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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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: | 17 Dec 2023 12:50 |
| URI: | https://nrl.northumbria.ac.uk/id/eprint/8340 |
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