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

Volume

27

Issue

4

fYear

1992

fDate

8/1/1992 12:00:00 AM

Firstpage

801

Lastpage

806

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;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.155801

Filename

155801