Glass Transition Process of Amorphous Quinidine Studied by Using Brillouin Light Scattering

The acoustic properties of amorphous quinidine were investigated by using Brillouin spectroscopy as a function of temperature. The longitudinal sound velocity and the acoustic absorption coefficient showed drastic changes in their slopes at the glass transition temperature of 328 K, which was nearly...

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Bibliographic Details
Published in:Journal of the Korean Physical Society 2018, 72(4), , pp.522-526
Main Authors: Hong, Jung Taek, Ko, Jae-Hyeon, Kim, Tae Hyun
Format: Article
Language:English
Subjects:
Absorptivity
Acoustic absorption
Acoustic properties
Acoustic velocity
Acoustics
Crystallization
Glass transition temperature
Mathematical and Computational Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Temperature
Theoretical
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Summary:The acoustic properties of amorphous quinidine were investigated by using Brillouin spectroscopy as a function of temperature. The longitudinal sound velocity and the acoustic absorption coefficient showed drastic changes in their slopes at the glass transition temperature of 328 K, which was nearly the same as the thermodynamic and the dielectric glass transition temperatures. The clear difference between the crystalline state and the amorphous state of quinidine, as well as the crystallization process, could be revealed by observing the change in the Brillouin spectrum. Analysis of the lowtemperature absorption coefficient showed that the excess acoustic damping could be attributed to intramolecular relaxation motions, such as side-group rotations.
ISSN:0374-4884
1976-8524
DOI:10.3938/jkps.72.522