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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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.
|Title:||Phase behaviour of deionized binary mixtures of charged colloidal spheres|
|Journal or Publication Title:||Journal of Physics - Condensed Matter|
|In ISI Web of Science:||Yes|
|Page Range:||p. 464116|
|Keywords:||Binary mixtures solloidal spheres|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research area:||Space|
|DLR - Program:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research theme (Project):||W - Vorhaben Materialwissenschaftliche Forschung (old)|
|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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