Particle-surface capillary forces with disjoining pressure

被引：9

作者：

Lubarsky, Gennady V. ^{[1
]}

Davidson, Marcus R. ^{[1
]}

Bradley, Robert H. ^{[1
]}

机构：

[1] Robert Gordon Univ, Sch Engn, Adv Mat & Biomat Res Ctr, Aberdeen AB10 1FR, Scotland

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2006年 / 8卷 / 21期

关键词：

D O I：

10.1039/b602005d

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：

A new, atomic force microscopy (AFM) based experimental setup for the continuous acquisition of friction force data as a function of humidity has been developed. The current model of interactions between wet contacts under the influence of capillary effects, has been amended to include a vertical component due to the disjoining pressure and takes into account the influence of liquid films adsorbed on the surface. This is a 'switching' model, i.e. the contact between nanometer-sized sphere and a. at surface can exist in two distinct states due to capillary bridge formation/destruction as the humidity is varied. The model has been qualitatively verified on samples of differing wettability produced by UV-ozone treatment of polystyrene ( PS). Results of AFM analysis of the friction vs. vapor pressure curves collected from the surface are presented. Correlation between important surface properties such as wettability, adsorption, and contact angle and friction force under varying humidity were found and discussed.

引用

页码：2525 / 2530

页数：6

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