Long-range attraction in systems of like-charged particles

Tata, B. V. R.
June 2000
AIP Conference Proceedings;2000, Vol. 519 Issue 1, p87
Academic Journal
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 longrange 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 longrange 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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