润湿
分子间力
无量纲量
粘附
云母
基质(水族馆)
化学物理
表面力仪
材料科学
接触角
表面力
固体表面
分子
纳米技术
化学
热力学
复合材料
机械
地质学
物理
海洋学
有机化学
作者
Rong An,Liangliang Huang,Yun Long,Berç Kalanyan,Xiaohua Lü,Keith E. Gubbins
出处
期刊:Langmuir
[American Chemical Society]
日期:2015-12-30
卷期号:32 (3): 743-750
被引量:40
标识
DOI:10.1021/acs.langmuir.5b04115
摘要
Using atomic force microscopy, the nanofriction coefficient was measured systematically for a series of liquids on planar graphite, silica and mica surfaces. This allows us to explore the quantitative interplay between nanofriction at liquid–solid interfaces and interfacial wetting. A corresponding states theory analysis shows that the nanofriction coefficient, μ = dFF/dFN, where FF is the friction force and FN is the normal force, is a function of three dimensionless parameters that reflect the intermolecular forces involved and the structure of the solid substrate. Of these, we show that one parameter in particular, β = ρsΔsσls2, where ρs is the atomic density of the solid, Δs is the spacing between layers of solid atoms, and σls is the molecular diameter that characterizes the liquid–substrate interaction, is very important in determining the friction coefficient. This parameter β, which we term the structure adhesion parameter, provides a measure of the intermolecular interaction between a liquid molecule and the substrate and also of the surface area of contact of the liquid molecule with the substrate. We find a linear dependence of μ on the structure adhesion parameter for the systems studied. We also find that increasing β leads to an increase in the vertical adhesion forces FA (the attractive force exerted by the solid surface on the liquid film). Our quantitative relationship between the nanofriction coefficient and the key parameter β which governs the vertical adhesive strength, opens up an opportunity for describing liquid flows on solid surfaces at the molecular level, with implications for the development of membrane and nanofluidic devices.
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