The shear hysteresis in lamellar structure of surfactant-water binary system

Takenobu Nakamura, Wataru Shinoda, Masuhiro Mikami

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    We study the shear effect on the lamellar structure of surfactants in water using dissipative particle dynamics simulations. Starting from a lamellar structure without shear flow, we increase the shear rate and then decrease it stepwisely. A weak shear changes the lamellar plane to be parallel to the shear direction though the lamellar normal has no specific direction on the plane normal to the shear direction. By increasing the shear rate, the lamellar normal eventually flips to the vorticity direction regardless of the initial configuration. Lamellar normal would stay along the vorticity direction on decreasing the shear rate. The hysteresis is also found in shear-stress. By varying the shear rate, the time needed to reach the final unique state is significantly shortened compared with that observed with a constant shear rate. We find a correlation between the excess shear-stress and the tilt angle of surfactant in lamellar.

    Original languageEnglish
    Pages (from-to)20-26
    Number of pages7
    JournalChemical Physics
    Volume367
    Issue number1
    DOIs
    Publication statusPublished - 2010 Jan 18

    Keywords

    • Dissipative particle dynamics
    • Hysteresis
    • Lamellar
    • Shear

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Physical and Theoretical Chemistry

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