Drop impact on super-wettability-contrast annular patterns
- Drop impact on super-wettability-contrast annular patterns
- 김승호; 문명운; 김호영
- super wettability; annular pattern; nanostructure; drop impact; capillary flows; drops and bubbles; interfacial flows (free surface)
- Issue Date
- Journal of fluid mechanics
- VOL 730, 328-342
- 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.
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