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- W2000262272 abstract "Viscosity experiments in some polar liquids which can be easily supercooled have shown that a sudden change of activation energy for viscous flow occurs at a temperature near the melting point. This seems to be due to some structural variation inside the liquid such as a molecular rearrangement. The effects of these structural changes on sound velocity have been investigated by Hunter [A. N. Hunter, Proc. Phys. Soc. (London) B64, 1086 (1951)] in menthol and by Petralia and Cevolani [S. Petralia and M. Cevolani, Ricerca sci. 21, 1623 (1951)] in salol. Hunter reported a slight variation of the temperature coefficient of velocity at the freezing point of menthol; Petralia and Cevolani found no effect in salol within the precision (1/1000) of their method of measurement. In the present research a high precision (about 1/10 000) acoustical interferometer which uses an optical method to detect movements of the reflector by halves of acoustical wavelengths has been employed for studying sound velocity in menthol and salol. For both liquids the temperature coefficient of velocity is higher in the supercooled than in normal region. In salol a transition zone (42–46°C) has been found in which the temperature coefficient of velocity is smaller than either at higher or at lower temperatures. A narrower transition region is probably present also in menthol, masked by a variation of temperature coefficient between normal and supercooled liquids higher than in salol. These results suggest that the changes of structure which take place when these liquids are supercooled are mainly due to formation of molecular associations." @default.
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- W2000262272 date "1956-07-01" @default.
- W2000262272 modified "2023-09-23" @default.
- W2000262272 title "Ultrasonic Velocity in Supercooled Liquids" @default.
- W2000262272 doi "https://doi.org/10.1121/1.1905141" @default.
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