Dynamics of wetting: Effects of surface roughness
摘要：
The rates of "dry" (nonvolatile) spreading on smooth and on rough surfaces are compared. For smooth surfaces, the experimental results appear to be well described by two simple, theoretically predicted, power laws, one for the initial, "capillarity" regime, well observable for small drops, and one for more spread-out drops, dominated by gravity effects. The transition, however, is not located at a well-defined value of the radius R of the wetted spot but involves time and the chemical nature of the solid surface. Rough surfaces give rise to a new and interesting regime of fast spreading along troughs offered by the surface roughness. The data seem consistent with another power law R tr, where r ranges between 0.25 and 0.40. A tentative explanation is forwarded in terms of spreading under an essentially constant capillary force.
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DOI：
10.1021/j100280a075
被引量：
年份：
1986
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