Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Yamaguchi, Daisuke; Koizumi, Satoshi; Hasegawa, Yoshio*; Hishinuma, Yukio*; Suzuki, Masashi*; Kodama, Hiroto*; Onuma, Masato*; Oba, Yojiro*
no journal, ,
The structure of nitrogen (N)-doped titanium dioxide (TiO
), which exhibits an improved photo-catalytic property, was investigated by small-angle neutron (SANS) and X-ray scattering (SAXS) methods. The N-doped TiO nanosheet showed a SANS profile, of which q-dependence is nearly identical to that of undoped TiO nanosheet, however, of which intensity is three times as large as that of undoped TiO nanosheet. As for the SAXS measurements, hardly any difference was observed between undoped TiO nanosheet and N-doped one. For N-doped nanosheet, a core-shell structure where TiO particles locate at the center and N atoms surround the surface of TiO particles was deduced from the analysis of those obtained SANS and SAXS profiles by taking account of the difference in scattering contrast between neutron and X-ray for each component, i.e., Ti, O, and N atoms.
Noda, Yohei; Yamaguchi, Daisuke; Hashimoto, Takeji; Koizumi, Satoshi; Tominaga, Tetsuo*; Sone, Takuo*; Yuasa, Takeshi*
no journal, ,
For silica-filled styrene-butdiene rubber samples, we measured small angle neutron scattering with the proton spins in the samples being aligned to one direction. As a result, we precisely determined the silica particles' dispersion by the abstracted partial scattering function.
Koizumi, Satoshi
no journal, ,
no abstracts in English
Putra, A.; Yamaguchi, Daisuke; Koizumi, Satoshi
no journal, ,
Zhao, Y.; Koizumi, Satoshi; Rikukawa, Masahiro*; Yoshida, Miru*
no journal, ,
Maekawa, Yasunari; Sinnananchi, W.; Koshikawa, Hiroshi; Yamaki, Tetsuya; Asano, Masaharu; Yamamoto, Kazuya*; Sampei, Fumihiro*; Asazawa, Koichiro*; Yamaguchi, Susumu*; Tanaka, Hirohisa*
no journal, ,
Anion-exchange membranes (AEM) for hydrazine fuel cells, in which non precious metals are used as a electrode catalyst, were prepared using radiation techniques. The grafted AEM were prepared by the radiation-induced graft polymerization of chloromethylstyrene (CMS) into poly(ethylene-co-tetrafluoroethylene) (ETFE) films and subsequent quaternization of the grafts with trimethylamine. When the grafted AEM were treated in 1M-KOH and washed with N
-saturated water, the membranes with chloride form (ETFE-TMAMS(Cl)) can be converted quantitatively to hydroxide form (ETFE-TMAMS(OH)) without the formation of the bicarbonate form. The grafted AEM with IEC of 2.0 mmol/g showed the maximum power density of more than 300 mW/cm
with stability for 400 hours under the operation at 80
C.
Yamaki, Tetsuya; Sekine, Toshihiko; Sawada, Shinichi; Asano, Masaharu; Maekawa, Yasunari; Suzuki, Akihiro*; Terai, Takayuki*
no journal, ,
We investigated mass transport properties in polymer electrolyte membranes by an isotope tracer technique using tritiated water (HTO) and heavy-oxygen water (H
O). The materials for our diffusion analysis were a Nafion membrane and the crosslinked-fluoropolymer-based radiation-grafted membranes which we prepared by our original method. Tritium from HTO is transported not only by translational motion of water, but also by an intermolecular hydrogen-tritium exchange. The effective diffusion coefficient of HTO, D(HTO)
, in an water-methanol mixture was considered by correcting statistical distribution to hydroxyl groups of methanol at a concentration of 10 M. A ratio of D(HTO) or D(HTO) to D(HO) appeared to be different between the membranes probably reflecting the isotopic effect on the interaction with sulfonic acid groups. Consequently, our analysis would give the information about the physico-chemical state of water in the membrane.