Competitive displacement of thin liquid films on chemically patterned substrates
Competitive displacement of thin liquid films on chemically patterned substrates
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化学图案基底上薄液膜的竞争位移
DOI：
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发表时间：
2005
影响因子：
3.7
通讯作者：
Satish Kumar
中科院分区：
文献类型：
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作者：
Richard D. Lenz;Satish Kumar
这项工作研究了由平行固体表面界定并受到驱动去湿的范德华力作用的分层液体薄膜之间的界面行为。首先考虑化学均质表面；接下来是对化学异质表面的研究。应用润滑近似来获得描述界面行为的单个非线性演化方程，并检查界面的线性稳定性和非线性发展。对于均匀情况，详细描述了界面破裂时间对问题参数（例如粘度比、初始界面高度、界面张力和范德华力大小）的敏感性。这是研究非均质情况的基础，其中破裂时间对非均质长度尺度的强烈依赖性被发现相对独立于其余问题参数的变化。还详细探讨了断裂时间行为的机制。结果表明一种液体可以乳化在另一种液体中，并且可能有利于基于润湿性现象的工业过程，例如平版印刷。
The behaviour of the interface between stratified thin liquid films bounded by parallel solid surfaces and subject to van der Waals forces which drive dewetting is studied in this work. Chemically homogeneous surfaces are considered first; this is followed by an investigation of chemically heterogeneous surfaces. The lubrication approximation is applied to obtain a single nonlinear evolution equation which describes the interfacial behaviour, and both the linear stability and nonlinear development of the interface are examined. The sensitivity of the interfacial rupture time to problem parameters such as the viscosity ratio, initial interfacial height, interfacial tension, and magnitude of the van der Waals forces is characterized in detail for the homogeneous case. This serves as a basis for a study of the heterogeneous case, where the strong dependence of the rupture time on the length scale of the heterogeneity is found to be relatively independent of changes in the remaining problem parameters. The mechanisms underlying the rupture-time behaviour are also explored in detail. The results suggest a route by which one liquid can become emulsified in the other, and may be beneficial to industrial processes such as lithographic printing which are based on wettability phenomena.