Density-dependent interactions and structure of charged colloidal dispersions in the weak screening regime
Soft Condensed Matter
2008-05-08 v3
Abstract
We determine the structure of charge-stabilized colloidal suspensions at low ionic strength over an extended range of particle volume fractions using a combination of light and small angle neutron scattering experiments. The variation of the structure factor with concentration is analyzed within a one-component model of a colloidal suspension. We show that the observed structural behavior corresponds to a non-monotonic density dependence of the colloid effective charge and the mean interparticle interaction energy. Our findings are corroborated by similar observations from primitive model computer simulations of salt-free colloidal suspensions.
Keywords
Cite
@article{arxiv.0706.2956,
title = {Density-dependent interactions and structure of charged colloidal dispersions in the weak screening regime},
author = {Luis F. Rojas-Ochoa and Ramon Castaneda-Priego and Vladimir Lobaskin and Anna Stradner and Frank Scheffold and Peter Schurtenberger},
journal= {arXiv preprint arXiv:0706.2956},
year = {2008}
}
Comments
Revised version, accepted to Phys. Rev. Lett