This title appears in the Scientific Report :
2003
Please use the identifier:
http://dx.doi.org/10.1209/epl/i2003-00142-5 in citations.
Please use the identifier: http://hdl.handle.net/2128/22936 in citations.
Effect of many-body interactions on the solid-liquid phase behavior of charge-stabilized colloidal suspensions
Effect of many-body interactions on the solid-liquid phase behavior of charge-stabilized colloidal suspensions
The solid-liquid phase diagram of charge-stabilized colloidal suspensions has been calculated using a technique that combines a continuous Poisson-Boltzmann description for the microscopic electrolyte ions with a molecular-dynamics simulation for the macroionic colloidal spheres. While correlations...
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Personal Name(s): | Dobnikar, J. |
---|---|
Rzehak, R. / Grünberg, H.-H. | |
Contributing Institute: |
Theorie III; IFF-TH-III |
Published in: | epl, 61 (2003) S. 695 |
Imprint: |
Les Ulis
EDP Sciences
2003
|
Physical Description: |
695 |
DOI: |
10.1209/epl/i2003-00142-5 |
Document Type: |
Journal Article |
Research Program: |
Kondensierte Materie |
Series Title: |
Europhysics Letters
61 |
Subject (ZB): | |
Link: |
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Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/22936 in citations.
The solid-liquid phase diagram of charge-stabilized colloidal suspensions has been calculated using a technique that combines a continuous Poisson-Boltzmann description for the microscopic electrolyte ions with a molecular-dynamics simulation for the macroionic colloidal spheres. While correlations between the microions are neglected in this approach, many-body interactions between the colloids, mediated by the screening ionic fluid between them, are fully included. The Lindemann criterion has been used to determine the solid-to-liquid transition temperature in a colloidal system at a relatively high colloid volume fraction where many-body interactions are expected to be strong. With a view to the Derjaguin-Landau-Verwey-Overbeek theory predicting that colloids interact via Yukawa pair potentials, we compare our results with the phase diagram of a simple Yukawa liquid. We find an agreement under high-salt conditions, but considerable differences at low ionic strength. Using effective force calculations and data from molecular-dynamics simulations with simple model potentials, we further demonstrate that these differences are due to many-body interactions. |