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Homogeneous versus heterogeneous nucleation in metals and colloids

Herlach, Dieter and Klassen, Ina and Wette, Patrick and Schöpe, Hans Joachim (2010) Homogeneous versus heterogeneous nucleation in metals and colloids. TMS. TMS2010 Annual Meeting, 14.-20. Februar 2010, Seattle, USA.

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Official URL: http://www.materialstechnology.org

Abstract

The competition between heterogeneous and homogeneous nucleation of a charged colloidal suspension is studied close to container walls. Colloidal crystals were shear melted and a metastable melt left to solidify afterwards. The crystallization kinetics was monitored using time resolved Ultra Small Angle X-ray Scattering (USAXS) at different degrees of metastability. At high metastability the homogeneous nucleation dominates the solidification scenario leading to a small amount of oriented wall based crystals. At lower metastability the homogeneous nucleated crystals do crystallize first while the crystallization of the wall crystal is delayed. When the amount of solid crystallized near the wall shows its fasted increase the amount of polycrystalline crystal decreases indicating that the randomly oriented polycrystal is converted into a wall crystal finally resulting in a large amount of oriented wall based material. Our experiments demonstrate the complexity of the crystallization process of colloidal suspension close to container walls.

Document Type:Conference or Workshop Item (Speech)
Title:Homogeneous versus heterogeneous nucleation in metals and colloids
Authors:
AuthorsInstitution or Email of Authors
Herlach, Dieterdieter.herlach@dlr.de
Klassen, InaUNSPECIFIED
Wette, PatrickUNSPECIFIED
Schöpe, Hans JoachimUniversität Mainz
Date:16 February 2010
Page Range:p. 153
Publisher:TMS
Series Name:139th Annual Meeting & Exhibition
Status:Published
Keywords:phase transformations
Event Title:TMS2010 Annual Meeting
Event Location:Seattle, USA
Event Type:international Conference
Event Dates:14.-20. Februar 2010
Organizer:The Minerals, Metals & Materials Society
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:25 Feb 2010 13:41
Last Modified:25 Feb 2010 13:41

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