A Novel Method of Fabricating, Adjusting, and Optimizing Polystyrene Colloidal Crystal Nonspherical Microparticles from Gas–Water Janus Droplets in a Double Coaxial Microfluidic Device

The optical properties of close-packed colloidal crystal particles could be improved and controlled via adjusting their shape, by first forming colloidal suspension−gas Janus droplets with different structures in a double coaxial microfluidic device, and then solvent-extraction-derived self-assembly to form nonspherical microparticles with different shapes.