Simple Model of Shape Evolution of Desiccated Colloidal Sessile Drop
  We propose simple model of colloidal sessile drop desiccation. The model describes correctly both evolution of the phase boundary between sol and gel inside such a drop and the final shape of the dried film (deposit). The model is based on mass conservation and natural assumption that deposit (gel phase) prevents flows and evaporation. 
Yu. Yu. Tarasevich, I. V. Vodolazskaya, and O. P. Isakova
cond-mat.soft