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Drop impact on super-wettability-contrast annular patterns

Published online by Cambridge University Press:  30 July 2013

Seungho Kim ,
Myoung-Woon Moon  and
Ho-Young Kim
Seungho Kim
Affiliation:
School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-744, Korea
Myoung-Woon Moon
Affiliation:
Institute of Multidisciplinary Convergence of Materials, Korea Institute of Science and Technology, Seoul 136-791, Korea
Ho-Young Kim*
Affiliation:
School of Mechanical and Aerospace Engineering, Seoul National University, Seoul 151-744, Korea
*
†Email address for correspondence: hyk@snu.ac.kr
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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.

JFM classification

Interfacial Flows (free surface): Capillary flows Drops and Bubbles: Drops and Bubbles Interfacial Flows (free surface): Interfacial Flows (free surface)
Type
Papers
Information
Journal of Fluid Mechanics , Volume 730 , 10 September 2013 , pp. 328 - 342
Copyright
©2013 Cambridge University Press 

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