Self-organization of hydrophobic soil and granular surfaces

MCHALE, G., SHIRTCLIFFE, N.J., NEWTON, M.I., PYATT, F.B. and DOERR, S.H., 2007. Self-organization of hydrophobic soil and granular surfaces. Applied Physics Letters, 90 (5). ISSN 0003-6951


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Soil can become extremely water repellent following forest fires or oil spillages, thus preventing penetration of water and increasing run-off 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 wettability compete for water-air interfacial surface area. This can result in a sorting effect with self-organisation of a mixed hydrophobic-hydrophilic aggregate into a hydrophobic shell surrounding a hydrophilic core.

Item Type: Journal article
Description: Post-print
Publication Title: Applied Physics Letters
Creators: McHale, G., Shirtcliffe, N.J., Newton, M.I., Pyatt, F.B. and Doerr, S.H.
Publisher: American Institute of Physics
Place of Publication: Melville, NY
Date: 2007
Volume: 90
Number: 5
ISSN: 0003-6951
Rights: Copyright ©2007 American Institute of Physics
Divisions: Schools > School of Science and Technology
Depositing User: EPrints Services
Date Added: 09 Oct 2015 09:43
Last Modified: 23 Aug 2016 09:05

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