Colloidal electrostatic interactions near a conducting surface

Marco Polin; David G. Grier; Yilong Han

doi:10.1103/PhysRevE.76.041406

Colloidal electrostatic interactions near a conducting surface

Marco Polin, David G. Grier, Yilong Han

Research output: Contribution to journal › Article › peer-review

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 language	English (US)
Article number	041406
Journal	Physical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume	76
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevE.76.041406
State	Published - Oct 30 2007

ASJC Scopus subject areas

Statistical and Nonlinear Physics
Statistics and Probability
Condensed Matter Physics

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10.1103/PhysRevE.76.041406

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Colloidal electrostatic interactions near a conducting surface

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