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Phase behaviour of deionized binary mixtures of charged colloidal spheres

Lorenz, Nina J. and Schöpe, Hans Joachim and Reiber, Holger and Palberg, Thomas and Wette , Patrick and Klassen, Ina and Holland-Moritz, Dirk and Herlach, Dieter M. and Okubo, Tsuneo (2009) Phase behaviour of deionized binary mixtures of charged colloidal spheres. Journal of Physics - Condensed Matter (21), p. 464116. ISSN 0953-8984.

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Abstract

We review recent work on the phase behaviour of binary charged sphere mixtures as a function of particle concentration and composition. Both size ratios G and charge ratios L are varied over a wide range. Unlike the case for hard spheres, the long-ranged Coulomb interaction stabilizes the crystal phase at low particle concentrations and shifts the occurrence of amorphous solids to particle concentrations considerably larger than the freezing concentration. Depending on G and L, we observe upper azeotrope, spindle, lower azeotrope and eutectic types of phase diagrams, all known well from metal systems. Most solids are of body centred cubic structure. Occasionally stoichiometric compounds are formed at large particle concentrations. For very low G, entropic effects dominate and induce a fluid–fluid phase separation. Since for charged spheres the charge ratio L is also decisive for the type of phase diagram, future experiments with charge variable silica spheres are suggested.

Document Type:Article
Title:Phase behaviour of deionized binary mixtures of charged colloidal spheres
Authors:
AuthorsInstitution or Email of Authors
Lorenz, Nina J.UNSPECIFIED
Schöpe, Hans JoachimUniversität Mainz
Reiber, HolgerUNSPECIFIED
Palberg, ThomasUniversität Mainz
Wette , PatrickUNSPECIFIED
Klassen, InaUNSPECIFIED
Holland-Moritz, DirkUNSPECIFIED
Herlach, Dieter M.dieter.herlach@dlr.de
Okubo, TsuneoUNSPECIFIED
Date:2009
Journal or Publication Title:Journal of Physics - Condensed Matter
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:p. 464116
ISSN:0953-8984
Status:Published
Keywords:Binary mixtures solloidal spheres
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Ingeborg Parpart
Deposited On:25 Nov 2009 15:07
Last Modified:07 Feb 2013 19:27

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