Topography driven spreading

McHale, Glen, Shirtcliffe, Neil, Aqil, Sanaa, Perry, Carole and Newton, Michael (2004) Topography driven spreading. Physical Review Letters, 93 (3). 036102. ISSN 0031-9007

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.93.036102

Abstract

Roughening a hydrophobic surface enhances its nonwetting properties into superhydrophobicity. For liquids other than water, roughness can induce a complete rollup of a droplet. However, topographic effects can also enhance partial wetting by a given liquid into complete wetting to create superwetting. In this work, a model system of spreading droplets of a nonvolatile liquid on surfaces having lithographically produced pillars is used to show that superwetting also modifies the dynamics of spreading. The edge speed-dynamic contact angle relation is shown to obey a simple power law, and such power laws are shown to apply to naturally occurring surfaces.

Item Type: Article
Uncontrolled Keywords: water-repellent, surfaces, dynamics, roughness, contact angle, drop, wicking, hemi-wicking
Subjects: F100 Chemistry
F200 Materials Science
F300 Physics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Glen McHale
Date Deposited: 23 Aug 2012 14:19
Last Modified: 25 Oct 2017 05:38
URI: http://nrl.northumbria.ac.uk/id/eprint/8340

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