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Seed- and wall-induced heterogeneous nucleation in charged colloidal model systems under microgravity

Wette, Patrick und Schöpe, Hans-Joachim (2011) Seed- and wall-induced heterogeneous nucleation in charged colloidal model systems under microgravity. Physical Review E, 83, 051405-1-051405-8. DOI: 10.1103/PhysRevE.83.051405.

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Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:Seed- and wall-induced heterogeneous nucleation in charged colloidal model systems under microgravity
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Wette, Patrickpatrick.wette@dlr.de
Schöpe, Hans-JoachimUniversität Mainz
Datum:2011
Erschienen in:Physical Review E
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
Band:83
DOI :10.1103/PhysRevE.83.051405
Seitenbereich:051405-1-051405-8
Status:veröffentlicht
Stichwörter:colloids, experiments in reduced gravity, crystallization, heterogeneous nucleation
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W FR - Forschung unter Weltraumbedingungen (alt)
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W FR - Forschung unter Weltraumbedingungen
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Materialforschung unter Mikro-g (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Materialphysik im Weltraum
Hinterlegt von: Dieter Herlach
Hinterlegt am:06 Jun 2011 08:59
Letzte Änderung:16 Feb 2016 05:04

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