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
    Volume76
    Issue number4
    DOIs
    StatePublished - Oct 30 2007

    Fingerprint

    Electrostatics
    Anomalous
    attraction
    electrostatics
    conduction
    Interaction
    Gold
    Microscopy
    Coating
    Charge
    interactions
    Water
    artifacts
    gold
    microscopy
    coatings
    glass
    water
    Glass
    Observation

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Condensed Matter Physics
    • Statistical and Nonlinear Physics
    • Mathematical Physics

    Cite this

    Colloidal electrostatic interactions near a conducting surface. / Polin, Marco; Grier, David G.; Han, Yilong.

    In: Physical Review E, Vol. 76, No. 4, 041406, 30.10.2007.

    Research output: Contribution to journalArticle

    Polin, Marco ; Grier, David G. ; Han, Yilong. / Colloidal electrostatic interactions near a conducting surface. In: Physical Review E. 2007 ; Vol. 76, No. 4.
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