Degree 【 display / non-display 】

Degree 【 display / non-display 】

Research Areas 【 display / non-display 】

Research Areas 【 display / non-display 】

Research Career 【 display / non-display 】

Research Career 【 display / non-display 】

• Development of micro-porous ceremics for VSC adsorption

  (Collaboration in Japan) Project Year :

  2006

  -

  Today

  Keyword in research subject:  nano material, micro-porous ceramics

• Superparamagnetic nano particles embedded on hydroxyapatite

  (International Collaboration) Project Year :

  2012.04

  -

  Today

  Keyword in research subject:  superparamagnetic nano particle, hydroxyapatite

• Deveplopment of novel bio-active cement materials

  (Collaboration in Organization) Project Year :

  2011.04

  -

  Today

  Keyword in research subject:  calcium phosphate, bio-active cement, bone filler

• Nanotube array sheet as photocatalyst in visual light

  (Collaboration in Japan) Project Year :

  2006.04

  -

  Today

  Keyword in research subject:  nanotube, visual light responsibilty

• Development of CPC materials for medical application

  (International Collaboration) Project Year :

  2006.04

  -

  Today

  Keyword in research subject:  Biomaterial

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Current Career 【 display / non-display 】

Current Career 【 display / non-display 】

Career 【 display / non-display 】

Career 【 display / non-display 】

Graduate School 【 display / non-display 】

Graduate School 【 display / non-display 】

Graduating School 【 display / non-display 】

Graduating School 【 display / non-display 】

Published Papers 【 display / non-display 】

Published Papers 【 display / non-display 】

• First-Principles Calculations of Ionic Conduction in Olivine-Type Li<i>_x</i>FePO₄

  Kishida Ippei, Koyama Shota, Yokogawa Yoshiyuki

  公益社団法人 日本金属学会　MATERIALS TRANSACTIONS  2018  [Refereed]

   View Summary

  <p>Super ionic conductors are required for all solid Li ion batteries. Conduction mechanism of Li<i>_x</i>FePO₄ has been revealed by first-principles calculations using plane-wave basis. Crystal structures were constructed using a unit cell and a 1 × 2 × 1 super cell. Transition of Li site occupation with the smallest energy fluctuation was searched through graph theory. Trajectories of Li ions and migration energies were obtained by Nudged Elastic Band Method. Results show the migrating atoms pass through faces of O polyhedra. At dilute limit of Li, a single ion migrated and had very low migration energy of 0.14 eV. Increasing the carrier concentration resulted in pairing of Li atoms and raised the migration energy. At higher concentration region, cooperative ionic conduction mechanisms of two Li ions occurred. Low migration energies were obtained to be 0.20 and 0.22 eV for <i>x</i> = 0.25 and 0.5 of Li<i>_x</i>FePO₄, respectively. Considering the migration energy and carrier concentration, Li<i>_x</i>FePO₄ with the concentration region 0.25 ≤ <i>x</i> ≤ 0.5 should have high ionic conductivity. These mechanisms would be applied to develop new superionic conductors.</p>

  DOI CiNii

• TEM observation of heat-treatedβ-tricalcium phosphate powder and its precursor obtained by mechanochemical reaction

  Atsumasa Shishido, Yoshiyuki Yokogawa

  Key Engineering Materials  759   184 - 188 2017.10  [Refereed]

• Protein Adsorption on Spark Plasma Sintered Mesoporous Silicate Compacts

  Yoshiyuki Yokogawa *, Ryota Fumimoto, Suguru Inamura

  Key Engineering Materials  758   14 - 18 2017.10  [Refereed]

• Silica Interlayer Formation of Mesoporous Silica Coatings on Hydroxyapatite Granules"

  Yoshiyuki Yokogawa, Atsumasa Shishido, K. Hiroyasu

  Key Engineering Materials  758   19 - 23 2017.10  [Refereed]

• Kinetic modelling of cytochrome c adsorption on SBA-15

  Yokogawa Yoshiyuki, Yamauchi Rie, Saito Akira, Yamato Yuta, Toma Takeshi

  BIO-MEDICAL MATERIALS AND ENGINEERING  28 ( 1 ) 37 - 46 2017.04  [Refereed]

  DOI

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Books etc 【 display / non-display 】

Books etc 【 display / non-display 】

• Fabrication of hydroxyapatite calcite nanocomposite

  E.K. Girija, G. Suresh Kumar, A. Thamizhavel, Y. Yokogawa, S.Narayana Kalkura, R. Narayan (Part： Joint Work )

  Advances in Bioceramics and Porous Ceramics IV: Ceramic Engineering and Science Proceedings  2011

• Synthesis and characterization of bioactive hydroxyapatite–calcite Nanocomposite for biomedical applications

  G.SureshKumar, E.K.Girija, A.Thamizhavel, Y.Yokogawa (Part： Joint Work )

  Journal of Colloid and Interface Science  2010

• Synthesis and physico-chemical properties of zinc and carbonate co-substituted nano-hydroxyapatite for biomedical applications

  G. Suresh Kumar, E.K. Girija, A. Thamizhavel, Y. Yokogawa, S. Narayana Kalkura (Part： Joint Work )

  Macmillan Publisher India Limited// Biomedical Applications of Nanostructured Materials  2010

• Advanced Mechanical Properties of Porous Hydroxyapatite Ceramics Prepared Using Hydroxyapatite Slip and its Slurry Synthesis

  (Part： Joint Work )

  2007

• Novel Synthesis of Calcium Phosphate Ceramics and Composite from Bioactive to Bio-functional Integration

  -Yoshiyuki Yokogawa (Part： Single Work )

  Phosphorous Research Bulletine  2006

Review Papers (Misc) 【 display / non-display 】

Review Papers (Misc) 【 display / non-display 】

• Research on Inorganic Materials in Japan

  Klei Glas Keramiek  25 ( 5 ) 17 - 24 2004

Conference Activities & Talks 【 display / non-display 】

Conference Activities & Talks 【 display / non-display 】

• Neutral Liquid containing Chitosan and Polyol for Calcium Phosphate Cement

  Yoshiyuki Yokokawa, Ryota Izumiki, Shu Senga, Seiya Shibata

  17th Asian Bioceramics Symposium  2017.11 

• In vitro Biocompatibility of Nano Cobalt Oxide embedded Hydroxyapatite

  Yoshiyuki Yokogawa, Yuichiro Iguchi

  17th Asian Bioceramics Symposium 2017  2017.11 

• TEM observation of heat-treated b-tricalcium phosphate powder and its precursor obtained by mechanochemical reaction

  Atsumasa Shishido1, Yoshiyuki Yokogawa

  Bioceramics29  2017.10 

• Protein adsorption on spark plasma sintered mesoporous silicate compacts

  Y.Yokogawa, R.Fumimoto, and S,Inamura

  Bioceramics29  2017.10 

• Silica Interlayer Formation of Mesoporous Silica Coatings on Hydroxyapatite Granules

  Y.Yokogawa, A.Shishido, and K.Hiroyasu

  Bioceramics29  2017.10 

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Other educational activity and Special note 【 display / non-display 】

Other educational activity and Special note 【 display / non-display 】

• Contribution to FD activities

  (2012)

Educational activity record 【 display / non-display 】

Educational activity record 【 display / non-display 】

• Academic year : 2012

   View Details

  Number of instructed the graduation thesis

  7

  Number of graduation thesis reviews

  7

  Number of instructed the Master course

  11

  Number of instructed the Doctoral course

  0

  Number of master's thesis reviews (chief)

  6

  Number of master's thesis reviews (vice-chief)

  3

  Number of doctoral thesis reviews (chief)

  0

  Number of doctoral thesis reviews (vice-chief)

  0

Theme of Possible Research Exchange 【 display / non-display 】

Theme of Possible Research Exchange 【 display / non-display 】

• Water purification system using carrier for enzyme

  Request for collaborative research : The private sector, such as other institutions

  Type of research exchange : Technical consultation, Consignment study, Collaborative research, Lecture

Foreigner acceptance 【 display / non-display 】

Foreigner acceptance 【 display / non-display 】

• Academic year : 2014

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  Number of foreigners accepted

  1

  Number of International Students

  1