and coke breeze with various particle sizes of 0.15-0.25, 0.6-1, 1-3 mm were combusted at a temperature of 400-800°C under 1-5 vol% of oxygen. The combustion rate in the chemical reaction rate-determining step (low temperature region) was analyzed by the Arrhenius equation. It was found that the apparent activation energy was 110-120 kJ/mol for PKS char and 140-150 kJ/mol for coke breeze independent of oxygen concentration and particle size. On the other hand, the frequency factor decreased with increasing particle size. As a result, the combustion rate decreased slightly with increasing particle size. The combustion rate in the diffusion-controlled step (high temperature region) was analyzed by an equation considering the gas diffusion and the pore structure of carbonaceous material. The proposed equation fitted the measured combustion rate well for particle size of 1-3 mm. However, when the particle size was small, the correction factor must be introduced to the equation of combustion rate. Because the combustion rate of PKS char is high even at low oxygen concentration, it is preferable to place the PKS char in the lower layer of the sintering bed.</p>
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Liquid fuel production with high calorific value from biomass by degradative solvent extraction using deep eutectic solvent
Pedro Domingos DAUCE, Ayano NAKAMURA, Kenji MURAKAMI
第57回石炭科学会議（オンライン） 2-20 2020.10
Summary of the papers read (national conference and other science council) Domestic Co-author
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Preparation and evaluation of temperature-responsive light shielding gel
P.137 2019.06
Summary of the papers read (international conference) Domestic Co-author
◆Original paper【 display / non-display 】
◆Other【 display / non-display 】
Grant-in-Aid for Scientific Research 【 display / non-display 】
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Grant-in-Aid for Scientific Research(C)
Project Year： 2015.04 - 2018.03
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Grant-in-Aid for Scientific Research(C)
Project Year： 2012.04 - 2015.03
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Grant-in-Aid for Exploratory Research
Project Year： 2009.04 - 2012.03
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Grant-in-Aid for Young Scientists(B)
Project Year： 2005.04 - 2008.03
Presentations 【 display / non-display 】
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Synthesis of temperature-responsive polymer/magnetite/zeolite and application to high gradient magnetic separation
○Kenji Murakami, Ayano Nakamura
9th International Colloids Conference (COLL2019, Sitges, Spain) (Sitges, Spain) 2019.06 - 2019.06
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Hydrogenation of solvent-extracted rice straw by zeolite catalyst
○Kenji Murakami, Shin Kumagai, Ayano Nakamura, Katsuyasu Sugawara
7th International Conference on Sustainable Energy and Environment (SEE2018) (Bangkok, Thailand) 2018.11 - 2018.11
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Catalytichydrogenation of degradative solvent-extracted rice straw
○Kenji Murakami, Shin Kumagai, Ayano Nakamura, Katsuyasu Sugawara
23rd InternationalCongress of Chemical and Process Engineering (CHISA 2018) (Prague, Czech) 2018.08 - 2018.08