Microencapsulated electric ink using gelatin/gum arabic

Abstract Gelatin/gum arabic (GA) microcapsules were prepared by a convenient one step complex coacervation, in which TiO2 nanoparticles modified by stearic acid (SA) and homodispersed in tetrachloroethylene (TCE) were encapsulated. The modified TiO2 was characterized by Fourier transform infrared spectroscopy (FT-IR), dynamic light scattering (DLS) and optical microscopy, etc. And the effects of various microencapsulation parameters were also experimentally investigated. It was shown that SA-coated TiO2 nanoparticles are capable of subsidence-resistance in TCE as the SA is bonded to the surface of TiO2 nanoparticles through esterification. In addition, under the optimal encapsulated condition, the microcapsules can be prepared with regular morphology and transparent and smooth surface. Finally, the particles in microcapsules possessed reversible response to dc electric field and the response time is ∼280 ms.

[1]  Jiyoung Oh,et al.  Microcapsules as an electronic ink to fabricate color electrophoretic displays , 2005 .

[2]  S. Martelli,et al.  Methoxybutropate microencapsulation by gelatin-acacia complex coacervation. , 1999, Drug development and industrial pharmacy.

[3]  D. W. Wang,et al.  Electrophoretic ink using urea-formaldehyde microspheres , 2006, Journal of microencapsulation.

[4]  Xiaopeng Zhao,et al.  Preparation of microcapsules with narrow-size distribution by complex coacervation: Effect of sodium dodecyl sulphate concentration and agitation rate , 2008 .

[5]  J P Wang,et al.  The relation between narrow-dispersed microcapsules and surfactants , 2005, Journal of microencapsulation.

[6]  Jun Hee Sung,et al.  Electrophoretic response of poly(methyl methacrylate) coated TiO2 nanoparticles , 2005 .

[7]  Xiaopeng Zhao,et al.  Preparation of microcapsules containing two-phase core materials. , 2004, Langmuir : the ACS journal of surfaces and colloids.

[8]  M. D. Wall,et al.  An investigation of internal phase losses during the microencapsulation of fragrances. , 1992, Journal of microencapsulation.

[9]  D. W. Newton,et al.  Characteristics of medicated and unmedicated microglobules recovered from complex coacervates of gelatin-acacia. , 1977, Journal of pharmaceutical sciences.

[10]  J. H. Lee,et al.  Synthesis and characteristics of microcapsules containing electrophoretic particle suspensions , 2006 .

[11]  Xiaopeng Zhao,et al.  Synthesis of functional microcapsules containing suspensions responsive to electric fields. , 2005, Journal of colloid and interface science.

[12]  Xiaopeng Zhao,et al.  Preparation of a kind of red encapsulated electrophoretic ink , 2004 .

[13]  L. Park,et al.  Fabrication of charged particles for electrophoretic display , 2006 .

[14]  J. Argillier,et al.  Complexation of Cationic Surfactant and Anionic Polymer at the Air−Water Interface , 1996 .