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Dielectric properties and Fourier transform IR analysis of MCM-48, Al-MCM-48 and Ti-MCM-48 mesoporous materials

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Abstract

 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.

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Authors and Affiliations

  1. Department of Chemistry University of Bergen Allégaten 41 5007 Bergen, Norway, , , , , , NO

    G. Øye & J. Sjöblom

  2. Department of Applied Physics The Hebrew University of Jerusalem Givat Ram, 91904 Jerusalem, Israel, , , , , , IL

    E. Axelrod & Y. Feldman

  3. SINTEF Applied Chemistry P.O. Box 124, Blindern 0314 Oslo, Norway, , , , , , NO

    M. Stöcker

Authors
  1. G. Øye
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  2. E. Axelrod
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  3. Y. Feldman
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  4. J. Sjöblom
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  5. M. Stöcker
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Received: 7 September 1999 Accepted: 10 December 1999

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Øye, G., Axelrod, E., Feldman, Y. et al. Dielectric properties and Fourier transform IR analysis of MCM-48, Al-MCM-48 and Ti-MCM-48 mesoporous materials. Colloid Polym Sci 278, 517–523 (2000). https://doi.org/10.1007/s003960050549

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  • DOI: https://doi.org/10.1007/s003960050549

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