X-ray absorption fine structure of ions attracted by a zwitterionic surface monolayer
X-ray absorption fine structure of ions attracted by a zwitterionic surface monolayer
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两性离子表面单层吸引离子的 X 射线吸收精细结构
DOI：
10.1021/jp026248n
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发表时间：
2003
影响因子：
3.3
通讯作者：
I. Watanabe
中科院分区：
文献类型：
--
作者：
M. Harada;T. Okada;I. Watanabe
采用全反射全转换氦离子产额x射线吸收精细结构（TRTCY-XAFS）研究了Zn2+和Br-在两性离子表面单层上的吸附等温线及其局部结构。该表面单分子层是通过从本体溶液中自发吸附n -十二烷基- n， n -二甲氨基丁烷磺酸（DDABS）在水溶液表面制备的。Zn2+在表面单分子层上的吸附取决于阴离子共存的性质；低水合的大阴离子如ClO4-被很好地分配到DDABS单层中，Zn2+被产生的负电位吸引。TRTCY-XAFS光谱表明，被表面单层吸引的Zn2+大部分是水合的，但在DDABS中有部分是被磺酸结合的，特别是当阴离子分配引起大的负电位时。Br-的TRTCY-XAFS光谱也表明在表面单层中存在水合Br-和与铵基结合的Br-。采用FEFF计算，…
The adsorption isotherms of Zn2+ and Br- on a zwitterionic surface monolayer and their local structures have been studied by total-reflection total-conversion helium ion yield X-ray absorption fine structure (TRTCY-XAFS). The surface monolayer is prepared by spontaneous adsorption of N-dodecyl-N,N-dimethylammonio-butane sulfonic acid (DDABS) on an aqueous solution surface from a bulk solution. The adsorption of Zn2+ on the surface monolayer depends on the nature of coexistent anions; a poorly hydrated large anion such as ClO4- are well partitioned into the DDABS monolayer, and Zn2+ is attracted by generated negative potential. TRTCY-XAFS spectra indicate that Zn2+ attracted by the surface monolayer is mostly hydrated, but is partly bound by the sulfonic acid in DDABS, particularly when the large negative potential is induced by anion-partition. The TRTCY-XAFS spectra of Br- also imply the coexistence of hydrated Br- and that bound by the ammonium group in the surface monolayer. The calculation using FEFF,...