Adhesion-induced instability patterns in thin confined elastic film
Adhesion-induced instability patterns in thin confined elastic film
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DOI：
10.1021/la026932t
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发表时间：
2003-04-01
期刊：
影响因子：
3.9
通讯作者：
Chaudhury, MK
中科院分区：
文献类型：
--
作者：
Ghatak, A;Chaudhury, MK
在柔性板和弹性薄膜的界面处观察到了粘附引起的不稳定性。限制膜的表面几乎瞬间产生波动，并且不稳定图案以指状物或气泡的形式出现在界面处。这些不稳定性的特征波长保持独立的所有材料和几何性质的系统，除了膜的厚度。这些观察结果与Saffman-Taylortype现象形成鲜明对比，其中不稳定图案的长度尺度除了取决于液膜的厚度之外还取决于粘性和表面张力。这里报道的现象和瑞利-开尔文不稳定性与弯曲的液体晶体之间的类比更加明显，因为在这两种情况下，表面力触发不稳定性，而不是决定其波长。这种不稳定性也揭示了在受限的粘结层中的空穴现象。
Adhesion-induced instability has been observed at the interface of a flexible plate and a thin elastic film bonded to a rigid substrate. The surface of the confined film develops undulations almost instantaneously, and instability patterns appear in the form of fingers or bubbles at the interface. The characteristic wavelengths of these instabilities remain independent of all material and geometrical properties of the system except the thickness of the film. These observations contrast sharply with the Saffman-Taylortype phenomenon in which the length scale of the instability patterns depends on the viscous and surface tension forces in addition to the thickness of the liquid film. The analogy between the phenomenon reported here and the Rayleigh-Kelvin instability with curved liquid menisci is more pronounced, as, in both cases, surface force triggers the instability while not determining its wavelength. The instability also throws light on cavitation phenomena in confined adhesive layers.