Drop impact on super-wettability-contrast annular patterns

Title
Drop impact on super-wettability-contrast annular patterns
Authors
김승호문명운김호영
Keywords
super wettability; annular pattern; nanostructure; drop impact; capillary flows; drops and bubbles; interfacial flows (free surface)
Issue Date
2013-09
Publisher
Journal of fluid mechanics
Citation
VOL 730, 328-342
Abstract
Extreme wetting properties of solids, either superhydrophobic or superhydrophilic, provide versatile methods to achieve unusual liquid deposit morphologies, such as liquid pearls or polygonal films. Here we report the dynamics of liquid drops that impact on solid surfaces where the extreme wetting properties are coupled in such a way that a superhydrophilic annulus is patterned on a superhydrophobic background. The drop that initially spreads on the inner superhydrophobic region is arrested by the hydrophilic annulus. The liquid deposit gets destabilized because of the strong water repellence of the inner region, exhibiting the burst and disengagement of the liquid film. This process leads to the formation of a liquid ring defined by the annulus pattern, which has practical implications in rapid printing of functional liquids. We visualize such drop dynamics with a high-speed camera and characterize their salient features by combining experimental measurements and theoretical considerations.
URI
http://pubs.kist.re.kr/handle/201004/45947
ISSN
00221120
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KIST Publication > Article
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