Dieletric and physicochemical study of the hydration process in cellulose

Author

Vartzeli-Nikaki, P. ; Kripotou, S. ; Konsta, A.A.

Author_Institution

Dept. of Phys., Nat. Tech. Univ. of Athens, Greece

fYear

2005

fDate

11-14 Sept. 2005

Firstpage

243

Lastpage

246

Abstract

The hydration mechanism of natural cellulose and microcrystalline cellulose is studied by water sorption isotherms measurement, as well as by thermally stimulated depolarization currents (TSDC) and broad band dielectric relaxation spectroscopy (DRS), in the temperature range 77-300 K and the frequency range 10-10⁶ Hz. The dependence of the hydration procedure on cellulose crystallinity is investigated and a comparison of results obtained by water sorption, TSDC and DRS is attempted. The behaviour of dc-conductivity and its role on the biological functions of living organisms is emphasized.

Keywords

cellular biophysics; dielectric relaxation; electrical conductivity; solvation; sorption; thermally stimulated currents; water; 10 to 10⁶ Hz; 77 to 300 K; H₂O; broad band dielectric relaxation spectra; dc-conductivity; hydration process; microcrystalline cellulose; natural cellulose; physicochemical study; thermally stimulated depolarization currents; water sorption isotherms; Absorption; Crystallization; Current measurement; Dielectrics; Electrochemical impedance spectroscopy; Frequency; Humidity; Physics; Temperature distribution; Thermal conductivity;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 2005. ISE-12. 2005 12th International Symposium on

Print_ISBN

0-7803-9116-0

Type

conf

DOI

10.1109/ISE.2005.1612366

Filename

1612366