Title :
Photoacoustic study of thermal relaxation in fragile liquid
Author_Institution :
Inst. of Appl. Phys., Tsukuba Univ., Ibaraki, Japan
Abstract :
The photoacoustic dispersive anomalies of glass transitions were measured by utilizing the gas-microphone method in propylene glycol and glycerol, which are typical materials of the fragile liquid. The temperature dependence of the mean relaxation time was obtained. It was analyzed by the Vogel-Tammann-Fulcher law. It was found that the obtained parameter is in agreement with the values determined by the measurements of the dielectric dispersion reported previously. The distribution of the relaxation time was analyzed by the use of the Cole-Cole plot, and the parameter of the Davidson-Cole formula was determined
Keywords :
glass transition (glasses); organic compounds; photoacoustic effect; specific heat of liquids; Cole-Cole plot; Davidson-Cole formula; Vogel-Tammann-Fulcher law; complex heat capacity; fragile liquid; gas-microphone method; glass transitions; glycerol; mean relaxation time; photoacoustic dispersive anomalies; propylene glycol; temperature dependence; thermal relaxation; Anti-freeze; Dielectric materials; Dielectric measurements; Dispersion; Glass; Liquids; Phase detection; Phase frequency detector; Physics; Temperature dependence;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171577
