Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Nanoparticles and Composite Materials
CPP 8.2: Poster
Montag, 26. März 2012, 17:30–20:00, Poster A
Maghemite nanoparticles in thin block copolymer films — •Yuan Yao1, Ezzeldin Metwalli1, Volker Körstgens1, Eva Herzig1, Weijia Wang1, Adeline Buffet2, Stephan V. Roth2, Matthias Opel3, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching, Germany — 2HASYLAB at DESY, Notkestr. 85, 22603 Hamburg, Germany — 3Walther-Meißner-Institut, Walther-Meissner-Str. 8, 85748 Garching, Germany
Maghemite nanoparticles embedded inside a polymer matrix mark a new class of hybrid materials which have attracted high interest. The control of the alignment of the maghemite nanoparticles within the polymer matrix is essential for producing well-aligned highly-oriented metal-polymer nanocomposites. The alignment of maghemite nanoparticles in poly(styrene-b-methyl methacrylate) diblock copolymer films is investigated. Two different sizes of maghemite nanoparticles are used: One is below and the other one above the critical particle size of the single magnetic domain. Films are prepared by solution casting within an external magnetic field. The morphology and inner nano-structure of the resulting hybrid films is studied as a function of the external magnetic field strength and for different concentrations of maghemite nanoparticles. The structure characterization of the films is based on optical microscopy, atomic force microscopy, and grazing incidence small-angle x-ray scattering. In addition, the magnetic properties are measured for different temperatures and compared with theoretical predictions.