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 | |
| State | Published - Oct 30 2007 |
ASJC Scopus subject areas
- Statistical and Nonlinear Physics
- Statistics and Probability
- Condensed Matter Physics
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Cite this
Polin, M., Grier, D. G., & Han, Y. (2007). Colloidal electrostatic interactions near a conducting surface. Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 76(4), [041406]. https://doi.org/10.1103/PhysRevE.76.041406