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    γ-Fe2O3 nanoparticle adsorption at an OTS Langmuir monolayer

    Year: 2010

    Journal: Colloid and Polymer Science (2010), 288(6), 643-651, 20121205

    Authors: Degen, Patrick; Paulus, Michael; Leick, Sabine; Tolan, Metin; Rehage, Heinz

    Organizations: Fakultät Chemie, Physikalische Chemie II, Technische Universität Dortmund, 44227 Dortmund, Germany; Fakultät Physik/DELTA, Technische Universität Dortmund, 44227 Dortmund, Germany

    The assembling of magnetic nanoparticles in ordered structures as well as the preparation of very thin magnetic switchable polymer membranes is an important aim in many technical fields. We studied the influence of γ-Fe2O3 nanoparticles on the polymerization process and on the properties of the poly(organosiloxane)/nanoparticle-composite layer by surface rheological measurements, surface pressure/area (π/A) isotherm measurements, and Brewster angle microscopy. The adsorption process dynamics were studied by X-ray reflectivity and surface potential measurements. The results confirm the presence of attractive electrostatic interactions between the partial negatively charged monolayer and the positively charged nanoparticles. For further investigations, we prepared Langmuir–Blodgett layers of these polymer-nanoparticle composite and investigated them by atomic force microscopy and UV-Vis spectroscopy. We found that the concentration of nanoparticles was very low and the particles were mainly arranged below the polymer layer.