Title :
Dielectric study of dry and hydrated microcrystalline cellulose
Author_Institution :
Nat. Tech. Univ. of Athens, Greece
Abstract :
Thermally stimulated depolarization current (TSDC) measurements on dry and hydrated compressed pellets of microcrystalline cellulose, in the temperature range of 77-300 K, show three main dielectric dispersion bands: (i) a complex band in the region of 80-200 K, attributed to the reorientation of polar groups of cellulose; (ii) a broad peak in the region of 128-145 K, attributed to the polarization of loosely bound sorbed water molecules, which for high water content dominate in this temperature region; and (iii) a broad dispersion peak appearing in the region of 180-260 K, attributed to the motion of polar groups of cellulose facilitated by sorbed water
Keywords :
molecular biophysics; organic compounds; thermally stimulated currents; 77 to 300 K; dielectric dispersion bands; microcrystalline cellulose; thermally stimulated depolarisation; Current measurement; Density measurement; Dielectric losses; Dielectric measurements; Dispersion; Motion measurement; Particle measurements; Polarization; Temperature distribution; Thickness measurement;
Conference_Titel :
Electrets, 1988. (ISE 6) Proceedings., 6th International Symposium on (IEEE Cat. No.88CH2593-2)
Conference_Location :
Oxford
DOI :
10.1109/ISE.1988.38563
