Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 41: Nanoparticles and Composite Materials
CPP 41.10: Vortrag
Donnerstag, 3. April 2014, 12:00–12:15, ZEU 222
Resolving the inner structure of nanoparticles by means of solvent contrast variation with SAXS — •Raul Garcia-Diez, Christian Gollwitzer, and Michael Krumrey — Physikalisch-Technische Bundesanstalt, Berlin, Germany
Synthetic latex prepared by multiple-addition emulsion polymerisation present a spherical core-shell structure which can be revealed by Small Angle X-ray Scattering (SAXS) and resolved in conjunction with solvent contrast variation. This method allows the traceable characterization of the size and size distribution of the particles in suspension as well as an insight in its radial structure and an electron density determination, using both the Guinier and Fourier region of the scattering curves along an extended q-range.1 A novell approach to contrast variation based on the anomalous scattering effect of the solvent close to an X-ray absorption edge is presented and compared to the more classical case of latex suspensions in sucrose solutions.
1 N.Dingenouts, J.Bolze, D.Potschke, M.Ballauff; Analysis of polymer latexes by small angle x-ray scattering, Advances in Polymer Science Vol. 144, pp 1-47 (1999)