| 초록 |
Photonic crystals exhibit unique optical properties which arise from their periodic nanostructure. Colloidal crystallization provides the most facile and economic way to create such periodic structure. However, most colloidal crystals have been prepared in a form of thin film, which limits mechanical stability and ease of processing. To address this problem, we encapsulate colloidal particle into the core of double-emulsion droplets with a microfluidic method to create photonic capsules. The drops are subjected to hypertonic condition, thereby concentrating the colloids in the droplets. The rate of concentration significantly influences the internal structure of the droplets; slow concentration yields highly ordered array of colloids, whereas fast concentration yields disordered structure. Both colloidal crystals and glasses display photonic effect with distinctive appearance. Colloidal crystals show sparkling color, whereas colloidal glasses show less-iridescent color. |
