论文标题
毛细管驱动的微粒缩进到软涂层的基材中
Capillary-driven indentation of a microparticle into a soft, oil-coated substrate
论文作者
论文摘要
在许多情况下，从关节软骨上的滑液到潮湿环境中的粘合剂，柔软的液体涂层层和僵硬的表面之间的小尺度接触是常见的。此外，许多关于软粘合剂触点的模型研究是用软硅弹性体进行的，这些弹性弹性体具有无连接的液体分子（即硅油），当模量较低时。我们研究了软底物上硅油层的厚度如何与与交联PDM接触的玻璃微球的压痕深度，该玻璃微球的模量小于10 kPa。颗粒缩入基础的颗粒是减小油层厚度的函数。这是由于表面上存在液体层，导致毛细力向下推在粒子上。提出了一个简单的模型，该模型与底物的弹性和表面张力力平衡，并提出了颗粒 - 覆盖力，以预测粒子压痕深度。
Small scale contact between a soft, liquid-coated layer and a stiff surface is common in many situations, from synovial fluid on articular cartilage to adhesives in humid environments. Moreover, many model studies on soft adhesive contacts are conducted with soft silicone elastomers, which possess uncrosslinked liquid molecules (i.e. silicone oil) when the modulus is low. We investigate how the thickness of a silicone oil layer on a soft substrate relates to the indentation depth of glass microspheres in contact with crosslinked PDMS, which have a modulus of <10 kPa. The particles indent into the underlying substrate more as a function of decreasing oil layer thickness. This is due to the presence of the liquid layer at the surface that causes capillary forces to push down on the particle. A simple model that balances the capillary force of the oil layer and the particle-substrate adhesion with the elastic and surface tension forces from the substrate is proposed to predict the particle indentation depth.
