Contact angle hysteresis and lateral adhesion strength on random rough surfaces

摘要

Based on the classical Robbins-Joanny model of contact angle hysteresis, a new dimensionless parameter (q(0)/q(2)) 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. q(0)/q(2) qualitatively reflects the decay rate of any two points on the surface from mutually independent to correlated with diminishing separation distance. Published under an exclusive license by AIP Publishing.

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