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Interfacial Phenomena and Heat Transfer
ESCI SJR: 0.258 SNIP: 0.574 CiteScore™: 0.8

ISSN Imprimir: 2169-2785
ISSN En Línea: 2167-857X

Interfacial Phenomena and Heat Transfer

DOI: 10.1615/InterfacPhenomHeatTransfer.2013010169
pages 215-230

WETTING ON GELS: HOWTHE GEL CHARACTERISTICS AFFECT THE CONTACT LINE DYNAMICS

Tadashi Kajiya
Max Planck Institute; Laboratoire MSC, UMR 7057 CNRS, Université Paris Diderot, Batiment Condorcet, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
Philippe Brunet
Laboratoire MSC, UMR 7057 CNRS, Université Paris Diderot, Batiment Condorcet, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
Adrian Daerr
Laboratoire MSC, UMR 7057 CNRS, Université Paris Diderot, Batiment Condorcet, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
Laurent Royon
Laboratoire MSC, UMR 7057 CNRS, Université Paris Diderot, Batiment Condorcet, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France
Tetsuharu Narita
PPMD-SIMM, UMR 7615, CNRS, UPMC, ESPCIParisTech, 10 rue Vauquelin, 75231 Paris Cedex 05, France
Francois Lequeux
PPMD-SIMM, UMR 7615, CNRS, UPMC, ESPCIParisTech, 10 rue Vauquelin, 75231 Paris Cedex 05, France
Laurent Limat
Laboratoire MSC, UMR 7057 CNRS, Université Paris Diderot, Batiment Condorcet, 10 rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France

SINOPSIS

In this article, we summarize a series of experimental works and qualitative modelling regarding the dynamics of a liquid contact line on gel substrates. Two different situations were investigated, i.e., water on hydrophilic poly (2-acrylamido-2-methyl-propane-sulfonic acid-co-acrylamide) (PAMPS−PAAM) gels and water on hydrophobic poly (styrene-butadienestyrene)(SBS)−paraffin gels. In both situations, different gel characteristics largely affect the contact line dynamics: liquid diffusion and surface deformation by capillary force. On hydrophilic gels, the contact line of a sessile droplet exhibits successively two different behaviors: pinned and receding, and the transition between the behaviors is closely related to the local deformation of the gel surface due to swelling. On hydrophobic gels, the contact line exhibits several different regimes of motions, i.e., stick-slip, and two continuous motions. These transitions are characterized by a frequency f built upon the apparent contact line velocity v and the droplet radius R as f = v/R, indicating that the gel rheology largely affects the dynamics of liquid contact line. Our results provide a synthetic view of the characteristic features of how the wetting is different on gel surfaces. Finally, we designate unsolved problems and future directions.


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