Density-dependent interactions and structure of charged colloidal dispersions in the weak screening regime

Details Density-dependent interactions and structure of charged colloidal dispersions in the weak screening regime Density-dependent interactions and structure of charged colloidal dispersions in the weak screening regime

2007-06-20

arxiv.org/abs/0706.2956v3

Phys. Rev. Lett. 100, 178304 (2008)

Physics

Condensed Matter

Soft Condensed Matter

Revised version, accepted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.100.178304

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.

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