Tunable contact angle hysteresis on micropatterned surfaces

TL;DR

This study demonstrates how micropatterned surfaces with adjustable gaps can tune contact angle hysteresis during droplet evaporation, supported by a predictive model for the observed wetting behavior.

Contribution

It introduces a novel method to tune contact angle hysteresis on micropatterned surfaces by adding gaps, and develops a model to predict this behavior.

Findings

Receding contact angle can be tuned from 34.6° to 89.1°

Contact angle hysteresis varies with gap length

Model accurately predicts wetting behavior

Abstract

Micropatterned surfaces composed of concentric circular defects having a smooth trench-like profile are formed using a photoresist (SU-8). When an evaporating droplet encounters the micropatterned surface an evaporation phase is observed consisting of distinct discontinuities and steps in the droplet wetting contact angle and base radius respectively. The addition of gaps into the circular defects enables tuning of the contact angle hysteresis; the receding contact angle of fluorocarbon coated SU-8 can be tuned between 34.6{\deg} and 89.1{\deg} and that of SU-8 surfaces from 5.6{\deg} to 43.3{\deg} depending on the gap length. In addition, a model is developed which accurately predicts the observed behavior.