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Insoluble surfactant spreading along thin liquid films confined by chemical surface patterns.

Physical chemistry chemical physics : PCCP (2011-04-20)
David K N Sinz, Myroslava Hanyak, Jos C H Zeegers, Anton A Darhuber
ABSTRACT

We conducted a combined experimental and numerical study of the spreading of insoluble surfactants on spatially confined thin liquid films. We found that the spreading dynamics can locally be represented by a power-law relation x∼t(α). We determine the time evolution of the liquid film thickness and the corresponding spreading exponents α both from experiments using interference microscopy and numerical finite element simulations. The lateral confinement induces non-uniform height- and surface velocity profiles, which manifest themselves in a pronounced transition of the evolving rivulet morphology. Excellent agreement between experimental and simulation results has been achieved.

MATERIALS
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Product Description

Sigma-Aldrich
Trichloro(1H,1H,2H,2H-perfluorooctyl)silane, 97%