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Communication Dans Un Congrès Année : 2009

Spreading of liquid drops on Agar gels

Adrian Daerr
Laurent Limat

Résumé

We study the spreading of pure water drops or water drops with surfactine (surfactant produced by bacteria Bacillus Subtilis) on gels (Agar/Water gel). We find that, surprisingly, the drops do not spread indefinitely, but remain in a state of partial wetting. Eventually the liquid diffuses into the gel on a time scale short with respect to evaporation times. The drops containing surfactant show a complex dynamics: at first the spreading velocity decreases, until the front stops and starts receding at about constant velocity. Concurrently, a second front detaches from the rim of the drop if the agar concentration is sufficiently low, and continues to move outwards.
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Dates et versions

hal-00357826 , version 1 (02-02-2009)

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Mehdi Banaha, Adrian Daerr, Laurent Limat. Spreading of liquid drops on Agar gels. European Coating Symposium 2007, Sep 2007, Paris, France. pp.185-188, ⟨10.1140/epjst/e2009-00904-1⟩. ⟨hal-00357826⟩
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