Phys. Rev. E 76, 041406 (2007) [7 pages]Colloidal electrostatic interactions near a conducting surfaceReceived 2 May 2006; revised 19 July 2007; published 30 October 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevE.76.041406
DOI:
10.1103/PhysRevE.76.041406
PACS:
82.70.Dd, 05.40.−a, 61.20.−p
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