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

Rojas-Ochoa, Luis Fernando; Castañeda-Priego, R.; Lobaskin, V.; Stradner, Anna; Scheffold, Frank; Schurtenberger, Peter

doi:10.1103/PhysRevLett.100.178304

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Journal article

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

Rojas-Ochoa, Luis Fernando Departamento de Física, Cinvestav-IPN, Av. Instituto Politécnico Nacional, México D. F., Mexico - Physics Department, University of Fribourg, Switzerland
Castañeda-Priego, R. Instituto de Física, Universidad de Guanajuato, León, Mexico
Lobaskin, V. Physik-Department, Technische Universität München, Garching, Germany
Stradner, Anna Physics Department, University of Fribourg, Switzerland
Scheffold, Frank Physics Department, University of Fribourg, Switzerland
Schurtenberger, Peter Physics Department, University of Fribourg, Switzerland

02.05.2008

Published in:

Physical Review Letters. - 2008, vol. 100, p. 178304

Colloids

Neutron scattering (condensed matter structure determination)

Theory and models of liquid structure

English 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 nonmonotonic 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.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language