研究者業績

塚田 学

ツカダ サトル  (Tsukada Satoru)

基本情報

所属
千葉大学 大学院工学研究院 助教
学位
博士(理学)(東京大学)

ORCID ID
 https://orcid.org/0000-0003-0175-6152
J-GLOBAL ID
201801009290235338
Researcher ID
R-5004-2018
researchmap会員ID
B000299695

外部リンク

受賞

 15

論文

 59
  • Satoru Tsukada, Ryota Saito, Katsuyoshi Hoshino
    ACS Applied Optical Materials 1(11) 1847-1855 2023年11月10日  査読有り筆頭著者責任著者
  • Yudai Teramoto, Keita Ando, Satoru Tsukada, Katsuyoshi Hoshino
    Applied Sciences 13(3) 1468-1468 2023年1月22日  査読有り
    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.
  • Daisuke Muramatsu, Keisuke Masunaga, Aoi Magori, Satoru Tsukada, Katsuyoshi Hoshino
    ACS Omega 7(23) 19216-19224 2022年6月14日  査読有り
  • Satoya Sugiura, Terumasa Mitogawa, Kota Saito, Rihito Tamura, Satoru Tsukada, Takahiko Horiuchi, Katsuyoshi Hoshino
    RSC Advances 12(31) 19965-19973 2022年  査読有り
    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.
  • Muramatsu, D., Magori, A., Tsukada, S., Hoshino, K.
    Electrochemistry Communications 141 2022年  査読有り

MISC

 5

書籍等出版物

 3

共同研究・競争的資金等の研究課題

 4