Mixed Cassie-Baxter wetting states on a porous material stabilized by electrowetting

Electrowetting is used to force imbibition in model porous plates. These porous plates are sintered disordered bronze bead packings that are homogeneously coated with a constant-thickness layer of parylene. Cycles of increasing and decreasing voltage trigger the imbibition of a ionized water sessile...

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Bibliographic Details
Published in:Europhysics letters 2017-07, Vol.119 (2), p.26004
Main Authors: Lambert, Jérôme, Gauchet, Lucien, Crassous, Jérôme
Format: Article
Language:English
Subjects:
68.08.Bc
68.35.Ct
Astrophysics
Contact angle
Imbibition
Physics
Porous materials
Porous plates
Sintering (powder metallurgy)
Thickness
Wetting
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Summary:Electrowetting is used to force imbibition in model porous plates. These porous plates are sintered disordered bronze bead packings that are homogeneously coated with a constant-thickness layer of parylene. Cycles of increasing and decreasing voltage trigger the imbibition of a ionized water sessile drop by changing its contact angle with the porous material from non-wetting to wetting shapes. During a cycle, a drop experiences partial imbibition and a strong hysteresis of its contact angle with the porous plate. Since the imbibition process quickly stabilizes, we adopt an equilibrium description of the wetting properties of the drop on the porous plate. Our model, based on the Cassie-Baxter approach, shows that three different wetting states are experienced by the drop, one of which being made possible only by the modification of the contact angle inside the pores. Our model describes the experimental results very well.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/119/26004