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Dips and rims in dried colloidal films

Dips and rims in dried colloidal films C. Parneix, P. Vandolaeghe, D. Quéré, V. Nikolayev, B. Cabane Laboratoire PMMH, CNRS UMR 7636, ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 05 bcabane@pmmh.espci.fr. Progression of the drying front. Liquid films and coatings. . ?. ?.

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Dips and rims in dried colloidal films

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  1. Dips and rims in dried colloidal films C. Parneix, P. Vandolaeghe, D. Quéré, V. Nikolayev, B. Cabane Laboratoire PMMH, CNRS UMR 7636, ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 05 bcabane@pmmh.espci.fr Progression of the drying front Liquid films and coatings  ? ? Edge effects (“coffee stain transport”) Obstruction effects (“evaporative lithography”) Effect of a localized obstruction? R ~ mm h e ~ µm Conclusions • Coatings are made through evaporation of colloidal dispersions • Evaporation is never uniform with consequences for coatings R. D. Deegan, O. Bakajin, T. F. Dupont, G. Huber, S. R. Nagel, and T. A. Witten, Phys. Rev. E 62, 756 (2000). D. J. Harris and J. A. Lewis, Langmuir 24, 3681 (2008). Dip at the position of the optical fiber Dip profile measured with the optical fiber Dip profile measured with the height scanner This effect probably is a significant nuisance in those cases where it is desired to make a flat film. This effect however presents a simple way to structure the surface of films of nanometric thickness in a controlled way to provide the particular optical, electrical or other properties.

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