Seed- and wall-induced heterogeneous nucleation in charged colloidal model systems under microgravity
Wette, Patrick and Schöpe, Hans-Joachim (2011) Seed- and wall-induced heterogeneous nucleation in charged colloidal model systems under microgravity. Physical Review E, 83, . DOI: 10.1103/PhysRevE.83.051405.
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Understanding the process that drives an undercooled fluid to the crystal state is still a challenging issue for condensed matter physics and plays a key role in designing new materials. The crystallization kinetics and the resulting polycrystalline morphology are given by a complex interplay of crystal nucleation, growth, and ripening. A great deal of progress has been made in recent years using colloidal suspensions as model systems in the study of crystallization. Close analogies to atomic systems are observed which can be exploited to address questions not accessible in atomic solidification. Here we present systematic measurements of the crystallization kinetics of a charged colloidal model system adding small amounts of seeds using time resolved scattering techniques. Large seeds show strong sedimentation under gravity even on the time scale of the crystallization process. To avoid this problem we performed our measurements under microgravity during parabolic flights. We report how the seed size and structure affect crystal nucleation and growth as functions of metastability giving the possibility to modify the crystallization process and the resulting microstructure of the polycrystal.
|Title:||Seed- and wall-induced heterogeneous nucleation in charged colloidal model systems under microgravity|
|Journal or Publication Title:||Physical Review E|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Keywords:||colloids, experiments in reduced gravity, crystallization, heterogeneous nucleation|
|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 Materialforschung unter Mikro-g (old)|
|Institutes and Institutions:||Institute of Materials Physics in Space|
|Deposited By:||Dieter Herlach|
|Deposited On:||06 Jun 2011 08:59|
|Last Modified:||07 Feb 2013 20:39|
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