Effect of the initial particle volume fraction on the structure of a drying colloidal depositReport as inadecuate




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* Corresponding author 1 IPR - Institut de Physique de Rennes

Abstract : During the drying of a droplet on a substrate, dispersed colloidal particles are advected towards the contact line and then accumulate in its vicinity, forming in this way a ring-shaped deposit. Up to now, the structural properties at the particle scale of such pattern have been provided only by its final inspection at the end of the drying process. Here we follow all the stage of the ring formation, up to the complete drying, and for different particle volume fractions. We show that for low particle volume fractions, the final structure of the ring is always disordered, which results only from capillary attraction due to the deformation of the air-water interface. In contrast, for higher particle volume fractions, above 10−4, different consecutive rearrangements lead eventually to the formation of a ring with an ordered structure. © 2016 Elsevier B.V.

Keywords : Air Colloids Deformation Deposits Drying Phase interfaces Air water interfaces Capillary attraction Colloidal assembly Colloidal deposits Colloidal particle Meniscus deformation Order-to-disorder transitions Particle volume fractions Volume fraction





Author: Janine Emile - Hervé Tabuteau -

Source: https://hal.archives-ouvertes.fr/



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