title: Contact angle hysteresis on randomly rough surfaces: a computational study.
abstract: Wetting is important in many applications, and the solid surfaces being wet invariably feature some amount of surface roughness. A free energy-based computational simulation is used to study the effect of roughness on wetting and especially contact angle hysteresis. On randomly rough, self-affine surfaces, it is found that hysteresis depends primarily on the value of the Wenzel roughness parameter r, increasing in proportion with r - 1. Micrometer-level roughness causes hysteresis of a few degrees.
authors.affiliation: Department of Mechanical & Industrial Engineering, Room RM502A, University of Toronto, 5 King's College Rd., Toronto, ON, Canada M5S 3G8.
authors.forename: Robert
authors.initials: R
authors.lastname: David
authors.forename: A Wilhelm
authors.initials: AW
authors.lastname: Neumann