• Title/Summary/Keyword: electrophoretic

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Preparation of Colored Electrophoretic Nanoparticles by Emusifier-Free Emulsion Polymerization and Reactive Dyeing (무유화 에멀젼 공중합법과 반응염법을 이용한 전기영동 고분자 컬러나노입자의 제조)

  • Chon, Jin-A;Ha, Jae-Hee;Lim, Min-Ho;Kwon, Yong-Ku
    • Polymer(Korea)
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    • v.34 no.6
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    • pp.491-494
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    • 2010

  • Colored, electrophoretic polymer nanoparticles of poly (styrene-co-divinylbenzene-co-vinyl acetate)[poly(St-co-DVB-co-VAc)] were prepared by emulsifier-free emulsion co-polymerization and reactive dyeing. The emulsifier-free emulsion polymerization of styrene, divinyl benzene and vinyl acetate was carried out at $70^{\circ}C$ for 20 hrs to obtain monodisperse polymer nanoparticles of poly(St-co-DVB-co-VAc) with an average diameter of 180~200 nm. These nanoparticles were transformed into poly(styrene-co-divinylbenzene-co-vinyl alcohol) [poly(St-co-DVB-co-VA)] nanoparticles through the saponification reaction. The poly(St-co-DVB-co-VA) nanoparticles were treated with reactive dyes to obtain the colored, monodisperse electrophoretic nanoparticles, and their morphology and surface charge were characterized by scanning electron microscopy, differential scanning calorimetry, UV/Vis absorbance and zeta-potentiometry.

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Analysis on Current Characteristics According to Injection Method and Driving Waveform in Electrophoretic-Type E-Paper Display (전기영동형 전자종이 디스플레이에서 전자잉크의 주입 방법 및 구동파형에 따른 전류 특성 분석)

  • Lee, Joo-Won;Kim, Young-Cho
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.33 no.5
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    • pp.386-392
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    • 2020

  • In this study, the drift current characteristics of charged particles are analyzed for panels fabricated by varying the waveform biasing of the active particle loading method (APLM), which is a method driven by the electrophoretic principle of loading charged particles into a cell of a barrier rib-type electronic paper. We prepare 3 panels using APLM and 1 panel without APLM. The waveform of APLM uses square wave and ramp wave, and the step voltage wave is applied to the driving voltage. The drift currents measured from the square wave and ramp wave with the same period applied by APLM are 4.872 µC and 5.464 µC, respectively, and the ramp wave is shown to be relatively advantageous for loading charged particles that have a large q/m. The time-current curve results confirm that the abrupt movement of charged particles is occurring. When the step form wave signal with a short time of 1s is first applied, initial large movement of the charged particles is confirmed to occur in all samples, which is understood as the effect of applying the voltage necessary to remove the imaging force. The results of this study are expected to improve the loading of charged particles into the electronic paper cell, driven by the electrophoretic principle and optimization of the driving conditions.

  • https://doi.org/10.4313/JKEM.2020.33.5.386 인용 PDF KSCI