Colloidal electroconvection in a thin horizontal cell. I. Microscopic cooperative patterns at low voltage

Yilong Han, David G. Grier

    Research output: Contribution to journalArticle

    Abstract

    Applying an electric field to an aqueous colloidal dispersion establishes a complex interplay of forces among the highly mobile simple ions, the more highly charged but less mobile colloidal spheres, and the surrounding water. This interplay can induce a wide variety of visually striking dynamical instabilities even when the applied field is constant. This paper reports on the highly organized patterns that emerge when electrohydrodynamic forces compete with gravity in thin layers of charge-stabilized colloidal spheres subjected to low voltages between parallel-plate electrodes. Depending on the conditions, these spheres can form levitating clusters with morphologies ranging from tumbling clouds to toroidal vortex rings and to writhing labyrinths.

    Original languageEnglish (US)
    Article number164701
    JournalJournal of Chemical Physics
    Volume122
    Issue number16
    DOIs
    StatePublished - Apr 22 2005

    Fingerprint

    low voltage
    Electric potential
    cells
    labyrinth
    Barreling
    Electrohydrodynamics
    electrohydrodynamics
    vortex rings
    parallel plates
    Gravitation
    Vortex flow
    Electric fields
    Ions
    gravitation
    Electrodes
    electrodes
    electric fields
    Water
    water
    ions

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

    Cite this

    Colloidal electroconvection in a thin horizontal cell. I. Microscopic cooperative patterns at low voltage. / Han, Yilong; Grier, David G.

    In: Journal of Chemical Physics, Vol. 122, No. 16, 164701, 22.04.2005.

    Research output: Contribution to journalArticle

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