Charge renormalization in nominally apolar colloidal dispersions

Daniel J. Evans, Andrew D. Hollingsworth, David G. Grier

    Research output: Contribution to journalArticle

    Abstract

    We present high-resolution measurements of the pair interactions between dielectric spheres dispersed in a fluid medium with a low dielectric constant. Despite the absence of charge control agents or added organic salts, these measurements reveal strong and long-ranged repulsions consistent with substantial charges on the particles whose interactions are screened by trace concentrations of mobile ions in solution. The dependence of the estimated charge on the particles' radii is consistent with charge renormalization theory and, thus, offers insights into the charging mechanism in this interesting class of model systems. The measurement technique, based on optical-tweezer manipulation and artifact-free particle tracking, makes use of optimal statistical methods to reduce measurement errors to the femtonewton frontier while covering an extremely wide range of interaction energies.

    Original languageEnglish (US)
    Article number042612
    JournalPhysical Review E
    Volume93
    Issue number4
    DOIs
    StatePublished - Apr 25 2016

    Fingerprint

    Renormalization
    Charge
    Interaction
    Optical Tweezers
    Particle Tracking
    Dielectric Constant
    Measurement Techniques
    particle interactions
    Measurement Error
    Salt
    Statistical method
    charging
    artifacts
    Manipulation
    manipulators
    coverings
    Covering
    High Resolution
    Radius
    Trace

    ASJC Scopus subject areas

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

    Cite this

    Charge renormalization in nominally apolar colloidal dispersions. / Evans, Daniel J.; Hollingsworth, Andrew D.; Grier, David G.

    In: Physical Review E, Vol. 93, No. 4, 042612, 25.04.2016.

    Research output: Contribution to journalArticle

    Evans, Daniel J. ; Hollingsworth, Andrew D. ; Grier, David G. / Charge renormalization in nominally apolar colloidal dispersions. In: Physical Review E. 2016 ; Vol. 93, No. 4.
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