期刊
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
卷 93, 期 1, 页码 281-287出版社
SPRINGER
DOI: 10.1007/s10973-007-8835-8
关键词
activation energy; chiral recognition; dielectric analysis (DEA); dipole orientation; polarization
Dielectric analysis (DEA), supported by thermogravimetric analysis (TG), differential scanning calorimetry (DSC), powder X-ray diffraction analysis (PXRD) and photomicrography, reveal the chiral difference in the amino acids. The acids are classified as dielectric materials based on their structure, relating chirality to the vector sum of the average dipole moment, composed of the constant optical (electronic) and infra-red (atomic) polarizabilities, as well as dipole orientation. This study encompasses 14 L-and D-amino acid isomers. Physical properties recorded include AC electrical conductivity, charge transfer complexes, melting, recrystallization, amorphous and crystalline phases, and relaxation spectra, activation energies and polarization times for the electrical charging process.
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