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Vibrations and Spatial Patterns Change Effective Wetting Properties of Superhydrophobic and Regular Membranes

Mechanical Engineering Department, University of Wisconsin-Milwaukee, 3200 N Cramer St., Milwaukee, WI 53211, USA
Author to whom correspondence should be addressed.
On a sabbatical leave at The Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel
Academic Editor: Giuseppe Carbone
Biomimetics 2016, 1(1), 4;
Received: 9 June 2016 / Revised: 27 July 2016 / Accepted: 28 July 2016 / Published: 4 August 2016
(This article belongs to the Special Issue Micro- and Nano-Structured Bio-Inspired Surfaces)
Small-amplitude fast vibrations and small surface micropatterns affect properties of various systems involving wetting, such as superhydrophobic surfaces and membranes. We review a mathematical method of averaging the effect of small spatial and temporal patterns. For small fast vibrations, this method is known as the method of separation of motions. The vibrations are substituted by effective force or energy terms, leading to vibration-induced phase control. A similar averaging method can be applied to surface micropatterns leading surface texture-induced phase control. We argue that the method provides a framework that allows studying such effects typical to biomimetic surfaces, such as superhydrophobicity, membrane penetration and others. Patterns and vibration can effectively jam holes and pores in vessels with liquid, separate multi-phase flow, change membrane properties, result in propulsion, and lead to many other multiscale, non-linear effects. Here, we discuss the potential application of these effects to novel superhydrophobic membranes. View Full-Text
Keywords: vibrations; micro/nanotopography; wetting; membrane; oil-water separation vibrations; micro/nanotopography; wetting; membrane; oil-water separation
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MDPI and ACS Style

Ramachandran, R.; Nosonovsky, M. Vibrations and Spatial Patterns Change Effective Wetting Properties of Superhydrophobic and Regular Membranes. Biomimetics 2016, 1, 4.

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