| As a kind of reflective paper-like displays, the electrophoretic image display（EPID） has been regard as one of the most impressive flat-panel displays for its easydigital control, full-color display and flexibility. The electrophoretic display utilizeselectrically charged pigment particles （electrophoretic particles） that are dispersed in adyed dielectric medium, and optical contrast is achieved by moving the particlesunder an applied electric filed. The properties of electrophoretic particles determineperformance and service life of EPID.The hybrid nanoparticles （TiO2-HNPs） with TiO2nanoparticles as core and withpoly（N,N-dimethylaminoethyl methacrylate-co-methyl methacrylate） by usingtriallylamine as cross-linking agent as shell were firstly prepared via atom transferradical polymerization （ATRP） in this article. Then the hybrid nanoparticles withpositive charge were produced by the quaternization with methyl iodide asquaternization reagent. The cationic hybrid nanoparticles （TiO2-CHNPs） were studiedby means of transmission electron microscopy （TEM）, scanning electron microscopy（SEM）, fourier-transform infrared （FTIR） spectroscopy and dynamic light scattering（DLS） measurements. The zeta potential, the contrast ratio of white state to dark stateand response time of TiO2-CHNPs are+16.8mV,30and3s, respectively.Another kind of electrophoretic particles, composed of TiO2/SiO2（core） andcationic polymer （shell）, are prepared via atom transfer radical polymerization （ATRP）in methanol and quaternization in acetonitrile. Then, modification of the obtainedTiO2/SiO2via surface-initiated ATRP was carried out. Finally, cationic hybrid NPs（TiO2/SiO2-CHNPs） were prepared by the quaternization with methyl iodide. Theproductions were studied by the same methods of TiO2-CHNPs. The results indicatethat with the improvement of silica content, the zeta potential, the contrast ratio ofwhite state to dark state and response time of TiO2/SiO2-CHNPs change from23.2mV,36,2.8s to28.1mV,40,2.6s. |
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