Correlated Li-ion migration in the superionic conductor LiGePS

Yajima, Takeshi*; Hinuma, Yoyo*; Hori, Satoshi*; Iwasaki, Rui*; Kanno, Ryoji*; Ohara, Takashi; Nakao, Akiko*; Munakata, Koji*; Hiroi, Zenji*

Journal of Materials Chemistry A, 9(18), p.11278 - 11284, 2021/05

https://doi.org/10.1039/D1TA00552A

Poly(ether ether ketone) (PEEK)-based graft-type polymer electrolyte membranes having high crystallinity for high conducting and mechanical properties under various humidified conditions

Hamada, Takashi; Hasegawa, Shin; Fukasawa, Hideyuki*; Sawada, Shinichi; Koshikawa, Hiroshi; Miyashita, Atsumi; Maekawa, Yasunari

Journal of Materials Chemistry A, 3(42), p.20983 - 20991, 2015/11

https://doi.org/10.1039/C5TA05567A

no abstracts in English

Spin orientation transition across the single-layer graphene/nickel thin film interface

Matsumoto, Yoshihiro; Entani, Shiro; Koide, Akihiro*; Otomo, Manabu; Avramov, P.; Naramoto, Hiroshi*; Amemiya, Kenta*; Fujikawa, Takashi*; Sakai, Seiji

Journal of Materials Chemistry C, 1(35), p.5533 - 5537, 2013/09

https://doi.org/10.1039/C3TC30872C

Degradation manner of polymer grafts chemically attached on thermally stable polymer films; Swelling-induced detachment of hydrophilic grafts from hydrophobic polymer substrates in aqueous media

Enomoto, Kazuyuki*; Takahashi, Shuichi*; Iwase, Takanori*; Yamashita, Takashi*; Maekawa, Yasunari

Journal of Materials Chemistry, 21(25), p.9343 - 9349, 2011/07

https://doi.org/10.1039/c0jm04084c

The degradation manner of graft-type polymer electrolyte membranes consisting of hydrophilic poly(styrenesulfonic acid) (PSSA) graft polymers (grafts) and thermally and mechanically stable hydrophobic polymer substrates was examined in hot water. Severe weight loss was observed in PSSA-grafted cPTFE and ETFE films but not in a PSSA-grafted PEEK film. The decomposed extracts in water were characterized as PSSA during the whole course of degradation, clearly showing that the PSSA grafts detached from the fluorinated substrates without decomposition or scission of graft polymer chains. This is quite a new degradation manner for graft-type polymer electrolyte membranes; namely, hydrophilic PSSA grafts detach from hydrophobic polymer substrates due to swelling-induced stress at the interfacial boundary in the grafted films.

On the role of polymer chains in transducing external mechanical forces to benzocyclobutene mechanophores

Dopieralski, P.*; Anjukandi, P.*; Rckert, M.*; Shiga, Motoyuki; Ribas-Arino, J.*; Marx, D.*

Journal of Materials Chemistry, 21(23), p.8309 - 8316, 2011/06

https://doi.org/10.1039/c0jm03698f

The role played by polyethylene-like oligomers in transducing external tensile forces to benzo-cyclobutene mechanophores is investigated computationally. It is demonstrated that the oligomerchains do indeed exert a notable influence on the force-dependence of the activation energies of bothconrotatory and disrotatory ring-opening processes of a 1,2-disubstituted benzocyclobutene. This opens the doorway to tuning the properties of mechanoresponsive materials not only bychanging the properties of the mechanophore itself, but also by tailoring the force-transducing chain molecules attached to it. Furthermore, it is found that these chains even have a profound impact on the topology of the force-transformed potential energy surface in the vicinity of conrotatory transition states. Hitherto unexpected and most striking is the phenomenon that some of these conrotatory transition states are found to drive the system to disrotatory products.

Tuning hydrogen production during oxide irradiation through surface grafting

Alam, M.*; Miserque, F.*; Taguchi, Mitsumasa; Boulanger, L.*; Renault, J. P.*

Journal of Materials Chemistry, 19(24), p.4261 - 4267, 2009/06

https://doi.org/10.1039/b901936g

The production of molecular hydrogen in the radiolysis with TiO grafted silica has been carefully studied using 10 MeV electrons. In all cases, H yield increases linearly with absorbed dose. Under the irradiation it was observed that with the increasing number of titanium dioxide deposition cycle a decrease in dihydrogen production were observed. A faster decrease in dihydrogen production was observed with a very small amount of titanium dioxide deposition i.e with an average thickness of 0.1 nm as measured by XPS. The productions of H were found to be decreased almost by 50 % with a TiO thickness at around 1 nm.

Selenium oxyanions; Highly selective uptake by a novel anion exchanger

Kozai, Naofumi; Onuki, Toshihiko; Komarneni, S.*

Journal of Materials Chemistry, 17(12), p.2993 - 2996, 2002/12

Here we report the extremely high and selective uptake of selenium oxyanions by a novel exchanger, NiZn(OH)(OCOCH)・nHO that has brucite-type hydroxide layers with OCOCH anions in the interlayers. This Ni-Zn basic salt exhibited very high selectivity for Se(IV) (Kd = 9.0x10 ml/g with an initial Se(IV) concentration of 1x10 M) in the presence of 0.1M Cl solution while the well known anionic clay, MgAl(OH)NO・nHO showed a Kd of 6.0x10 ml/g under the same conditions. The uptake of Se(IV) on the Ni-Zn basic salt was found to be irreversible when treated with solutions containing 1N Cl, 1N NO, or 1N PO, while the Se(IV) sorbed on anionic clay was easily desorbed in a 1M Cl solution. This novel exchanger also showed high Kd (2.610 ml/g at an initial Se concentration of 110 M) for Se(VI) and therefore it is expected to be useful for decontamination and removal of selenium oxyanions from contaminated water.