caa a22 4500 475763548 CHVBK 20180406123558.0 cr unu---uuuuu 170329e20000601xx s 000 0 eng 10.1007/s003960050549 doi (NATIONALLICENCE)springer-10.1007/s003960050549 Dielectric properties and Fourier transform IR analysis of MCM-48, Al-MCM-48 and Ti-MCM-48 mesoporous materials [Elektronische Daten] [G. Øye, E. Axelrod, Y. Feldman, J. Sjöblom, M. Stöcker]  Broad-band dielectric spectroscopy was used to investigate the dielectric properties of the meso- porous materials MCM-48, Al-MCM-48 and Ti-MCM-48. The samples were examined in the frequency range from 20 Hz to 1 MHz and in the temperature range from −100 to 250 °C. The dielectric relaxation of the materials has a complex nonexponential behavior with some common features for all the samples. The dielectric spectroscopy and Fourier transform IR measurements identified the relaxation process related to percolation of H+ ions associated with silanol groups and water adsorbed in the materials. The non-Debye behavior of the macroscopic dipole correlation functions related to the percolation process allowed us to extract the fractal dimensions of the paths of excitation transfer within the porous medium, and the porosity of each sample was estimated. Springer-Verlag Berlin Heidelberg, 2000 Key words Dielectric spectroscopy nationallicence FT-IR spectroscopy nationallicence Mesoporous materials nationallicence MCM-48 nationallicence Al-MCM-48 nationallicence Ti-MCM-48 nationallicence Øye G. Department of Chemistry University of Bergen Allégaten 41 5007 Bergen, Norway, NO aut Axelrod E. Department of Applied Physics The Hebrew University of Jerusalem Givat Ram, 91904 Jerusalem, Israel, IL aut Feldman Y. Department of Applied Physics The Hebrew University of Jerusalem Givat Ram, 91904 Jerusalem, Israel, IL aut Sjöblom J. Department of Chemistry University of Bergen Allégaten 41 5007 Bergen, Norway, NO aut Stöcker M. SINTEF Applied Chemistry P.O. Box 124, Blindern 0314 Oslo, Norway, NO aut https://doi.org/10.1007/s003960050549 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960050549 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Øye G. Department of Chemistry University of Bergen Allégaten 41 5007 Bergen, Norway, NO aut NATIONALLICENCE 700 1- Axelrod E. Department of Applied Physics The Hebrew University of Jerusalem Givat Ram, 91904 Jerusalem, Israel, IL aut NATIONALLICENCE 700 1- Feldman Y. Department of Applied Physics The Hebrew University of Jerusalem Givat Ram, 91904 Jerusalem, Israel, IL aut NATIONALLICENCE 700 1- Sjöblom J. Department of Chemistry University of Bergen Allégaten 41 5007 Bergen, Norway, NO aut NATIONALLICENCE 700 1- Stöcker M. SINTEF Applied Chemistry P.O. Box 124, Blindern 0314 Oslo, Norway, NO aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer