Various Micro-encapsulation Techniques of Photonic Inks for Electrophoretic Display
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In this study, we synthesized superparamagnetic iron oxide nanoparticles (SPION) with a core-shell structure (Fe3O4@SiO2), which is an essential materials for photonic ink used for full color electrophoretic display (EPD). This kind of ink exhibits tunable reflection colors as the distance of particles changes as external force is applied. Having a high refractive index, SPION with a monodisperse size in liquid medium can show the clear and sharp structural color. Photonic ink is a colloidal dispersion of SPION in non-polar medium. In aqueous medium, electrolysis or any other chemical reaction can happen. SPION arranges into a crystalline colloidal array (CCA) in the presence of charge stabilizing agent in non-polar medium However, liquid phase ink has a risk of drying when exposed to air, so the CCA can be broken to loose structural color. Therefore, in order to enhance the processability, micro-encapsulation of CCA is necessary. In this study, we try various encapsulation methods using biopolymers.