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Kim Seok-Jun Sakai Takaaki Oda Hiroyuki Okuyama Yuji Mizutani Yumi Hamagami Jun-Ichi Matsuka Maki Ishihara Tatsumi Matsumoto Hiroshige 《Journal of Solid State Electrochemistry》2012,16(11):3587-3592
Journal of Solid State Electrochemistry - The long-term stability in water was investigated for an inorganic proton conductor based on sulfated hydrous titania electrolyte in water electrolysis.... 相似文献
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Takaaki Sakai Seok-Jun Kim Satoshi Kajitani Jun-ichi Hamagami Hiroyuki Oda Maki Matsuka Tatsumi Ishihara Hiroshige Matsumoto 《Journal of Solid State Electrochemistry》2012,16(6):2055-2059
The proton conduction properties of sulfuric acid-modified nano-titania prepared by impregnation method were investigated. The proton conductivity of sulfuric acid-modified nano-titania was almost the same as that of hydrous sulfated nano-titania investigated in our previous work when the amount of adsorbed sulfate groups was almost the same. The highest conductivity was obtained at an adsorbed sulfate group amount of 0.42?mmol/g, not 0.97?mmol/g. This result indicates that the enhancement of conductivity with increasing amount of adsorbed sulfate groups is limited. This might be attributable to insufficient water molecule adsorption on the Ti4+ site coordinated with a bidentate sulfate group due to the prevention by excess sulfuric acid. 相似文献
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6‐Azido‐6‐deoxy‐l‐idose as a Hetero‐Bifunctional Spacer for the Synthesis of Azido‐Containing Chemical Probes
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Hiroki Hamagami Dr. Motofumi Kumazoe Dr. Yoshiki Yamaguchi Dr. Shinichiro Fuse Prof. Dr. Hirofumi Tachibana Dr. Hiroshi Tanaka 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(36):12884-12890
The design of 6‐azido‐6‐deoxy‐l ‐idose for use as a hetero‐bifunctional spacer is reported. The hemiacetal at one terminus is an equivalent of an aldehyde and can react with nucleophiles, such as amino groups and electron‐rich aromatics. The azido group at the other terminus bio‐orthogonally undergoes a Hüisgen [3+2] cycloaddition with an acetylene. The idose derivative exhibited a higher level of reactivity towards oxime formation than a corresponding glucose derivative. The 13C NMR spectrum of the uniformly 13C‐labeled 6‐azido‐idose indicated that the acyclic forms of the sugar totaled 0.3 % of all the isomers, whereas those of glucose totaled 0.01 %. The larger population of the acyclic forms of the idose derivative would result in higher reactivity towards electrophilic addition in comparison with glucose derivatives. Finally, we prepared a C‐idosyl epigallocatechin gallate (EGCG) that bears an azido group through C‐glycosylation of EGCG with 6‐azido‐idose. This glycosyl form of the C‐idosyl EGCG exhibited a cytotoxicity against U266 cells that was comparable to that of EGCG. These results suggested that the EGCG derivative could be used as an effective chemical probe for the elucidation of EGCG biological functions. 相似文献
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Jun-Ichi Hamagami Gou Yamaguchi Kiyoshi Kanamura Takao Umegaki 《Phosphorus, sulfur, and silicon and the related elements》2013,188(8-9):1921-1922
An in situ atomic force microscope (AFM) combined with surface potential measurement was used to observe the apatite formation on the 45S5 Bioglass-type glass in simulated body fluid (SBF). From the observation, it can be seen that small islands with 5-10 nm size are formed on the glass surface in the initial soaking period within 1 h. 相似文献
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