Volume 79, Number 5, September 2007
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||08 August 2007|
Wicking within forests of micropillars
Physique et Mécanique des Milieux Hétérogènes, UMR 7636 du CNRS, ESPCI - 10 rue Vauquelin, 75005 Paris, France
2 Department of Physics, Graduate School of Humanities and Sciences, Ochanomizu University Tokyo 112-8610, Japan
Accepted: 19 July 2007
We describe how a wetting liquid brought into contact with a forest of micropillars impregnates this forest. Both the driving and the viscous forces depend on the parameters of the texture (radius b and height h of the pillars, pitch p of the network) and it is found that two different limits characterize the dynamics of wicking. For small posts (), the film progresses all the faster since the posts are high, allowing a simple control of this dynamics. For tall pillars (), the speed of impregnation becomes independent of the pillar height, and becomes mainly fixed by the radius of the posts.
PACS: 68.08.Bc – Wetting / 68.35.Md – Surface thermodynamics, surface energies / 85.40.Hp – Lithography, masks and pattern transfer
© Europhysics Letters Association, 2007
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