Wicking in a Powder | Zendy

Paul Raux | Zendy; Héloise Cockenpot | Zendy; Marco Ramaioli | Zendy; David Quéré | Zendy; Christophe Clanet | Zendy

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Wicking in a Powder

Author(s) -

Paul Raux,

Héloise Cockenpot,

Marco Ramaioli,

David Quéré,

Christophe Clanet

Publication year - 2013

Publication title -

langmuir

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.042

H-Index - 333

eISSN - 1520-5827

pISSN - 0743-7463

DOI - 10.1021/la400015v

Subject(s) - wetting , contact angle , dispersity , materials science , wetting transition , composite material , nanotechnology , polymer chemistry

We investigate the wicking in granular media by considering layers of grains at the surface of a liquid and discuss the critical contact angle below which spontaneous impregnation takes place. This angle is found to be on the order of 55° for monodisperse layers, significantly smaller than 90°, the threshold value for penetrating assemblies of tubes. Owing to geometry, impregnating grains is more demanding than impregnating tubes. We also consider the additional effects of polydispersity and pressure on this wetting transition and discuss the corresponding shift observed for the critical contact angle.

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