OHGAI Takeshi

J-GLOBAL         Last updated: Mar 18, 2019 at 22:10
 
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Name
OHGAI Takeshi
E-mail
ohgainagasaki-u.ac.jp
URL
http://www.mase.nagasaki-u.ac.jp
Affiliation
Nagasaki University
Section
Graduate school of Engineering
Job title
Associate Professor
Degree
Doctor (Engineering)(Kyushu University), Master (Engineering)(Kyushu University)
Research funding number
60253481

Research Areas

 
 

Academic & Professional Experience

 
Apr 1993
 - 
Mar 1999
Research Associate, Faculty of Engineering, Kyushu University
 
Apr 1999
 - 
Mar 2002
Research Associate, Graduate School of Engineering, Kyushu University
 
Apr 2001
 - 
Mar 2002
Visiting Researcher, Department of Physics, Ecole Polytechnique Federale de Lausanne (EPFL)
 
Apr 2002
 - 
Mar 2003
Researcher, Department of Physics, Ecole Polytechnique Federale de Lausanne (EPFL)
 
Sep 2003
 - 
Feb 2004
Researcher, Department of Materials Science, Gesellschaft für Schwerionenforschung (GSI)
 
Mar 2004
 - 
Mar 2007
Associate Professor, Faculty of Engineering, Nagasaki University
 
Aug 2006
 - 
Sep 2006
Visiting Researcher, The Ångström Laboratory, Uppsala University, Sweden
 
Apr 2007
 - 
Mar 2011
Associate Professor, Division of Materials and Chemical Research,Faculty of Engineering, Nagasaki University
 
Apr 2011
 - 
Today
Associate Professor, Division of Chemistry and Materials Science,Graduate school of Engineering, Nagasaki University
 
Apr 2015
 - 
Sep 2015
Part‐time Lecturer, Faculty of Engineering, Kyushu University
 

Education

 
Apr 1987
 - 
Mar 1991
Metallurgy, Faculty of Engineering, Kyushu University
 
Apr 1991
 - 
Mar 1993
Ferrous Metallurgy, Graduate School of Engineering, Kyushu University
 

Committee Memberships

 
Apr 2015
 - 
Today
Journal of Nanoelectronics and Optoelectronics (American Scientific Publishers)  Associate Editor
 
Apr 2008
 - 
Today
International Journal of Applied Sciences (CSC Journals)  Editorial Board Member
 
Apr 2012
 - 
Today
The Mining and Materials Processing Institute of Japan  Editorial Board Member
 
Apr 2006
 - 
Today
The Surface Finishing Society of Japan  Editorial Board Member
 

Published Papers

 
Ryusei Saeki, Takeshi Ohgai
Crystals   9(3) 142.(1)-142.(14)   Mar 2019   [Refereed]
© 2019 by the authors. Licensee MDPI, Basel, Switzerland. The time-dependence of electrochemical reduction current, which was observed during the one-dimensional (1-D) crystal growth of ferromagnetic cobalt nanowire arrays, was analyzed by Johnson...
Ryusei Saeki, Takeshi Ohgai
Materials   11(12) 2355.(1)-2355.(13)   Nov 2018   [Refereed]
© 2018 by the authors. Licensee MDPI, Basel, Switzerland. The crystal growth process and ferromagnetic properties of electrodeposited cobalt nanowires were investigated by controlling the bath temperature and cathodic overpotential. The cathodic o...
Ryusei Saeki, Takeshi Ohgai
Nanomaterials   8(8) 566.(1)-566.(13)   Aug 2018   [Refereed]
© 2018 by the authors. Licensee MDPI, Basel, Switzerland. The formation work of a two-dimensional hcp-Co (metallic cobalt crystal with hexagonal close packed structure) nucleus, Whkl, was calculated by Pangarov’s theory. W002was estimated to be sm...
C. Neetzel, T. Ohgai, T. Yanai, M. Nakano, H. Fukunaga
Nanoscale Research Letters   12 598.(1)-598.(8)   Jan 2017   [Refereed]
© 2017, The Author(s). Textured ferromagnetic Fe nanowire arrays were electrodeposited using a rectangular-pulsed potential deposition technique into anodized aluminum oxide nanochannels. During the electrodeposition of Fe nanowire arrays at a cat...
T. Yanai, K. Furutani, T. Masaki, T. Ohgai, M. Nakano, H. Fukunaga
AIP Advances   6    May 2016
© 2016 Author(s). Fe-Pt thick-films were electroplated on a Ta substrate using a direct current, and the effect of the pH value of the plating bath on the magnetic properties of the films was evaluated. For the films prepared from the baths with t...
T. Yanai, K. Azuma, K. Eguchi, Y. Watanabe, T. Ohgai, M. Nakano, H. Fukunaga
AIP Advances   6    May 2016
© 2016 Author(s). We have already reported that Fe-Ni films prepared in citric-acid-based plating baths show good soft magnetic properties. In this paper, we investigated the effect of the grain size of the Fe-Ni crystalline phase in the films on ...
Takeshi Yanai, Kotaro Shiraishi, Toshiki Akiyoshi, Keita Azuma, Yoshimasa Watanabe, Takeshi Ohgai, Takao Morimura, Masaki Nakano, Hirotoshi Fukunaga
AIP Advances   6    May 2016
© 2016 Author(s). We fabricated soft magnetic films from DES-based plating baths, and investigated magnetic properties of the plated films. The plating baths were obtained by stirring the mixture of choline chloride, ethylene glycol, FeCl2× 4H2O, ...
C. Neetzel, T. Ohgai, T. Yanai, M. Nakano, H. Fukunaga
Journal of Solid State Electrochemistry   20 1665-1672   Jan 2016
© 2016, Springer-Verlag Berlin Heidelberg. In this study, Co-Al2O3nano-composite films containing parallel-oriented cobalt nano-cylinders with length-to-diameter aspect ratios of ca. 4000 are synthesized to acquire a uniaxial magnetization propert...
C. Neetzel, F. Muench, T. Matsutani, T. Matsutani, J. C. Jaud, J. Broetz, T. Ohgai, W. Ensinger
Sensors and Actuators, B: Chemical   214 189-196   Jul 2015
© 2015 Elsevier B.V. All rights reserved. Abstract In this work, different facile synthesis routes were developed to create cuprite-based catalyst systems for the amperometric detection of glucose, allowing us to evaluate the impact of important e...
Y. Watanabe, T. Yanai, M. Otsubo, A. Takahashi, T. Ohgai, M. Nakano, K. Suzuki, H. Fukunaga
Journal of Applied Physics   117    May 2015
© 2015 AIP Publishing LLC. Fe-Ni films were electroplated in a citric-acid-based plating bath, focusing on the current efficiency of the plating process. We prepared the plating baths with various citric acid contents, and evaluated the magnetic p...

Books etc

 
Nanowires - Recent Advances
IN-TECH   Dec 2012   ISBN:980-953-307-525-4
Magnetoresistance of Nanowires Electrodeposited into Anodized Aluminum Oxide Nanochannels, Chapter.6, pp.101-125
Electrodeposited Nanowires and Their Applications
IN-TECH   Feb 2010   ISBN:978-953-7619-88-6
Fabrication of Functional Metallic Nanowires Using Electrodeposition Technique, Chapter.3, pp.61-84 (2010)
Next-Generation Actuators Leading Breakthroughs
Springer   Jan 2010   ISBN:978-1-84882-990-9
Development of Actuator Utilizing Hydrogen Storage Alloys, Chapter.29, pp.337-349 (2010)

Conference Activities & Talks

 
TMS-2015 (2015 TMS Annual Meeting & Exhibition on Functional Nanomaterials: Energy and Sensing)   2015   
TMS-2015 (2015 TMS Annual Meeting & Exhibition on Functional Nanomaterials: Energy and Sensing)   2015   
PRICM-8 (The 8th Pacific Rim International Conference on Advanced Materials and Processing)   2013   
PRICM-8 (The 8th Pacific Rim International Conference on Advanced Materials and Processing)   2013   
PRiME2012 (2012 Pacific Rim Meeting on Electrochemical and Solid-State Science)   2012   
PRiME2012 (2012 Pacific Rim Meeting on Electrochemical and Solid-State Science)   2012   
ICTF-15 (The 15th International Conference on Thin Films)   2011   
ICTF-15 (The 15th International Conference on Thin Films)   2011   
ICTF-15 (The 15th International Conference on Thin Films)   2011   
PRICM-7 (The 7th Pacific Rim International Conference on Advanced Materials and Processing)   2010   

Research Grants & Projects

 
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