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Communications: Complete description of re-entrant phase behavior in a charge variable colloidal model system

Wette, Patrick and Klassen, Ina and Holland-Moritz, Dirk and Herlach, Dieter and Schöpe, Hans Joachim and Lorenz, Nina and Reiber, Holger and Palberg, Thomas and Roth, Stephan (2010) Communications: Complete description of re-entrant phase behavior in a charge variable colloidal model system. Journal of Chemical Physics, 132, 131302-1-131302-4. DOI: 10.1063/1.3380823.

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Abstract

In titration experiments with NaOH, we have determined the full phase diagram of charged colloidal spheres in dependence on the particle density n, the particle effective charge Zeff and the concentration of screening electrolyte c using microscopy, light and ultrasmall angle x-ray scattering (USAXS). For sufficiently large n, the system crystallizes upon increasing Zeff at constant c and melts upon increasing c at only slightly altered Zeff. In contrast to earlier work, equilibrium phase boundaries are consistent with a universal melting line prediction from computer simulation, if the elasticity effective charge is used. This charge accounts for both counterion condensation and many-body effects.

Document Type:Article
Title:Communications: Complete description of re-entrant phase behavior in a charge variable colloidal model system
Authors:
AuthorsInstitution or Email of Authors
Wette, Patrickpatrick.wette@dlr.de
Klassen, Inaina.klassen@dlr.de
Holland-Moritz, Dirkdirk.holland-moritz@dlr.de
Herlach, Dieterdieter.herlach@dlr.de
Schöpe, Hans JoachimJohannes Gutenberg Universität Mainz
Lorenz, NinaJohannes Gutenberg Universität Mainz
Reiber, HolgerJohannes Gutenberg Universität Mainz
Palberg, ThomasJohannes Gutenberg Universität Mainz
Roth, StephanHASYLAB, DESY Hamburg
Date:6 April 2010
Journal or Publication Title:Journal of Chemical Physics
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:132
DOI:10.1063/1.3380823
Page Range:131302-1-131302-4
Status:Published
Keywords:Colloids, phase diagramme, USAXS
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: Dieter Herlach
Deposited On:12 Apr 2010 09:37
Last Modified:12 Dec 2013 20:56

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