Regensburg 2010 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Poster: Nanoparticles and Composite Materials
CPP 36.3: Poster
Wednesday, March 24, 2010, 17:30–19:00, Poster B2
Alignment of Magnetic Nanoparticles in Diblock Copolymer Films under External Magnetic Fields — •Hyeokmin Choe1, Ezzeldin Metwalli1, Peter Busch2, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department LS E13, James-Franck-Str. 1, 85747 Garching (Germany) — 2Jülich Centre for Neutron Science at FRM II, Forschungszentrum Jülich GmbH, Lichtenbergstr. 1, 85747 Garching (Germany)
Block copolymers with embedded magnetic nanoparticles have attracted strong interest as a method to fabricate hybrid nanocomposites for wide potential applications in functional devices. Furthermore, controlled assembly of copolymers or hybrids to form aligned or patterned structures is an especially hot topic. Recently, controlled alignment of copolymers or hybrids by magnetic fields is emerging in many aspects, because the non-contacting alignment by magnetic fields is easier to handle and safer than that by electric fields. 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. The external magnetic fields are applied to samples during the casting. We have studied both the influence of different concentrations of magnetic nanoparticles as well as external magnetic fields, and the effect of the different field direction, which means the external fields applied by parallel or perpendicular to the substrate. The structure and morphology of films have been characterized with optical microscopy, atomic force microscopy (AFM), and grazing incidence small angle neutron scattering (GISANS).