Research Interests 【 display / non-display 】

Research Interests 【 display / non-display 】

Graduating School 【 display / non-display 】

Graduating School 【 display / non-display 】

• 1987.04

  -

  1991.03

  Tohoku University     Graduated

Graduate School 【 display / non-display 】

Graduate School 【 display / non-display 】

• 　

  -

  1995.03

  Tohoku University  Graduate School, Division of Engineering  Doctor's Course  Unfinished Course

Campus Career 【 display / non-display 】

Campus Career 【 display / non-display 】

• 2013.04

  -

  Now

  Akita University   Abolished organization   Department of Materials-process Engineering and Applied Chemistry Environ   Faculty of Engineering and Resource Science   Professor  

• 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 】

Thesis for a degree 【 display / non-display 】

• Study on the ion-exchange property of brown coal and its application

  Kenji Murakami 

    1997.12

  Single author

Research Achievements 【 display / non-display 】

Research Achievements 【 display / non-display 】

◆Original paper【 display / non-display 】

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◆Original paper【 display / non-display 】

Effects of calcium chloride and poly(N,N-dimethylaminoethyl methacrylate) on the filtration rate of a bentonite suspension and the examination of the filtration mechanism

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

DOI

Elucidation of the aggregation mechanism of bentonite with cationic guar gum as flocculant and application to filtration

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

DOI

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

DOI

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

DOI

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>

DOI

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◆Other【 display / non-display 】

To the head of this page.▲

◆Other【 display / non-display 】

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 CO₂ 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>

DOI

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

Preparation and evaluation of temperature-responsive light shielding gel

  P.137   2019.06

Summary of the papers read (international conference)   Domestic Co-author

Grant-in-Aid for Scientific Research 【 display / non-display 】

Grant-in-Aid for Scientific Research 【 display / non-display 】

• Grant-in-Aid for Scientific Research(C)

  Project Year： 2015.04  -  2018.03 

• Grant-in-Aid for Scientific Research(C)

  Project Year： 2012.04  -  2015.03 

• Grant-in-Aid for Exploratory Research

  Project Year： 2009.04  -  2012.03 

• Grant-in-Aid for Young Scientists(B)

  Project Year： 2005.04  -  2008.03 

Presentations 【 display / non-display 】

Presentations 【 display / non-display 】

• 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 

• 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 

• 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