Berlin 2005 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 14: Polymer physics at the surface
CPP 14.5: Vortrag
Montag, 7. März 2005, 17:30–17:45, TU C130
AFM studies on nanostructure of sol-gel materials doped with photosensitive compounds — •Halina Podbielska1,2, Marta Kopaczynska3, Agnieszka Ulatowska-Jarza1,4, and HansJ. Eichler2,4 — 1Bio-Optics Group, Institute of Physics, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, PL-50370 Wroclaw, Poland — 2Institute of Optics, Technical University Berlin, Strasse des 17 Juni 135, D-10623 Berlin, Germany — 3Institut für Chemie - Organische Chemie Freie Universität Berlin, Takustr. 3, 14195 Berlin — 4Laser-und Medizin-Technologie Berlin, Fabeckstr. 60-62, D-14195 Berlin, Germany
Silica sol-gels are porous bodies made from liquids. It is possible to entrap various compounds in the porous sol-gel network. The aim of this work is to examine the structural properties of sol-gel matrices doped with photosensitive dyes. Our idea is to construct a special light applicator which can act simultaneously as carrier for photosensitive dye for PDT. Two photosensitizers were examined: natural porphyrine Protoporhyrine IX and chlorophyll based Photolon. The sol-gel films were prepared from silicate precursor TEOS mixed with ethanol in acid catalyzed hydrolysis,with different ratios R (20, 32, 40) denoting the number of alcohol moles to to the number of TEOS moles. Pure and doped films were studied by means of AFM. It was stated that nanostructure of sol-gels depends on R ratio. It was proved that there are open pores enabling the contact of photosesnitizers with external environment and the immobilization in sol-gels do not alter the structure of photosensitive dyes.