Colloidal Electrostatic Interactions Near a Conducting Surface

Abstract

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.

4 pages, 2 figures

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• Slow sedimentation and deformability of charged lipid vesicles
• Surface-charge-induced freezing of colloidal suspensions
• Tracking of colloids close to contact
• Interactions between colloids induced by a soft cross-linked polymer substrate
• A New Tracking Algorithm for Multiple Colloidal Particles Close to Contact
• Structure and dynamics of a layer of sedimented Brownian particles
• Surface Charge Relaxation Controls the Lifetime of Out-of-Equilibrium Colloidal Crystals
• Biases in particle localization algorithms
• Collapse of Point Vortex Dipoles in a Bounded Fluid Layer and the Hydrodynamic Mechanism of Mutual Attraction of Like-Charged Micro-Particles in the Colloid or Dusty Plasma Systems