Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 13: Colloidal and Nanoparticles
CPP 13.2: Vortrag
Dienstag, 26. Februar 2008, 15:15–15:30, C 264
Fabrication of novel metal oxide hollow spheres with tailored shell thickness — •Mukesh Agrawal1, Andrij Pich2, Nikolaos E. Zafeiropoulos1, and Manfred Stamm1 — 1Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Strasse 6, 01069 Dresden, Germany — 2Technische Universität Dresden, Institut für Makromolekulare Chemie und Textilchemie, Mommsenstr. 4, 01062 Dresden, Germany
Sub-micrometer sized polystyrene-metal oxide core-shell composite particles and hollow metal oxide spheres with tunable shell thickness and void size have been fabricated exploiting the sol-gel process. A controlled precipitation of ZnO/TiO2/Ta2O5 nanoparticles has been carried out on the template surface by hydrolyzing the metal oxide precursors and subsequently polymer core was removed either via chemical treatment with toluene or calcination at elevated temperature to achieve the hollow spheres. Thickness of the ZnO/TiO2/Ta2O5 shell, precipitated on polystyrene core during coating process has been tuned by varying the concentration of metal oxide precursors in reaction media. The obtained core-shell composite particles and hollow microspheres have been characterized by scanning electron microscopy, transmission electron microscopy, infra-red spectroscopy, X-ray diffraction and thermo gravimetric analysis. Due to the unique optical and dielectric properties, these nanostructured materials are envisaged to be used in applications such as novel building blocks for the fabrication of advanced materials, surface coatings, catalysts and drug delivery systems.