OKA Ryohei

写真a

Affiliation Department etc.

Department of Life Science and Applied Chemistry
Department of Life Science and Applied Chemistry
Center for Innovative Young Researchers

Title

Assistant Professor

Graduating School

  • 2012.04
    -
    2016.03

    Tottori University   Faculty of Engineering   Graduated

Graduate School

  • 2018.04
    -
    2021.03

    Tottori University  Graduate School, Division of Engineering  Doctor's Course  Completed

  • 2016.04
    -
    2018.03

    Tottori University  Graduate School, Division of Engineering  Master's Course  Completed

External Career

  • 2018.04
    -
    2021.03

      Special researcher of the Japan Society for the Promotion of Science  

 

Thesis for a degree

  • Studies on Novel Environment-Friendly Inorganic Pigments

    Ryohei Oka 

      2021.03  [Refereed]

    8   1

Papers

  • Novel Near-Infrared Reflective Black Inorganic Pigment Based on Cerium Vanadate

    Takuro Morimoto, Ryohei Oka, Kohei Minagawa, Toshiyuki Masui

    RSC Advances ( Royal Society of Chemistry )  12 ( 26 ) 16570 - 16575   2022.06  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Raman Spectroscopic Investigation and Electronic States Calculation for Ca2(Mn,Ti)O4 Black Pigments with High Near-Infrared (NIR) reflectivity

    Ryohei Oka, Tomokatsu Hayakawa

    Inorganic Chemistry ( American Chemical Society )  61 ( 17 ) 6500 - 6507   2022.04  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Novel Findings on Optical Properties of Mn4+-Doped (Rb,K)2Ge4O9 Phosphors

    Ryohei Oka, Daiki Nishi, Tomokatsu Hayakawa

    Physica Status Solidi B ( Wiley )    2100615   2022.02  [Refereed]  [Invited]

    Research paper (scientific journal)   Multiple Authorship

  • Novel Inorganic Orange Pigments Based on BiFeWO6

    Ryohei Oka, Akari Takemura, Yusuke Shobu, Kohei Minagawa, Toshiyuki Masui

    Journal of the Ceramic Society of Japan ( The Ceramic Society of Japan )  130 ( 1 ) 39 - 43   2022.01  [Refereed]  [Invited]

    Research paper (scientific journal)   Multiple Authorship

  • Novel Orange Color Pigments Based on La3LiMnO7

    Ryohei Oka, Jun-ichi Koyama, Takuro Morimoto, Toshiyuki Masui

    Molecules ( MDPI )  26 ( 20 ) 6243   2021.10  [Refereed]  [Invited]

    Research paper (scientific journal)   Multiple Authorship

  • Synthesis and Characterization of Ca1−xEuxZrO3 as Environmentally Friendly Inorganic Yellow Pigments

    Kohei Minagawa, Yuichi Nishiguchi, Ryohei Oka, Toshiyuki Masui

    ACS Omega ( American Chemical Society )  6 ( 4 ) 3411 - 3417   2021.01  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Effect of [MnO6] Octahedra to the Coloring Mechanism of (Li1−xNax)2MnO3

    Ryohei Oka, Kohei Kusukami, Toshiyuki Masui

    ACS Omega ( American Chemical Society )  5 ( 22 ) 13108 - 13114   2020.05  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Improvement of Near-infrared (NIR) Reflectivity and Black Color Tone by Doping Zn2+ into the Ca2Mn0.85Ti0.15O4 Structure

    Ryohei Oka, Senri Iwasaki, Toshiyuki Masui

    RSC Advances ( Royal Society of Chemistry )  9 ( 66 ) 38822 - 38827   2019.11  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Submicron-Sized Phosphors Based on Hexagonal Rare Earth Oxycarbonate for Near-infrared Excitation and Emission

    Mizuki Watanabe, Yasuhiro Sejima, Ryohei Oka, Shintaro Ida, Toshiyuki Masui

    Journal of Asian Ceramic Societies ( Taylor and Francis Group )  7 ( 4 ) 502 - 508   2019.10  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Enhancement of Near-infrared Emission of Neodymium-Doped Monoclinic Gadolinium Phosphate Nanophosphors by Surface Coating with Calcium Phosphate

    Mizuki Watanabe, Norifumi Yamamoto, Tomoaki Matsuo, Ryohei Oka, Shintaro Ida, Toshiyuki Masui

    Journal of Asian Ceramic Societies ( Taylor and Francis Group )  7 ( 4 ) 509 - 517   2019.10  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

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Presentations

  • Raman Investigation for Near-Infrared (NIR) Reflective Black Pigments Based on Ca2(Mn,Ti)O4

    Ryohei Oka, Tomokatsu Hayakawa

    3rd International Conference on Materials Science & Engineering (Materials-2022)  (Boston, MA | Hybrid)  2022.04  -  2022.04  United Scientific Group

  • Mn4+添加(K,Rb)2Ge4O9赤色蛍光体の合成と発光特性

    西 大輝,岡 亮平,早川 知克

    日本セラミックス協会2022年年会  (on Web)  2022.03  -  2022.03  公益社団法人日本セラミックス協会

  • Characterization of environmentally friendly inorganic pigments with near-infrared (NIR) reflective properties

    Ryohei Oka, Tomokatsu Hayakawa  [Invited]

    46th International Conference and Expo on Advanced Ceramics and Composites (ICACC2022)  (on Web)  2022.01  -  2022.01  The American Ceramic Society

  • Synthesis and Characterization of (Li1−xNax)2MnO3 as Environmentally Friendly Red Pigments

    Kohei Kusukami, Ryohei Oka, Toshiyuki Masui

    The 36th International Japan-Korea Seminar on Ceramics (JK-Ceramics 36)  (Tottori)  2019.11  -  2019.11 

  • Novel Inorganic Black Pigments Based on Ca2MnO4 for High Near-Infrared Reflectance

    Ryohei Oka, Senri Iwasaki, Toshiyuki Masui

    The 36th International Japan-Korea Seminar on Ceramics (JK-Ceramics 36)  (Tottori)  2019.11  -  2019.11 

  • Synthesis and Color Evaluation of Ta5+-doped Bi2O3

    Yusuke Shobu, Ryohei Oka, Toshiyuki Masui

    The 36th International Japan-Korea Seminar on Ceramics (JK-Ceramics 36)  (Tottori)  2019.11  -  2019.11 

  • Novel Inorganic Orange Pigments Based on BiFeWO6

    Akari Takemura, Yusuke Shobu, Ryohei Oka, Toshiyuki Masui

    The 36th International Japan-Korea Seminar on Ceramics (JK-Ceramics 36)  (Tottori)  2019.11  -  2019.11 

  • Novel Inorganic Black Pigments Based on Ca2MnO4 for High Near-Infrared Reflectance

    Ryohei Oka, Senri Iwasaki, Toshiyuki Masui

    The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13)  (Okinawa)  2019.10  -  2019.11 

  • Synthesis and Color Evaluation of Ta5+-doped Bi2O3

    Yusuke Shobu, Ryohei Oka, Toshiyuki Masui

    The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13)  (Okinawa)  2019.10  -  2019.11 

  • Novel Inorganic Orange Pigments Based on BiFeWO6

    Akari Takemura, Yusuke Shobu, Ryohei Oka, Toshiyuki Masui

    The 13th Pacific Rim Conference of Ceramic Societies (PACRIM13)  (Okinawa)  2019.10  -  2019.11 

display all >>