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Controlling the buckling instability of drying droplets of suspensions through colloidal interactions

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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Submitted on : Tuesday, April 14, 2015 - 11:35:46 AM
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É. Lintingre, G. Ducouret, F. Lequeux, L. Olanier, T. Périé, et al.. Controlling the buckling instability of drying droplets of suspensions through colloidal interactions. Soft Matter, Royal Society of Chemistry, 2015, 11 (18), pp.3660-3665. ⟨10.1039/C5SM00283D⟩. ⟨hal-01141980⟩

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