Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Poster: Nanoparticles and Composite Materials
CPP 36.9: Poster
Mittwoch, 16. März 2011, 17:00–19:00, P2
Effect of external magnetic field on the alignment of metal-polymer nanocomposites — •Yuan Yao1, Ezzeldin Metwalli1, Heokmin Choe1, Peter Busch2, and Peter Müller-Buschbaum1 — 1TU München, Physik Department, LS Funkt. Mat., James-Franck-Str. 1, 85748 Garching, Germany — 2Jülich Centre for Neutron Science at FRM II, Forschungszentrum Jülich GmbH, Lichtenberstr. 1, 85747 Garching
Block copolymers embedded with magnetic nanoparticles have attracted strong interest as a method to fabricate hybrid nanocomposites for wide potential applications in functional devices. Furthermore, the control over the alignment of the nanoparticles within the polymer matrix is essential for producing well-aligned highly-oriented metal-polymer nanopatterns. Controlled alignment of block copolymers or metal-polymer composites was achieved via various methods. In this work, we have investigated the alignment of magnetic nanoparticles, which is maghemite, in poly(styrene-b-methylmethacrylate) diblock copolymer films. Films are prepared by solution casting. An external magnetic field is applied to the samples during the casting step. We have studied the emerged morphologies under the influence of both nanoparticle concentrations in the polymer film and the external magnetic field strength at different direction relative to the sample surface. The structures of the metal-polymer composite films have been characterized using optical microscopy, atomic force microscopy (AFM), and grazing incidence small angle neutron scattering (GISANS).