Volume 112, Number 1, October 2015
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||23 October 2015|
Liquid filmification from menisci
1 Physique et Mécanique des Milieux Hétérogènes, UMR 7636 CNRS, ESPCI ParisTech - 75005 Paris, France
2 Laboratoire d'Hydrodynamique (LadHyX), UMR 7646 CNRS, Ecole Polytechnique - 91128 Palaiseau Cedex, France
3 Air Liquide, Paris-Saclay Research Center - 1 Chemin de la Porte des Loges, 78354 Jouy-en-Josas Cedex, France
Received: 13 August 2015
Accepted: 8 October 2015
A wetting liquid brought in contact with a solid covered by microtextures invades the network of textures and fills it, creating a liquid film whose thickness is fixed by the texture height. However, this process of filmification can be opposed by the presence of surrounding menisci, residing for instance in corners at the edges of the film. We discuss the nature to be given to the texture to overcome the negative Laplace pressure associated with menisci. We also describe how the dynamics of filmification is impacted by the design of the texture, focussing on micropillars, lines and grooves, and how it can be optimized for some texture density. We conclude by discussing the distribution of textures generating a constant velocity of filmification instead of the slowing-down classically observed in impregnation processes.
PACS: 68.08.Bc – Wetting / 68.15.+e – Liquid thin films / 68.35.Ct – Interface structure and roughness
© EPLA, 2015
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