Electron spin resonance studies on silver atoms in imogolite fibers

被引:12
作者
Yamada, H
Michalik, J
Sadlo, J
Perlinska, J
Takenouchi, S
Shimomura, S
Uchida, Y
机构
[1] Natl Inst Mat Sci, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan
[2] Inst Nucl Chem & Technol, PL-03195 Warsaw, Poland
关键词
ESR spectroscopy; imogolite; silver atoms; gamma-irradiation;
D O I
10.1016/S0169-1317(01)00056-4
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The formation and stabilization of reduced silver species in imogolite have been studied by electron spin resonance (ESR) spectroscopy. Ag-loaded imogolite samples after degassing and dehydration were gamma -irradiated at 77 K and monitored by ESR as the temperature increased. Some samples were exposed to methanol vapour after dehydration. It was found that imogolite shows exceptional ability to stabilize silver atoms. In dehydrated Ag-imogolite silver atoms generated at low temperature remain stable at room temperature. Silver atoms are also formed in imogolite samples exposed to methanol. However, in contrast to silver agglomeration in molecular sieves and smectites exposed to methanol there is no indication of the formation of cationic silver clusters in Ag-imogolite. It is postulated that there are special trapping sites in imogolite structure which effectively stabilize silver atoms. (C) 2001 Published by Elsevier Science B.V.
引用
收藏
页码:173 / 178
页数:6
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