Regensburg 2007 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 19: POSTER: Micro and Nano Fluidics
CPP 19.3: Poster
Wednesday, March 28, 2007, 16:00–18:30, Poster B
Raman spectroscopy on periodic mesoporous organosilica with different pore sizes — •Martin Andreas Schreiber1, Martin Güngerich1, Wolfram Heimbrodt1, Torsten Henning2, Peter Jens Klar2, Vivian Rebbin3, Michael Fröba3, Lutz Eichhorn4, Jürgen Brandner4, and Klaus Schubert4 — 1Dept. Physics and WZMW, Philipps University of Marburg, Germany — 21. Physics Institute, Justus-Liebig-University of Gießen, Germany — 3Institute of Inorganic and Analytical Chemistry, Justus-Liebig-University of Gießen, Germany — 4Forschungszentrum Karlsruhe, IMVT, Eggenstein-Leopoldshafen, Germany
Periodic mesoporous organosilica (PMOs) are organic-inorganic hybrid materials with regular pore systems and well-defined pore sizes in the range of 3 to 15 nm yielding inner surfaces of about 1000 m2/g. Two-point attached organic units within the silica matrix in the pore walls are a genuine part of the 3D pore wall framework. These organic functionalisations is very versatile making these hybrids interesting for applications in catalysis and micro-reactor technology.
Here we study the adsorption and desorption behavior in dependence of the pore-size of benzene-functionalized and ethane-functionalized PMOs in the temperature range between 20 and 140∘C by Raman spectroscopy. We find significant differences in the adsorption-desorption behaviour for the solvents ethanol and benzene suggesting that PMOs make a selective separation of solvent vapours possible.