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Issue 18, 2011
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Substrate dependent drop deformation and wetting under high frequency vibration

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Abstract

We explore the peculiar steady component of a sessile drop response to MHz order vibration, found to be dependent on its initial wettability. Placed on a vibrating hydrophobic substrate, the drop elongates vertically in the direction of the incident sound wave while remaining hydrophobic. In contrast, the drop is seen to spread on a slightly hydrophilic substrate. We elucidate this discrepancy by revealing the competing effects between the radiation pressure exerted at the bulk air/water interface and the acoustic streaming force on the contact line, revealing the critical role of the flow in the viscous boundary layer.

Graphical abstract: Substrate dependent drop deformation and wetting under high frequency vibration

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Article information


Submitted
06 Jun 2011
Accepted
08 Jul 2011
First published
04 Aug 2011

Soft Matter, 2011,7, 7976-7979
Article type
Communication

Substrate dependent drop deformation and wetting under high frequency vibration

O. Manor, M. Dentry, J. R. Friend and L. Y. Yeo, Soft Matter, 2011, 7, 7976
DOI: 10.1039/C1SM06054F

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