| 초록 |
Spherical colloidal clusters form various crystalline lattices by spontaneous assembly depending on crystal size, interparticle potential, etc. These clusters have different photonic and mechanical properties compared with bulk film shapes. The curved surface of clusters shows varied crystalline structure combinations. Formation control of structural types of the cluster, such as face-centered cubic (FCC), icosahedron, and decahedron, is a challenging topic.In this work, we present a novel method to emulsion concentration and cluster formation process as the various number of colloidal particles and changing repulsion interaction. Using microfluidic device, two kinds of monodisperse water-in-oil (W/O) single emulsion droplets are produced. As the core water phase, the one contains negatively charged polystyrene nanoparticles (PS NPs) dispersion and the other one contains sodium chloride solution. The PS NPs dispersion emulsions are concentrated after gathering two kinds of emulsions. Repulsion interaction can be controlled by adding salt to PS NPs dispersion. we can investigate the crystalline formation process depending on the interparticle interaction and concentration speed. |
