Title

Thermally-induced Dielectric Relaxation Spectra in Three Aldohexose Monosaccharides

Document Type

Article

Publication Date

4-2012

Publication Title

Journal of Thermal Analysis and Calorimetry

Abstract

Three aldohexose monosaccharides, d-glucose, d-mannose, and d-galactose, were examined by scanning temperature dielectric analysis (DEA) from ambient temperatures through their melts. Phase transitions, including glass transition (T g) and melting temperature (T m), were evaluated by differential scanning calorimetry (DSC). The monosaccharides were found to exhibit thermally-induced dielectric loss spectra in their amorphous-solid phase before melting. Activation energies for electrical charging of each of the monosaccharides were calculated from an Arrhenius plot of the tan delta (e″/e′, dielectric loss factor/relative permittivity) peak frequency versus reciprocal temperature in Kelvin. The DEA profiles were also correlated with the DSC phase diagrams, showing the changes in electrical behavior associated with solid–solid and solid–liquid transitions.

Comments

This research was cited as the best undergraduate poster in competition at the North American Thermal Analysis Society, NATAS 2010 in Philadelphia PA.

DOI

10.1007/s10973-011-1923-9

Volume

108

Issue

1