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Published on: May 20, 2014
Controlling the buckling instability of drying droplets of suspensions through colloidal interactions
É Lintingre1, G Ducouret, F Lequeux
1École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris ParisTech, PSL Research University, Sciences et Ingénierie de la matière Molle, CNRS UMR7615, 10, Rue Vauquelin, F-75231 Paris Cedex 05, France. laurence.talini@espci.fr.
Abstract:
The present study focuses on the drying of droplets of colloidal suspensions using the Leidenfrost effect. At the end of drying, grains show different morphologies: cups or spheres depending on the ionic strength or zeta potential of the initial suspension. High ionic strengths and low absolute zeta potential values lead to spherical morphologies. A model based on the calculations of DLVO potentials has been implemented to extract a critical pressure, which provides a quantitative criterion for buckling whatever the initial formulation is. Particularly, the buckling time is quantitatively predicted from the interparticle interactions and shows an excellent agreement with experimental values.
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