The effect of surface ions on water adsorption to mica

被引：78

作者：

Balmer, T. E. ^{[2
]}

Christenson, H. K. ^{[3
]}

Spencer, N. D. ^{[2
]}

Heuberger, M. ^{[1
]}

机构：

[1] EMPA, CH-9014 St Gallen, Switzerland

[2] ETH, Dept Mat, CH-8093 Zurich, Switzerland

[3] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England

来源：

LANGMUIR | 2008年 / 24卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1021/la702391m

中图分类号：

O6 [化学];

学科分类号：

0703 [化学];

摘要：

We have measured the adsorption isotherms of water on a single surface of freshly cleaved mica with K+ on the surface, and on mica where the K+ has been exchanged for H+. Using a very sensitive interferometric technique, we have found a significant difference between the two isotherms at submonolayer coverage, for relative vapor pressures p/p(0) < 0.5. The K+-mica isotherm shows a pronounced convexity, suggesting distinct adsorption sites, whereas the H+-mica isotherm is flatter. The two isotherms converge above monolayer coverage. The results give a graphic demonstration of the importance of nanoseale surface heterogeneities for vapor adsorption at submonolayer coverage.

引用

页码：1566 / 1569

页数：4

共 29 条

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The behaviour of liquid drops and adsorbed films at cleavage surfaces of mica. [J].