title: Fabrication and characterization of core-shell structured black pigment particles for electrophoretic display.
abstract: To prepare electrophoretic black particles with good suspension stability in the low dielectric medium for the electrophoretic display application, black pigment (B444) as a core material and polystyrene (PS) as a shell material were prepared via dispersion polymerization of styrene, and then the fabricated B444/PS composite particles were positively charged with 2-(methacryloyloxy) ethyl trimethylammonium chloride. Morphology of the B444/PS core-shell particles was observed by scanning electron microscopy, while their chemical structure was confirmed via an FT-IR. Maximum values of the electrophoretic mobility and zeta potential observed by dynamic light scattering reach 4.46 x 10(-6) m2/Vs and 30.23 mV in a low dielectric medium, respectively. The resulting B444/PS particles also showed good electrophoretic movement in the B444/PS particle embedded microcapsules. Therefore, it can be applied in the dual-particle electrophoretic dispersion together with negative charged TiO2, showing black and white images.
authors.affiliation: Department of Polymer Science and Engineering, Inha University, Incheon 402-751, Korea.
authors.forename: Young Jae
authors.initials: YJ
authors.lastname: Kim
authors.forename: Hyoung Hoon
authors.initials: HH
authors.lastname: Sim
authors.forename: Hyoung Jin
authors.initials: HJ
authors.lastname: Choi
authors.forename: Young Suh
authors.initials: YS
authors.lastname: Yoon