Dresden 2006 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 24: POSTER Microfluidics
CPP 24.17: Poster
Thursday, March 30, 2006, 17:00–19:00, P2
Adsorption and desorption of solvents by periodic mesoporous organosilica of different pore sizes — •M.A. Schreiber1, M. Güngerich1, P.J. Klar1, W. Heimbrodt1, J. Morell2, V. Rebbin2, M. Fröba2, T. Henning3, L. Eichhorn3, J.J. Brandner3, and K. Schubert3 — 1Dept. Physics and WZMW, Philipps-University of Marburg, Germany — 2Institute of Inorganic and Analytical Chemistry, Justus-Liebig-University, Gießen, Germany — 3Forschungszentrum Karlsruhe, IMVT, Eggenstein-Leopoldshafen, Germany
Periodic mesoporous silica (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. The organic units in the pore walls are two-point attached within the silica matrix through covalent bonds and therefore are homogenously distributed and a genuine part of the 3D pore wall framework. The choice of the organic functionalisation is very versatile making these hybrids interesting for applications in catalysis and micro-reactor technology. Here we study the adsorption and desorption behaviour of the solvents ethanol and benzene by benzene-functionalized and ethane-functionalized PMOS with different pore sizes in the temperature range between 20 and 140 ∘C by Raman spectroscopy. We find significant differences in the adsorption-desorption behaviour for different solvents as well as for different pore sizes suggesting that PMOs make a selective separation of solvent vapours possible.