Stability of voids formed in cavities at liquid-solid interfaces

被引:1
作者
Bullard, JW [1 ]
机构
[1] Natl Inst Stand & Technol, Mat Construct Res Div, Gaithersburg, MD 20899 USA
关键词
interfaces; wetting; thermodynamic modeling; air voids;
D O I
10.1016/j.jcis.2004.03.054
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 thermodynamic model is developed of the free energy of gas-filled voids formed within cavities on solid surfaces covered by a liquid. Capillary effects are assumed to be the only important contributions to the free energy, and expressions are derived for the free energy of the system as a function of the void size, the relative surface free energy densities involved, and the geometry of the cavity. The results of the model are (1) construction of a stability diagram that maps the most stable void configuration versus the wetting properties of the various solid surfaces involved, and (2) rough estimates of the work required to liberate a void of a given size and position. The model can give qualitative insight into the stability of coating defects on uneven surfaces, and also can be used to prescribe possible surface treatments for reducing the work required to remove voids from the system. (C) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码:188 / 196
页数:9
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