Colloidal electrostatic interactions near a conducting surface

Marco Polin, David G. Grier, Yilong Han

    Research output: Contribution to journalArticle

    Abstract

    Like-charged colloidal spheres dispersed in de-ionized water are supposed to repel each other. Instead, artifact-corrected video microscopy measurements reveal an anomalous long-ranged like-charge attraction in the interparticle pair potential when the spheres are confined to a layer by even a single-charged glass surface. These attractions can be masked by electrostatic repulsions at low ionic strengths. Coating the bounding surfaces with a conducting gold layer suppresses the attraction. These observations suggest a possible mechanism for the anomalous confinement-induced attractions.

    Original languageEnglish (US)
    Article number041406
    JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
    Volume76
    Issue number4
    DOIs
    StatePublished - Oct 30 2007

    ASJC Scopus subject areas

    • Statistical and Nonlinear Physics
    • Statistics and Probability
    • Condensed Matter Physics

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