Like-charge interactions between colloidal particles are asymmetric with respect to sign.

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Soft Matter. 2009;:1931-6
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Like-charge interactions between colloidal particles are asymmetric with respect to sign.
Clack NG, Salaita K, Wu H, Groves J, Gomez E
Note: Research in this publication was not performed at Janelia.
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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.

PMID: 25221611 [PubMed - indexed for MEDLINE]

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Janelia Authors

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