Colloidal electroconvection in a thin horizontal cell. III. Interfacial and transient patterns on electrodes

Yilong Han, David G. Grier

    Research output: Contribution to journalArticle

    Abstract

    Previously we have reported a family of convective patterns formed by charge-stabilized aqueous colloidal suspensions under constant (dc) vertical electric fields [Y. Han and D. G. Grier, J. Chem. Phys. 122, 164701 (2005)10.1063/1.1884599; Y. Han and D. G. Grier, J. Chem. Phys. 125, 144707 (2006)10.1063/1.2349486]. These patterns form in the bulk when electrokinetic forces act in the opposite direction to gravity. Here, we report on cellular patterns that silica colloidal spheres form on a horizontal electrode when electrokinetic forces act in the same direction as gravity. We suggest that these cellular patterns form as a result of bulk electroconvection mediated by charge injection into the supporting aqueous electrolyte. This charge-injection mechanism also accounts for some aspects of electroconvective pattern formation in our earlier reports. Cellular patterns reorganize themselves into distinct transient patterns after the driving voltage is turned off. These transients cast new light on the complex interplay between the motions of charged colloidal spheres and the ionic relaxation of water undergoing electrolysis.

    Original languageEnglish (US)
    Article number014504
    JournalJournal of Chemical Physics
    Volume137
    Issue number1
    DOIs
    StatePublished - Jul 7 2012

    ASJC Scopus subject areas

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

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