【10th Dec】Using Contact Line – Dependent Wetting
日期:2013-12-10 阅读:914

题目:Using Contact Line – Dependent Wetting
报告人:Prof. Thomas J. McCarthy, Polymer Science and Engineering Department, University of Massachusetts
时  间:12月10日 (周二), 下午2:00
地  点:化学A楼5楼演讲厅
邀请人:朱新远 教授 ,黄卫 研究员



    After a review of portions of our 2006-2009 work on wetting and superhydrophobicity, the use of several of the concepts of this work will be described. Several series of experiments involving contact line pinning will be discussed that were designed using the contact line perspective of wetting and require this perspective to explain the observed results. Perspectives based on contact areas, for example, Wenzel’s and Cassie’s, are not useful in these experimental situations. Descriptions of using thin hydrophilic contact lines to support films of water (puddles and kinetically trapped thin films) on waterrepellent surfaces and to control the shape (both 2D and 3D) of these thin films and puddles will be presented. Dip-Coating deposition on both chemically and topographically patterned surfaces will be discussed. Water capillary bridges that span hydrophilic pinning features on parallel and hydrophobic surfaces are distorted by shearing the parallel plates at a low rate. The capillary bridges lengthen and distort to balance Laplace pressure (equilibrate mean curvature) as the features are separated and eventually rupture at a distance that is a function of the liquid volume, the advancing and receding contact angles of the surfaces, the separation between the parallel surfaces, and in particular, the shape and orientation of the hydrophilic pinning features. Sessile capillary bridge failure will be introduced and distinguished from tensile capillary bridge failure.

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