Contact angle hysteresis and lateral adhesion strength on random rough surfaces
Qingrui Song, Kun Liu, Wei Sun, Yunlong Jiao, Zhaochang Wang, Xiaojun Liu, Jiaxin Ye
Abstract
Based on the classical Robbins–Joanny model of contact angle hysteresis, a new dimensionless parameter (q0/q2) sensitive to roughness power spectrum is proposed to be linearly related to (1) contact angle hysteresis caused by roughness heterogeneity and (2) lateral adhesion strength of a sliding water bridge. Both hypotheses were validated using liquid bridge sliding experiments on random rough surfaces. q0/q2 qualitatively reflects the decay rate of any two points on the surface from mutually independent to correlated with diminishing separation distance.
Topics & Concepts
HysteresisDimensionless quantityPhysicsContact angleSurface finishSurface roughnessMechanicsSurface (topology)AdhesionCondensed matter physicsComposite materialGeometryMaterials scienceThermodynamicsMathematicsQuantum mechanicsAdhesion, Friction, and Surface InteractionsSurface Modification and SuperhydrophobicityFluid Dynamics and Thin Films