Journal Article

PreJuSER-30224

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Effect of many-body interactions on the solid-liquid phase behavior of charge-stabilized colloidal suspensions

Dobnikar, J. ; Rzehak, R.FZJ* ; Grünberg, H.-H.

2003
EDP Sciences Les Ulis

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Please use a persistent id in citations: http://hdl.handle.net/2128/22936  doi:10.1209/epl/i2003-00142-5

Abstract: 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.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Theorie III (IFF-TH-III)

Research Program(s):

1. Kondensierte Materie (M02)

Appears in the scientific report 2003

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Database coverage:
; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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