Spreading of liquid drops on Agar gels |
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Authors: | M Banaha A Daerr and L Limat |
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Institution: | (1) Laboratoire Matière et Systèmes Complexes (MSC), UMR 7057, CNRS & Université Paris Diderot, Bat. Condorcet CC7056, 75205 Paris Cedex 13, France |
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Abstract: | 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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Keywords: | |
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