微粒
缩进
毛细管作用
基质(水族馆)
材料科学
软质材料
纳米技术
复合材料
化学工程
地质学
工程类
海洋学
作者
Justin D. Glover,Jonathan T. Pham
出处
期刊:Soft Matter
[The Royal Society of Chemistry]
日期:2020-01-01
卷期号:16 (25): 5812-5818
被引量:8
摘要
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.
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