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
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Published in:
  • Physical Review Letters. - 2008, vol. 100, p. 178304
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.
Faculté des sciences et de médecine
Département de Physique
  • English
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