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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. American Institute of Physics (AIP). DOI: 10.1063/1.3380823



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.

Item URL in elib:https://elib.dlr.de/63875/
Document Type:Article
Title:Communications: Complete description of re-entrant phase behavior in a charge variable colloidal model system
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wette, Patrickpatrick.wette (at) dlr.deUNSPECIFIED
Klassen, Inaina.klassen (at) dlr.deUNSPECIFIED
Holland-Moritz, Dirkdirk.holland-moritz (at) dlr.deUNSPECIFIED
Herlach, Dieterdieter.herlach (at) dlr.deUNSPECIFIED
Schöpe, Hans JoachimJohannes Gutenberg Universität MainzUNSPECIFIED
Lorenz, NinaJohannes Gutenberg Universität MainzUNSPECIFIED
Reiber, HolgerJohannes Gutenberg Universität MainzUNSPECIFIED
Palberg, ThomasJohannes Gutenberg Universität MainzUNSPECIFIED
Date:6 April 2010
Journal or Publication Title:Journal of Chemical Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1063/1.3380823
Page Range:131302-1-131302-4
Publisher:American Institute of Physics (AIP)
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: Herlach, Dieter
Deposited On:12 Apr 2010 09:37
Last Modified:31 Jul 2019 19:27

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