研究者業績

星野 勝義

ホシノ カツヨシ  (Katsuyoshi Hoshino)

基本情報

所属
千葉大学 共用機器センター 教授 (特任教授・工学部名誉教授)
学位
工学博士
理学修士

J-GLOBAL ID
200901037550194006
researchmap会員ID
1000010535

外部リンク

経歴

 26

論文

 128
  • Satoru Tsukada, Ryota Saito, Katsuyoshi Hoshino
    ACS Applied Optical Materials 1(11) 1847-1855 2023年11月10日  査読有り最終著者
  • Yudai Teramoto, Keita Ando, Satoru Tsukada, Katsuyoshi Hoshino
    Applied Sciences 13(3) 1468-1468 2023年1月22日  査読有り最終著者責任著者
    It is empirically known that titanium dioxide nanoparticles stabilize the contact and frictional charge of the host polymers to which they are added. However, the mechanism for the stabilization process has not yet been elucidated. In this study, polyester films doped with titanium dioxide nanoparticles of different crystalline forms were triboelectrically charged and the effect of humidity on their charging characteristics was subsequently investigated to elucidate the charge stabilization mechanism. Our first finding was that the rutile-, rutile–anatase mixed crystal (P25)-, and amorphous-dominant-type titanium dioxide nanoparticles reduced the sensitivity of the films to humidity (humidity dependence), while the anatase-type titanium dioxide enhanced the humidity dependence. This difference in action was explained by associating it with the different water adsorption forms on the major crystalline surface of each titanium dioxide type. The second finding was that doping with titanium dioxide nanoparticles, particularly rutile and P25 nanoparticles, reduced fluctuations in the amount of tribocharges of the polyester film. This crystalline-form-dependent difference in action was considered to be based on the depth of the electron traps involved in each titanium dioxide type. The above two findings have allowed us to propose the first mechanism of tribocharge stabilization by titanium dioxide.
  • 寺元雄大, 宮﨑直大, 安藤啓太, 塚田 学, 星野勝義
    日本画像学会誌 61 466-478 2022年10月  査読有り責任著者
  • D. Muramatsu, A. Magori, S. Tsukada, K. Hoshino
    Electrochemistry Communications 141 107346 2022年8月  査読有り責任著者
  • Satoya Sugiura, Terumasa Mitogawa, Kota Saito, Rihito Tamura, Satoru Tsukada, Takahiko Horiuchi, Katsuyoshi Hoshino
    RSC Advances 12(31) 19965-19973 2022年7月  査読有り最終著者責任著者
    The achievement of molecular orientation control by rubbing and pressing poly(3-alkylthiophene)s is a powerful technique to improve the performance of organic electronic devices. We report here that the rubbing and pressing of blackish-brown 3-methoxythiophene oligomer powders yield layer and tablet samples with gold tones, respectively. Specular reflectivity, colorimetric, and X-ray diffraction measurements reveal that this gold tone is caused by an increase in the ratio of edge-on lamellar crystallites to face-on ones, which is promoted by rubbing/pressing. In contrast to the 3-alkylthiophene polymer, which develops a dominant face-on lamellar structure, rubbing of the 3-methoxythiophene oligomer increases the relative amount of edge-on lamellar crystallites to face-on lamellar ones. Furthermore, gold tone development in the tablet samples is limited to the near-surface area, despite the fact that pressure is also applied to the tablet bulk. These specific chemical events are explained by considering the repulsive interactions between the 3-methoxythiophene backbone and the functional groups on the surface of the substrate employed during the rubbing/pressing processes. Despite the lower applied pressure, gold tone development by rubbing is accompanied by a higher reflective property than by pressing because of the formation of larger relative amounts and sizes of edge-on lamellar crystallites, which are responsible for the gold tone.

MISC

 29

書籍等出版物

 13

講演・口頭発表等

 105

担当経験のある科目(授業)

 25

所属学協会

 2

共同研究・競争的資金等の研究課題

 62

社会貢献活動

 44

メディア報道

 43