McHale, Glen, Shirtcliffe, Neil, Newton, Michael, Pyatt, F. Brian and Doerr, Stefan (2007) Self-organization of hydrophobic soil and granular surfaces. Applied Physics Letters, 90 (5). 054110. ISSN 0003-6951
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Abstract
Soil can become extremely water repellent following forest fires or oil spillages, thus preventing penetration of water and increasing runoff and soil erosion. Here the authors show that evaporation of a droplet from the surface of a hydrophobic granular material can be an active process, lifting, self-coating, and selectively concentrating small solid grains. Droplet evaporation leads to the formation of temporary liquid marbles and, as droplet volume reduces, particles of different wettabilities compete for water-air interfacial surface area. This can result in a sorting effect with self-organization of a mixed hydrophobic-hydrophilic aggregate into a hydrophobic shell surrounding a hydrophilic core.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | granular, soil, water repellence, hydrophobic, evaporation, superhydrophobic |
| Subjects: | F100 Chemistry F200 Materials Science F300 Physics F800 Physical and Terrestrial Geographical and Environmental Sciences |
| Department: | Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering |
| Depositing User: | Glen McHale |
| Date Deposited: | 16 Aug 2012 16:04 |
| Last Modified: | 17 Dec 2023 12:47 |
| URI: | https://nrl.northumbria.ac.uk/id/eprint/8319 |
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