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DF: Dielektrische Festkörper

DF 3: Poster Session

DF 3.11: Poster

Montag, 27. März 2006, 09:30–17:00, P1

CONDUCTIVITY OF NANOSTRUCTURED MESOPOROUS MCM-41 MOLECULAR SIEVE MATERIALS — •Martynas Kinka, Juras Banys, Jan Macutkevic, and Agnius Meskauskas — Faculty of Physics, Vilnius University, Sauletekio 9, 2040 Vilnius, Lithuania

Dielectric response of water confined in MCM-41 molecular sieve materials showed a power law dispersion, which was assigned to ac conductivity. This process, which occurs at temperatures close to room temperature, was found in all our investigated samples with the pore diameters ranging from 2.0 nm to 3.7 nm. Obtained values of the imaginary part of the complex dielectric permittivity were much larger than that of the bulk water. Such a phenomenon can be explained by the electrical response characteristic of the microstructural electrical network formed by water and hosting mesoporous silica material. The real part of conductivity has been calculated, and the influence of the pores size to electric conductivity and its mechanisms is discussed.