Title :
Dielectric investigation of β-cyclodextrin hydrates and inclusion complexes
Author :
Anagnostopoulou-Konsta, A. ; Apekis, L. ; Tsoukaris, G.
Author_Institution :
Dept. of Phys., Nat. Tech. Univ. of Athens, Greece
fDate :
8/1/1992 12:00:00 AM
Abstract :
The dielectric behavior of β-CD hydrates and β-CD inclusion complexes with various organic guest molecules has been studied mainly by the thermally stimulated depolarization current (TSDC) method in the temperature range 80 to 300 K. Some preliminary measurements have also been carried out by conventional AC techniques at room temperature. Results are discussed in relation to the corresponding structure as determined by X-ray diffraction and are compared with differential scanning calorimetry data reported in the literature. The main high-temperature (200 to 280 K) peak recorded with the TSDC method is shown to be directly related to a phase transition occurring near the peak temperature. Water enclosed in the β-CD cavity seems to play a very important role as far as this transition is concerned
Keywords :
X-ray diffraction examination of materials; crystal atomic structure of organic compounds; organic compounds; phase transformations; thermally stimulated currents; β-CD hydrates; β-cyclodextrin hydrates; 80 to 300 K; AC techniques; H2O inclusion; TSDC; TSDC method; X-ray diffraction; dielectric behavior; differential scanning calorimetry data; enclosed water; inclusion complexes; organic guest molecules; phase transition; room temperature; thermally stimulated depolarization current; Conductivity; Current measurement; Dielectric measurements; Electrochemical impedance spectroscopy; Flip-flops; Hydrogen; Neutrons; Physics; Temperature distribution; X-ray diffraction;
Journal_Title :
Electrical Insulation, IEEE Transactions on
