Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 4: Nanoparticles, Nanocrystals and Composites I
CPP 4.2: Vortrag
Montag, 7. März 2016, 09:45–10:00, H41
Assembly of metal-oxide nanoparticles directed by nano-domain orientation in block copolymer thin films — •Ezzeldin Metwalli1, Yuan Yao1, Jean-Francois Moulin2, Matthias Opel3, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching, Germany — 2Helmholtz Zentrum Geesthacht, Institut für Werkstoffforschung, MLZ, 85748 Garching, Germany — 3Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
Both, parallel and perforated lamella morphologies of hybrid thin films [1-2] composed of maghemite nanoparticles (NPs) and PSd-b-PBMA diblock copolymer (DBC) were investigated. A systematic identification of NP arrangements within the nanostructured DBC films was obtained at different film depths using TOF-GISANS. An enrichment of NPs at the solid interface for both morphologies was observed. The dispersion stability of the PS-coated NPs in the nanostructured DBC films depends not only on the NP size but also on the orientation of the PS nanodomains. The laterally 2D confined PS domains in the perforated lamella initiate an aggregation of NPs at a lower NP concentration compared with 1D parallel lamella morphology. The potential applications in relation to medical instrumentation and magnetic sensors are highly feasible for both morphologies based on the superparamagnetic behavior of the fabricated nanocomposite films, proven with a superconducting quantum interference device magnetometer. [1] Metwalli et al., ChemPhysChem 15, 2236 (2014) [2] Y. Yao et al., ACS Appl. Mater. Interfaces 7, 13080 (2015)