2012/09/05 by Nirmalendu Ganai, Arnab Saha, Ganai, Nirmalendu +3
Earth and Planetary Sciences · Engineering · Materials Science · Physics and Astronomy · #Nanomaterials and Printing Technologies #Solidification and crystal growth phenomena #cond-mat.soft #nanoparticles nucleation surface interactions
paper · pdf · doi:10.48550/arxiv.1209.0919
arxiv created 2012/09/05 · arxiv updated 2012/09/06
Using a phase field crystal model we study the structure and dynamics of a drop of colloidal suspension during evaporation of the solvent. We model an experimental system where contact line pinning of the drop on the substrate is non-existent. Under such carefully controlled conditions, evaporation of the drop produces an ordered or disordered arrangement of the colloidal residue depending on the initial average density of solute and the drying rate. We obtain a non-equilibrium phase boundary showing amorphous and crystalline phases of single component and binary mixtures of colloidal particles in the density- drying rate plane. While single component colloids order in the two dimensional triangular lattice, a symmetric binary mixture of mutually repulsive particles orders in a three sub-lattice order where two of the sub-lattices of the triangular lattice are occupied by the two species of particles with the third sub-lattice vacant.