Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Poster: Nanoparticles and Composite Materials
CPP 36.20: Poster
Mittwoch, 16. März 2011, 17:00–19:00, P2
Structural investigation of poly(organosiloxane) nanocapsules with iron oxide cores by (A)SAXS and XRD — •Johannes Möller1, Martin A. Schroer1, Michael Paulus1, Patrick Degen2, D.C. Florian Wieland1, Christoph J. Sahle1, Alexander Nyrow1, Melek Cebi2, Sabine Leick2, Heinz Rehage2, and Metin Tolan1 — 1Fakultät Physik/DELTA, TU Dortmund, Maria-Goeppert-Mayer-Str. 2, D-44227 Dortmund — 2Physikalische Chemie II, TU Dortmund, Otto-Hahn-Str. 6, D-44227 Dortmund
We report the results of (anomalous) small angle X-ray scattering ((A)SAXS) and diffraction (XRD) measurements to study the internal structure and the formation process of poly(organosiloxane) nanocapsules filled with iron oxide cores of different sizes. The synthesis of the nanocapsules has two essential features. First iron oxide nanoparticles are synthesized by a chemical precipitation process. The second step consists of the preparation of a thin poly(organosiloxane) shell around the iron oxide core. The possibility of removing partially or completely the magnetic core of the capsules by chemical etching processes offers the opportunity of assembling hollow nanocapsules, which can be used to produce new types of microreactors or for therapeutic delivery of drugs, genes or radionuclides. The radius distribution functions of the iron oxide cores are determinded by SAXS measurements, showing the dissolution of the cores inside the capsules. Information about the structure of the iron oxide cores and the poly(organosiloxane) network at the surface are revealed by X-ray diffraction.