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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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
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 10592
- DOI 10.1103/PhysRevLett.100.178304
- Persistent URL
- https://folia.unifr.ch/unifr/documents/300834
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