Microencapsulated electric ink using gelatin/gum arabic

Authors: Wang, D. W.; Zhao, X. P.

Source: Journal of Microencapsulation, Volume 26, Number 1, February 2009 , pp. 37-45(9)

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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.

Keywords: Electric ink; microcapsules; complex coacervation; electrophoresis display

Document Type: Research article

DOI: http://dx.doi.org/10.1080/02652040802127806

Affiliations: 1: Department of Applied Physics, Institute of Electrorheological Technology, Xi'an, PR, China

Publication date: 2009-02-01

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