  We studied the dependence of solid deposit shape obtained by free drying of
sessile drops on the particles concentration and
Derjaguin-Landau-Verwey-Overbeek (DLVO) particle/substrate interaction. In
contrast to previous contributions using pH as a control parameter of
interactions, we investigated an unprecedentedly wide range of concentrations
and particle/substrate DLVO forces by modifying the nature of the substrate and
particles as well as their size and surface chemistry whereas long-distance
repulsive interactions between particles were maintained for most of the drying
time. Our main result is that the different shapes of deposits obtained by
modifying the particle concentration are the same in the different regimes of
concentration regardless of particle/substrate interaction in the studied range
of DLVO forces and particle concentrations. The second result is that, contrary
to expectations, the dominant morphology of dry patterns at low particle
concentration always shows a dot-like pattern for all the studied systems.
