Preparation and Characterization of Electronic Inks Encapsulation for Microcapsule-type Electrophoretic Displays (EPDs)

Dong-Guk Yu; Sang-Hyo Kim; Jeong-Ho An

Journal of Industrial and Engineering Chemistry, Vol.13, No.3, 438-443, May, 2007

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Preparation and Characterization of Electronic Inks Encapsulation for Microcapsule-type Electrophoretic Displays (EPDs)

Dong-Guk Yu, Sang-Hyo Kim¹, and Jeong-Ho An^†

Department of Polymer Science and Engineering, SungKyunKwan University, Kyunggi-do 440-746, Korea
¹Gahon Bionano Research Institute, Kyungwon University, Kyunggi-do, 461-201, Korea

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Electrophoretic displays based on electronic inks are promising candidates for electronic-paper applications because of their excellent ink-on-paper quality. Microcapsules containing polymer-coated titanium dioxide and green electronic ink suspensions as core materials were fabricated via complex coacervation using gelatin/acacia as the wall materials. The gelatin/acacia microcapsules were characterized in terms of their microstructure, morphologies, thermal properties, and electrophoretic display cell structure by means of optical microscopy, confocal laser scanning microscopy (CLSM), and thermogravimetic analysis (TGA). The experimental results reveal that the polymer-coated white electronic inks in the microcapsules moved toward the positive electrode, but were pulled back in the opposite direction when the polarity was reversed.

Keywords:electrophoretic display;microcapsules;polymer-coated titanium dioxide;green electronic ink;complex coacervation

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[Related Articles]

[1] Kawai H, Kane N, Proc. SID 99 Dig., 1102 (1999)

[2] Nakamura E, Kawai H, Kane N, Proc. SID 98 Dig., 1014 (1998)

[3] Drzaic P, Comiskey B, Albert JD, Zhang L, Loxley A, Feeney R, Jacobson J, Proc. SID 98 Dig., 1131 (1998)

[4] Chen Y, Kazlas P, Ritter J, J. Proc. SID 2002 Dig., 495 (2002)

[5] Jo GR, Hoshino K, Kitamura T, Chem. Mater., 14, 664 (2002)

[6] Comiskey B, Albert JD, Yoshizawa H, Jacobson J, Nature, 253, 394 (1998)

[7] Kamiyama M, Maeda M, Totsuka T, J. Imag. Sci. Technol., 39, 433 (1995)

[8] Crowley JM, Sheridon NK, Romano L, J. Electrostatics, 55, 247 (2002)

[9] Bojinov VB, Grabchev IK, Org. Lett., 5, 2185 (2003)

[10] Vykoukal J, Vykoukal DM, Sharma S, Becker FF, Gascoyne PRC, Langmuir, 19(6), 2425 (2003)

[11] Hays DA, J. Electrostatics, 51, 57 (2001)

[12] Xu JM, Synth. Met., 115, 1 (2000)

[13] Hays RA, Feenstra BJ, Nature, 425, 383 (2003)

[14] Lampert CM, Sol. Energy Mater. Sol. Cells, 76, 489 (2003)

[15] Rogers JA, Bao Z, J. Polym. Sci. A: Polym. Chem., 40(20), 3327 (2002)

[16] Chen Y, Au J, Kazlas P, Ritenour A, Gates H, McCreary M, Nature, 423, 136 (2003)

[17] Kim KS, Vincent B, Cosgrove T, J. Ind. Eng. Chem., 12(1), 91 (2006)

[18] Yu DG, An JH, Polymer, 45(14), 4761 (2004)

[19] Yu DG, An JH, J. Polym. Sci. A: Polym. Chem., 42(22), 5608 (2004)