Article ID Journal Published Year Pages File Type
594824 Colloids and Surfaces A: Physicochemical and Engineering Aspects 2011 6 Pages PDF
Abstract

Evaporation of water droplets deposited on metal and polymer substrates was studied. The evaporated droplet demonstrates different behavior on weakly pinning (polymer) and strongly pinning (metallic) surfaces. When deposited on polymer surfaces, the evaporated droplet is featured by stick-slip sliding, whereas on strong-pinning metallic surfaces it does not show such kind of motion and demonstrates the giant contact-angle hysteresis. Stick-slip motion of droplets is described satisfactorily by the Shanahan–Sefiane model relating this kind of motion to surmounting potential barriers caused by the pinning of the triple (three-phase) line. The experimentally established “stick” times coincide with the values predicted by the Shanahan–Sefiane theory. The values of potential barriers are reported. The notion of the equilibrium contact angle is refined.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Evaporation of water droplets deposited on strongly and weakly pinning substrates was studied. ► The evaporated droplet demonstrates stick-slip sliding, on weakly pinning (polymer) surfaces. ► The stick-slip motion of a droplet results from surmounting potential barriers due to the pinning of the triple line. ► The values of potential barriers are reported. ► Strongly pinning surfaces are characterized by the giant hysteresis of the contact angle.

Related Topics
Physical Sciences and Engineering Chemical Engineering Colloid and Surface Chemistry
Authors
, , ,