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Competition between heterogeneous and homogeneous nucleation near a flat wall

Wette, Patrick and Engelbrecht, Andreas and Salh, Roushdey and Klassen, Ina and Menke, Dirk and Herlach, Dieter M. and Roth, Stephan V. and Schöpe, Hans Joachim (2009) Competition between heterogeneous and homogeneous nucleation near a flat wall. Journal of Physics - Condensed Matter (21), 464115-(10 pp). ISSN 0953-8984.

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Abstract

We studied the competition between heterogeneous and homogeneous nucleation of an aqueous suspension of charged colloidal spheres close to the container walls. Samples of equilibrium crystalline structure were shear-melted and the metastable melt left to solidify after the cessation of shear. The crystallization kinetics was monitored using time-resolved scattering techniques: at low particle number densities n we applied an improved static light scattering method while at large particle concentrations ultra-small-angle x-ray scattering was applied for the first time. Our results show some unexpected behavior: the heterogeneous nucleation at the container walls is delayed in comparison to the homogeneous bulk nucleation and its rate density appears surprisingly slightly smaller, demonstrating the complexity of the observed crystallization process.

Document Type:Article
Title:Competition between heterogeneous and homogeneous nucleation near a flat wall
Authors:
AuthorsInstitution or Email of Authors
Wette, PatrickUNSPECIFIED
Engelbrecht, AndreasUNSPECIFIED
Salh, RoushdeyUNSPECIFIED
Klassen, InaUNSPECIFIED
Menke, DirkUNSPECIFIED
Herlach, Dieter M.dieter.herlach@dlr.de
Roth, Stephan V.UNSPECIFIED
Schöpe, Hans JoachimUNSPECIFIED
Date:2009
Journal or Publication Title:Journal of Physics - Condensed Matter
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:464115-(10 pp)
ISSN:0953-8984
Status:Published
Keywords:nucleation
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:26 Nov 2009 08:45
Last Modified:07 Feb 2013 19:27

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