Colloidal Electrostatic Interactions Near a Conducting Surface

Details Colloidal Electrostatic Interactions Near a Conducting Surface Colloidal Electrostatic Interactions Near a Conducting Surface

2006-05-02

arxiv.org/abs/cond-mat/0605058v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 2 figures

Scientific paper

10.1103/PhysRevE.76.041406

Charge-stabilized colloidal spheres dispersed in deionized 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 confinement-induced attractions.

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