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Adsorption layer and flow within liquid meniscus in forced dewetting
Current Opinion in Colloid & Interface Science ( IF 8.9 ) Pub Date : 2023-07-04 , DOI: 10.1016/j.cocis.2023.101723
V.I. Kovalchuk , G.K. Auernhammer

In surfactant solutions, the bulk hydrodynamic flow couples to extensional/compressional surface flows due to Marangoni stresses induced at the interface. With the increasing surfactant concentration, these Marangoni stresses can suppress the surface flows and lead to non-moving, retarded, surfaces. We review this phenomenon with special focus on the dynamic dewetting of a substrate pulled out of a pool of surfactant solution. In this case, the dewetting meniscus surface can be retarded (fully or partially) because of the appearance of surface tension gradients opposing the flow in the adjacent liquid. With an increasing flow velocity, the non-uniformity of the meniscus surface becomes stronger resulting in its separation on a mobile and an immobile part with a sharp transition between them. The presence of a non-uniform adsorption layer at the meniscus surface strongly complicates the dewetting dynamics which becomes dependent on the surfactant balance at the surface.



中文翻译:

强制去湿时液体弯月面内的吸附层和流动

在表面活性剂溶液中,由于界面处产生的马兰戈尼应力,整体流体动力流与拉伸/压缩表面流耦合。随着表面活性剂浓度的增加,这些马兰戈尼应力会抑制表面流动并导致不移动、延迟的表面。我们回顾了这种现象,特别关注从表面活性剂溶液池中拉出的基材的动态去湿。在这种情况下,由于与相邻液体中的流动相反的表面张力梯度的出现,弯液面的去湿可以被延迟(完全或部分)。随着流速的增加,弯液面的不均匀性变得更强,导致其在移动部分和固定部分上分离,并且它们之间有急剧的过渡。

更新日期:2023-07-04
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