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Drying a droplet of colloidal dispersion can result in complex patternformation due to both development and deformation of a skin at the dropsurface. The present study focus on the drying process of droplets of colloidaldispersions in a confined geometry where direct observations of the skinthickness are allowed. During the drying, a buckling process is followed by asingle depression growth inside the drop. The deformation of the droplet isfound to be generic and is studied for various colloidal dispersions. The finalshape can be partly explained by simple energy analysis based on thecompetition between bending and stretching deformations. Particularly, thefinal shape enables us to determine precisely the critical thickness of theshell for buckling. This study allow us to validate theory in 2D droplets andapply it to the case of 3D droplets where the thickness is not accessible bydirect observation.

The buckling and invagination process during consolidation of colloidal droplets