Anomalous interactions in confined charge-stabilized colloid

Details Anomalous interactions in confined charge-stabilized colloid Anomalous interactions in confined charge-stabilized colloid

2004-04-13

arxiv.org/abs/cond-mat/0404284v1

Physics

Condensed Matter

Soft Condensed Matter

8 pages, 5 figures, RevTeX4. Conference proceedings for CODEF-04, Colloidal Dispersions in External Fields, March 29 - April 1

Scientific paper

10.1088/0953-8984/16/38/028

Charge-stabilized colloidal spheres dispersed in weak 1:1 electrolytes are supposed to repel each other. Consequently, experimental evidence for anomalous long-ranged like-charged attractions induced by geometric confinement inspired a burst of activity. This has largely subsided because of nagging doubts regarding the experiments' reliability and interpretation. We describe a new class of thermodynamically self-consistent colloidal interaction measurements that confirm the appearance of pairwise attractions among colloidal spheres confined by one or two bounding walls. In addition to supporting previous claims for this as-yet unexplained effect, these measurements also cast new light on its mechanism.

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