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Comparison of metals and colloids: short-range order in liquid state and crystal nucleation

Herlach, Dieter and Klassen, Ina and Wette, Patrick and Holland-Moritz, Dirk (2010) Comparison of metals and colloids: short-range order in liquid state and crystal nucleation. Building the bridge between physics and materials science in amorphous metals, 12.-16. Oktober 2010, Beijing, V.R China.

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Abstract

Colloids are investigated by Ultra-Small-Angle-X-ray-Scattering (USAXS) with respect to the topological short range order in metastable liquid state. A preference of icosahedral short range order is found quite analogous to the short range order in undercooled melts of pure metals. From the time evolution of the structure factor measured by USAXS during crystallization the homogeneous nucleation rate is determined. From the homogeneous nucleation rate the solid-liquid interfacial energy is inferred. A Turnbull plot of interfacial enery as a function of the difference of chemical potential of solid and liquid of colloidal systems is constructed and compared with early results by Turnbull obtained from undercoling experiments on pure metals and more recent results of MD simulations on pure metals. The dimensionless interfacial energy of colloidal systems is found to be by a factor of 6-7 smaller than the dimensionless interfacial energy of systems of hard matter as metals.

Document Type:Conference or Workshop Item (Speech)
Title:Comparison of metals and colloids: short-range order in liquid state and crystal nucleation
Authors:
AuthorsInstitution or Email of Authors
Herlach, Dieterdieter.herlach@dlr.de
Klassen, Inaina.klassen@dlr.de
Wette, Patrickpatrick.wette@dlr.de
Holland-Moritz, Dirkdirk.holland-moritz@dlr.der
Date:13 October 2010
Status:Published
Keywords:Colloidal suspensions, short-range-order in metastable liquids, crystal nucleation, solid-liqid interfacial energies
Event Title: Building the bridge between physics and materials science in amorphous metals
Event Location:Beijing, V.R China
Event Type:Workshop
Event Dates:12.-16. Oktober 2010
Organizer:Sino-German Center for Research Promotion, Prof. Dr. Wei Hua Wang, Prof. Dr. Konrad Samwer
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:03 Nov 2010 08:50
Last Modified:03 Nov 2010 08:50

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