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Size tuned electrophoretic pyrazoline nanoparticles prepared through dispersion-polymerization.

Sun Wha Oh1, Chang Woo Kim, Se-Mo Son

  • 1Department of Chemistry, Pukyong National University, Busan 608-737, Republic of Korea.

Journal of Colloid and Interface Science
|February 22, 2011
PubMed
Summary

Researchers created uniform electrophoretic particles for displays using dispersion-polymerization. Particle size and electrophoretic mobility were controlled by surfactant concentration, achieving optimal performance for 400 nm particles.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Electrophoretic displays (EPDs) require precisely controlled particles for optimal performance.
  • Dispersion-polymerization offers a route to synthesize monodisperse polymer particles.
  • Controlling particle size and surface charge is crucial for electrophoretic mobility.

Purpose of the Study:

  • To synthesize highly monodispersed electrophoretic particles via dispersion-polymerization.
  • To investigate the effect of surfactant concentration on particle size and electrophoretic mobility.
  • To evaluate the performance of fabricated particles in electrophoretic display cells.

Main Methods:

  • Dispersion-polymerization of methyl methacrylate and ethylene glycol dimethacrylate in a methanol-water mixture.

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  • Incorporation of pyrazoline nanoparticles as a core or template.
  • Use of stearic acid as a surfactant and charge-controlling additive.
  • Characterization of particle size and measurement of electrophoretic mobility.

    • Main Results:

    • Successfully synthesized monodisperse electrophoretic particles ranging from 160 to 550 nm.
    • Particle size was tunable by adjusting stearic acid surfactant concentration.
    • Maximum electrophoretic mobility of -7.513×10(-5) cm(2)/Vs achieved for 400 nm particles with 1.5 wt.% stearic acid.
    • Electrophoretic display cells exhibited favorable current-voltage characteristics and color change.

    Conclusions:

    • Dispersion-polymerization is an effective method for producing controlled electrophoretic particles.
    • Stearic acid plays a dual role in controlling particle size and electrophoretic mobility.
    • The developed electrophoretic particles are suitable for applications in electrophoretic displays.