Physics – Condensed Matter – Statistical Mechanics
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..519...87t&link_type=abstract
STATISTICAL PHYSICS: Third Tohwa University International Conference. AIP Conference Proceedings, Volume 519, pp. 87-98 (2000).
Physics
Condensed Matter
Statistical Mechanics
1
Particle Dynamics, Order-Disorder Transformations, Statistical Mechanics Of Model Systems
Scientific paper
The Derjaguin-Landue-Vervey-Overbeek (DLVO) theory predicts that an isolated pair of charged colloidal spheres experience purely repulsive screened Coulomb interaction at large interparticle separations. Many evidences, which suggest the existence of long-range attractive component in the interparticle interaction, have emerged contradicting the prediction. These evidences include gas-liquid, gas-solid transitions, existence of stable voids, metastable colloidal crystallites and reentrant transitions in dilute suspensions. Some of these observations have triggered several experimental and theoretical investigations to probe the pair-potential U(r) between like-charged in very dilute suspensions. Existence of long-range attraction in U(r) has been observed only when like-charged glass walls confine like-charged particles. Though some theoretical models predicted the existence of long-range attraction in the effective pair-potential, a clear and consensus picture is still awaited. This paper briefly reviews the experiments and theoretical results that have dealt with long-range attraction in colloidal systems. The paper presents in detail the recent studies of structural ordering in a novel two dimensional (2D) system of like-charged large metal balls. Interestingly, these studies reveal the existence of long-range attraction in the pair-interaction of like-charged metal balls spread on a dielectric surface, and the occurrence of gas-liquid transition upon variation of the area fraction of the charged metal balls. .
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