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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 54: Poster Session 3

CPP 54.68: Poster

Donnerstag, 3. April 2014, 15:00–19:00, P2

maghemite nanoparticles embedded in thin block copolymer films — •yuan yao¹, ezzeldin metwalli¹, bo su¹, volker körstgens¹, daniel mosegui gonzalez¹, lin song¹, gonzalo santoro², stephan v. roth², matthias opel³, and peter müller-buschbaum¹ — ¹TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching — ²DESY, Notkestrasse, 85, 22603 Hamburg — ³Walther-Meissner-Institute, Walther-Meissner-Straße. 8, 85747 Garching

Maghemite nanoparticles embedded inside a polymer matrix mark a novel class of hybrid materials which have attracted high interest due to the potential for numerous applications such as sensors and high density magnetic storage devices. The control of the alignment of the maghemite nanoparticles within the polymer matrix is essential for producing well-aligned highly-oriented metal oxide-polymer nanocomposites. The alignment of maghemite nanoparticles in polystyrene-b-poly(N-isopropylacrylamide) P(S-b-NIPAM) diblock copolymer films is investigated. The thin hybrid films are prepared by spin coating. The structure of the resulting hybrid films is studied at different concentrations of maghemite nanoparticles using SEM, AFM, GISAXS and GIWAXS. The results indicate a morphological transition from lamella to hexagonal upon incorporation of maghemite nanoparticles into the diblock copolymer films. At high concentration of nanoparticles, large particles aggregates are formed on top of the polymer surface. The magnetic properties of the nanocomposite films at different temperatures are measured and compared with theoretical predictions.