Coffee Ring Effect During Drying of Colloid Drop: Experiment and Computer Simulation

Formation of the ring-like patterns of silver nanoparticles (NPs) during drying of colloid drop caused by coffee ring effect has been studied experimentally and by computer simulation. The drop shape evolution during jump-like motion of its contact line was in situ observed. Two interleaved stages of the drop shape evolution were separated for computer simulation. The odd stages represent decreasing of drop height at constant base radius and the even stages - the fast shift of the contact line at the constant volume. The proposed model allows extracting the parameters characterizing formation of NPs pattern during drying of colloid drop.