Fig. 1
From: Contamination-free non-contact wettability assessment system
Surface wettability assessment based on liquid squeezing by a jet flow. Schematic illustrations a, b show the liquid squeezing on hydrophilic and hydrophobic surfaces, respectively. Photographs c, d show the behaviors of ultra-pure water squeezed by an air-jet flow on hydrophilic and hydrophobic surfaces, corresponding to the contact angles of 65.8° (e) and 85.2° (f), respectively