Dispersion of Graphene in an Aqueous Solution with Poly(sodium 4-styrenesulfonate) Monitored by Capillary Electrophoresis

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  • TAKAYANAGI Toshio
    Graduate School of Technology, Industrial and Social Sciences, Tokushima University
  • MIZUTA Yuto
    Faculty of Engineering, Tokushima University
  • BECCHAKU Yuta
    Graduate School of Advanced Technology and Science, Tokushima University
  • MIZUGUCHI Hitoshi
    Graduate School of Technology, Industrial and Social Sciences, Tokushima University

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<p>Graphene was dispersed in an aqueous solution with poly(sodium 4-styrenesulfonate) as a dispersant. The charge of the graphene came to be apparently negative by the adsorption of poly(4-styrenesulfonate) ion (PSS). Two kinds of PSS were examined: the average molecular masses of 70,000 and 1,000,000 (PSS 70,000 and PSS 1,000,000, respectively). Capillary electrophoresis was used to evaluate the dispersion of the apparently anionic graphene in an aqueous solution. A broad signal corresponding to the dispersed graphene was detected in the electropherograms. The effective electrophoretic mobility of the dispersed graphene was somewhat larger at higher concentrations of PSS 70,000, suggesting that the adsorbed amount of PSS 70,000 increased. Even when the separation buffer did not contain PSS, the broad signal of the anionic graphene was still detected. The peak height and/or the peak area, as well as the effective electrophoretic mobility of the graphene decreased little at the reduced applied voltages, i.e., at longer separation/detection time. Therefore, the adsorption of PSS is irreversible or the desorption of PSS from the graphene surface is very slow. Accordingly, the dispersed graphene with PSS would be separated from the matrix PSS by the electrophoretic separation.</p>

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  • CHROMATOGRAPHY

    CHROMATOGRAPHY 40 (3), 121-126, 2019-10-20

    クロマトグラフィー科学会

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