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CARBONLETT, vol. 26, no. 1, pp.25-30, 2018

DOI: DOI: http://dx.doi.org/10.5714/CL.2018.26.025

Dispersion stability of polyelectrolyte-wrapped carbon black particles in a highly fluorinated solvent

Hyeon Ji Yoon, Jun Ho Choe, and Hyoung-Joon Jin

Affiliation: WCSL (world Class Smart Lab) of Green Battery Lab., Department of Polymer Science and Engineering, Inha University, 100, Inharo, Nam-gu, Incheon 22212, South Korea

Abstract: The dielectric medium used in electrophoretic displays (EPDs) is required to be an environmentally friendly solvent with high density, low viscosity, and a large electric constant. Hydrofluoroether, a highly fluorinated solvent with eco-friendly characteristics, is regarded as a viable alternative medium for EPDs, owing to the similarity of its physical properties to those of the conventional EPD medium. Surface modification of particles is required, however, in order for it to disperse in the charged solvent. Also, positive/negative charges should be present on the particle surface to enable electrophoretic behavior. In this study, carbon black particles wrapped with positively charged nitrogen (N-CBs) were fabricated by a simple hydrothermal process using a poly(diallyldimethylammonium chloride) solution as a black coloring agent for the EPD. The dispersion behavior of N-CBs was investigated in various solvents.

Keyword: Electrophoretic display; Fluorinated solvent; Carbon black; PDDA; Dispersion