Regensburg 2007 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: POSTER: Micro and Nano Fluidics

CPP 19.3: Poster

Mittwoch, 28. März 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.