Dynamics of rigid microparticles at the interface of co-flowing immiscible liquids in a microchannel.

摘要: We report the dynamical migration behavior of rigid polystyrene microparticles at an interface co-flowing streams primary CP1 (aqueous) and secondary CP2 (oils) immiscible phases low Reynolds numbers (Re) in a microchannel. The initially suspended either continue to flow bulk or migrate across into CP2, when stream width approaches diameter microparticles. Experiments were performed with different it is found that criterion depends on sign spreading parameter S presence surfactant interface. To substantiate criterion, experiments also carried out by suspending (oil phase). Our study reveals case aqueous-silicone oil combination, get attached since 90°. For complete detachment from phase, additional energy ΔG needed. discuss role interfacial perturbation, which causes In mineral olive oils, surfactants present prevents attachment due repulsive disjoining pressure. Finally, using system, we demonstrate size based sorting 25μm 15μm respectively 10μm variation separation efficiency η ratio aqueous ρ.