Cooling-Rate-Controlled Colloidal Arrangement between Crystal and Glass in Spherical Confining Geometry
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Photonic Microcapsules with varying optical responses depending on thermal history can be designed. Thermally responsive colloidal particles confined in double emulsion are formed with colloidal assembly when it exceeds a certain volume fraction in the drops. The particles consist of Polystyrene core and hydrogel polymer shell that have lower critical solution temperature (LCST). When temperature drops below LCST, the colloidal particles are swollen and colloidal self-assembly takes place. Herein, we can modulate the rate of cooling and cause different colloidal crystallinity. Slower cooling rate induces higher crystallinity in colloidal arrangement inside the microcapsule. If the temperature decrease is slow enough, the arrangement of colloid form a crystalline phase, and fast enough temperature decrease forms glass packing. Therefore, the microcapsules can record their thermal history by showing unique optical responses.