Dresden 2014 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 65: Topical session: X-ray and neutron scattering in materials science VI - Which orientations can we expect for elongated particles in self-confined systems?
MM 65.2: Vortrag
Freitag, 4. April 2014, 12:15–12:30, BAR 205
In-situ Synchrotron Studies of Colloidal Crystallisation and the Influence of the Nanocrystal Shape — •Rainer T. Lechner1, Max Burian1, Christian Prehal1, Maksym Yarema2,3, Heinz Amenitsch4, Wolfgang Heiss2, and Oskar Paris1 — 1Institute of Physics, Montanuniversiaet Leoben, 8700 Leoben, Austria — 2Institute of Semiconductor and Solid State Physics, JKU Linz, 4040 Linz, Austria — 3Integrated Systems Laboratory, ETH Zürich J87, 8092 Zurich, Switzerland — 4Institute of Inorganic Chemistry, TU Graz, 8010 Graz, Austria
Colloidal crystals using crystalline nanoparticles (NCs) as building blocks offer the opportunity for designing artificial solids [1] with tailored properties [2] used e.g. for nanoelectrodes [3]. The assembly of colloidal crystals is not only influenced the by the NC-size, but also by the shape of the individual NC.
We studied by in-situ SAXS/WAXS the template free self-assembled colloidal crystallization by diffusion of a non-solvent into the colloidal dispersion [1]. The SAXS patterns of the NC ensembles were recorded below the NC-solvent/non-solvent interface at the SAXS beamline at ELETTRA. Hence, we can follow the crystallization process in short time steps as a function of the non-solvent concentration. Furthermore, we retrieved the mean particle shape of the NCs and could show the influence of the elliptical and facetted shape on the super-crystal structure.
[1] M. Yarema, et al., ACS Nano 6, (2012) [2] D.V. Talapin, MRS Bull. 37, (2012) [3] M.Yarema, et al., JACS 132, (2010)