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

G. Øye; E. Axelrod; Y. Feldman; J. Sjöblom; M. Stöcker

doi:10.1007/s003960050549

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

G. Øye, E. Axelrod, Y. Feldman^*, J. Sjöblom, M. Stöcker

^*Corresponding author for this work

The Institute of Applied Physics

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

Broad-band dielectric spectroscopy was used to investigate the dielectric properties of the mesoporous materials MCM-48, A1-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.

Original language	English
Pages (from-to)	517-523
Number of pages	7
Journal	Colloid and Polymer Science
Volume	278
Issue number	6
DOIs	https://doi.org/10.1007/s003960050549
State	Published - 2000

Keywords

Al-MCM-48
Dielectric spectroscopy
FT-IR spectroscopy
MCM-48
Mesoporous materials
Ti-MCM-48

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10.1007/s003960050549

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

abstract = "Broad-band dielectric spectroscopy was used to investigate the dielectric properties of the mesoporous materials MCM-48, A1-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.",

keywords = "Al-MCM-48, Dielectric spectroscopy, FT-IR spectroscopy, MCM-48, Mesoporous materials, Ti-MCM-48",

author = "G. {\O}ye and E. Axelrod and Y. Feldman and J. Sj{\"o}blom and M. St{\"o}cker",

year = "2000",

doi = "10.1007/s003960050549",

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T1 - Dielectric properties and Fourier transform IR analysis of MCM-48, Al-MCM-48 and Ti-MCM-48 mesoporous materials

AU - Øye, G.

AU - Axelrod, E.

AU - Feldman, Y.

AU - Sjöblom, J.

AU - Stöcker, M.

PY - 2000

Y1 - 2000

N2 - Broad-band dielectric spectroscopy was used to investigate the dielectric properties of the mesoporous materials MCM-48, A1-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.

AB - Broad-band dielectric spectroscopy was used to investigate the dielectric properties of the mesoporous materials MCM-48, A1-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.

KW - Al-MCM-48

KW - Dielectric spectroscopy

KW - FT-IR spectroscopy

KW - MCM-48

KW - Mesoporous materials

KW - Ti-MCM-48

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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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Keywords

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