Density dependent interactions and structure of charged colloidal dispersions in the weak screening regime
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Rojas-Ochoa, Luis Fernando
Departamento de Física, Cinvestav-IPN, Av. Instituto Politécnico Nacional, México D. F., Mexico - Physics Department, University of Fribourg, Switzerland
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Castañeda-Priego, R.
Instituto de Física, Universidad de Guanajuato, León, Mexico
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Lobaskin, V.
Physik-Department, Technische Universität München, Garching, Germany
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Stradner, Anna
Physics Department, University of Fribourg, Switzerland
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Scheffold, Frank
Physics Department, University of Fribourg, Switzerland
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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.
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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Physique
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Language
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Classification
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Physics
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/300834
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