Broadband Dielectric Spectroscopy of Water Confined in MCM-41 Molecular Sieve Material

• Published in: Ferroelectrics Vol. 318; no. 1; pp. 201 - 207
• Main Authors: Banys, J., Kinka, M., Meskauskas, A., Macutkevic, J., VöLkel, G., Böhlman, W., Umamaheswari, V., Hartmann, M., Pöppl, A.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: London Taylor & Francis Group 01.01.2005; Taylor and Francis
• Subjects: 77.22.Gm; 78.55.Mb; adsorbed water; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric properties of solids and liquids; dielectric spectroscopy; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Exact sciences and technology; MCM-41; Molecular sieve materials; Physics; Water; Pore size; 77.22.Gm; 78.55.Mb; Adsorption; Porous materials; Dielectric properties; Molecular sieves; Mesoporosity; Molecular sieve materials; MCM-41; dielectric spectroscopy; adsorbed water
• ISSN: 0015-0193; 1563-5112
• DOI: 10.1080/00150190590966388

Dielectric properties of water adsorbed in pure siliceous mesoporous MCM-41 material with pore diameter of 3.7 nm have been investigated in the frequency range from 20 Hz to 1 MHz for temperature interval from 100 K to 400 K. The dielectric spectra revealed three dispersion regions of characteristic shape. Analysis of relaxation processes showed that dynamics of water molecules is strongly affected by interaction with the pore surface. Two types of water-relatively free water in the centers of mesopores and "bound" water on the pore surface-can be distinguished.