Density-dependent interactions and structure of charged colloidal dispersions in the weak screening regime
arXiv:0706.2956 · doi:10.1103/PhysRevLett.100.178304
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.
Revised version, accepted to Phys. Rev. Lett
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