SAXS and rheometry studies of diglycerol monolaurate reverse micelles in styrene

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  • Shrestha Rekha Goswami
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
  • Shrestha Lok Kumar
    International Center for Young Scientists (ICYS), WPI Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS)
  • Aramaki Kenji
    Graduate School of Environment and Information Sciences, Yokohama National University
  • Abe Masahiko
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science Institute of Colloid and Interface Science, Tokyo University of Science

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  • SAXS and Rheometry Studies of Diglycerol Monolurate Reverse Micelles in Styrene

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We have investigated the structure and rheology of diglycerol monolaurate (C12G2) reverse micelles in styrene using small-angle X-ray scattering (SAXS) and rheometry techniques. The SAXS data have been evaluated by generalized indirect Fourier transformation (GIFT) method and further supported by geometrical model fittings. We found that the C12G2 when added into styrene spontaneously self-assemble into ellipsoidal prolate type reverse micelles under ambient conditions. Micelles grew and micellar aggregation number (Nagg) increased with the increase in surfactant concentration demonstrating concentration induced one dimensional micellar growth, which was further supported by rheology data; the relative viscosity, ηr, for the C12G2/styrene mixtures exhibit far steeper concentration dependence behavior than those predicted for a dispersion of spherical particles based on the Krieger–Dougherty relation, due to the elongated micellar structures. On the other hand, a distinct modulation in the shape and size of micelles favoring ellipsoidal prolate-to-sphere type transition was observed upon heating, whose scheme could be attributed to the enhanced penetration tendency of oil into the lipophilic shell of the surfactant at the higher temperatures. As anticipated reverse micelles swelled with water causing two dimensional micellar growth; both the maximum dimension and maximum core radius increase with water.

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