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), . ISSN 0953-8984.
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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.
|Title:||Competition between heterogeneous and homogeneous nucleation near a flat wall|
|Journal or Publication Title:||Journal of Physics - Condensed Matter|
|In ISI Web of Science:||Yes|
|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:||26 Nov 2009 08:45|
|Last Modified:||07 Feb 2013 19:27|
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