Red electrophoretic particles based on Fe₂O₃ nanoparticles for electronic inks: Design, preparation and properties

Abstract

In order to modify inorganic particles as chromatic electrophoretic particles, an approach was designed and used to prepare Fe₂O₃ red electrophoretic particles. These Fe₂O₃-cationic hybrid nanoparticles(Fe₂O₃-CHNPs)were prepared through Fe₂O₃ core covered with polymer shell which was composed of SiO₂ and P(DMAEMA-co-HMA) by using atom transfer radical polymerization(ATRP)technique. The SiO₂-coating could introduce the functional group on the surfaceof inorganic particles, through which the polymer shell could be formed by using ATRP technique. The results of Fourier transform infrared spectra(FT-IR), X-ray photoelectron spectroscopy(XPS)and thermal gravimetric analysis(TGA)confirmed the chemical compositions of Fe₂O₃-CHNPs; the images of transmission electron microscopy(TEM)indicated the core-shell structure of Fe₂O₃-CHNPs; the measurements of dynamic light scattering(DLS)showed a 253.7 nm average particle size with narrow size distribution; and the zeta potential measurements identified the high chargeability of Fe₂O₃-CHNPs. Furthermore, the resulting nanoparticles were successfully applied in the electrophoretic display cell, which demonstrated that it was an effective approach to preparing chromatic electrophoretic particles.

Keywords

Fe₂O₃ / electrophoretic particles / ATRP / chromatic display

References

[1] Ota I, Ohnishi J, Yoshiyama M. Electrophoretic image display (EPID) panel[J]. Proceedings of IEEE, 1973, 61(7): 832-838.

[2] Comiskey B, Albert J D, Yoshizawa H, et al. An electrophoretic ink for all-printed reflective electronic displays[J]. Nature, 1998, 394(6690): 253-258.

[3] Chen Y, Au J, Kazlas P, et al. Flexible active-matrix electronic ink display[J]. Nature, 2003, 423(6936): 136-142.

[4] Werts M P L, Badila M, Brochon C, et al. Titanium dioxide-polymer core-shell particles dispersions as electronic inks for electrophoretic displays[J]. Chemistry of Materials, 2008, 20(4): 1292-1298.

[5] Meng X, Tang F, Peng B, et al. Monodisperse hollow tricolor pigment particles for electronic paper[J]. Nanoscale Research Letters, 2010, 5(1): 174-183.

[6] Kim C A, Joung M J, Ahn S D, et al. Microcapsules as an electronic ink to fabricate color electrophoretic displays[J]. Synthetic Metals, 2005, 151(3): 181-186.

[7] Wen T, Meng X, Li Z, et al. Pigment-based tricolor ink particles via mini-emulsion polymerization for chromatic electrophoretic displays[J]. Journal of Materials Chemistry, 2010, 20(37): 8112-8119.

[8] Badila M, Hebraud A, Brochon C, et al. Design of colored multilayered electrophoretic particles for electronic inks[J]. ACS Applied Materials & Interfaces, 2011, 3(9): 3602-3610.

[9] Park L S, Park J W, Choi H Y, et al. Fabrication of charged particles for electrophoretic display[J]. Current Applied Physics, 2006, 6(4): 644-652.

[10] Li D, Le Y, Hou X Y, et al. Colored nanoparticles dispersions as electronic inks for electrophoretic display[J]. Synthetic Metals, 2011, 161(13/14): 1270-1275.

[11] Dai R, Wu G, Chen H. Stable titanium dioxide grafted with poly N-(p-vinyl benzyl) phthalimide composite particles in suspension for electrophoretic displays[J]. Colloid and Polymer Science, 2011, 289(4): 401-408.

[12] Wang H, Geng W C. Preparation of monodispersed alpha-Fe₂O₃ nanoparticles by a hydrothermal synthetic route[J]. Research on Chemical Intermediates, 2011, 37(2–5): 523-532.

[13] Liu S, Wu G, Chen H Z, et al. Preparation and characterization of Fe₃O₄/SiO₂ particles for dual-particle electrophoretic display[J]. Synthetic Metals, 2012, 162(1/2): 89-94.

[14] Wen Z, Feng Y, Li X, et al. Fabrication of diarylide yellow pigments/modified SiO₂ core-shell hybrid composite particles for electrophoretic displays[J]. Current Applied Physics, 2012, 12(1): 259-265.

[15] Zhou L, Yuan W, Yuan J, et al. Preparation of double-responsive SiO₂-g-PDMAEMA nanoparticles via ATRP [J]. Materials Letters, 2008, 62(8/9): 1372-1377.

[16] Zhang F, Xu F J, Kang E T, et al. Modification of titanium via surface-initiated atom transfer radical polymerization (ATRP) [J]. Industrial & Engineering Chemistry Research, 2006, 45(9): 3067-3073.

[17] Wang Y, Zhang X, Yan J, et al. Surface modification of hydroxyapatite with poly(methyl methacrylate) via surface-initiated ATRP[J]. Applied Surface Science, 2011, 257(14): 6233-6241.

[18] Ramakrishnan A, Dhamodharan R, Ruhe J. Controlled growth of PMMA brushes on silicon surfaces at room temperature[J]. Macromolecular Rapid Communications, 2002, 23(10/11): 612-618.

[19] Lee A S, Gast A P, Butun V, et al. Characterizing the structure of pH dependent polyelectrolyte block copolymer micelles[J]. Macromolecules, 1999, 32(13): 4302-4312.

[20] Lee S B, Russell A J, Matyjaszewski K. ATRP synthesis of amphiphilic random, gradient, and block copolymers of 2-(dimethylamino)ethyl methacrylate and n-butyl methacrylate in aqueous media[J]. Biomacromolecules, 2003, 4(5): 1386-1393.