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Issue 9, 2009
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Like-charge interactions between colloidal particles are asymmetric with respect to sign

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Abstract

Two-dimensional dispersions of colloidal particles with a range of surface chemistries and electrostatic potentials are characterized under a series of solution ionic strengths. A combination of optical imaging techniques are employed to monitor both the colloid structure and the electrostatic surface potential of individual particles in situ. We find that like-charge multiparticle interactions can be tuned from exclusively repulsive to long-range attractive by changing the particle surface composition. This behavior is strongly asymmetric with respect to the sign of the surface potential. Collective long-range attractive interactions are only observed among negatively charged particles.

Graphical abstract: Like-charge interactions between colloidal particles are asymmetric with respect to sign

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Publication details

The article was received on 01 Dec 2008, accepted on 23 Jan 2009 and first published on 20 Mar 2009


Article type: Paper
DOI: 10.1039/B821510C
Citation: Soft Matter, 2009,5, 1931-1936
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    Like-charge interactions between colloidal particles are asymmetric with respect to sign

    E. W. Gomez, N. G. Clack, H. Wu and J. T. Groves, Soft Matter, 2009, 5, 1931
    DOI: 10.1039/B821510C

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