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Colloidal electrostatic interactions near a conducting surface

Authors Polin, Marco
Grier, David G.
Han, Yilong View this author's profile
Issue Date 2007-10-30
Source Physical Review E , v.76, (4), October 2007
Summary 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.
Rights © 2007 American Physical Society
Language English
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