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Ultrasonic determination of the effect of shear on lipid crystallization
Author(s) -
Garbolino Chiara,
Ziegler Gregory R.,
Coupland John N.
Publication year - 2000
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-000-0025-5
Subject(s) - rheometer , crystallization , materials science , ultrasonic sensor , shear rate , shear (geology) , composite material , mixing (physics) , rheology , thermodynamics , acoustics , physics , quantum mechanics
The design and calibration of a novel rheometer incorporating ultrasonic sensors are described. The instrument is capable of the simultaneous measurements of torque, rate of temperature change, and ultrasonic properties of a liquid as a function of time, temperature, and shear rate. The effect of shear rate on the crystallization onset temperature of a sample of confectionery coating fat is studied using this device. The instrument detected the phase transition in the sheared sample as abrupt changes in all of the measured parameters. The onset temperature increased significantly with shear rate, implying lipid crystallization can be accelerated by mixing. There were also significant differences between sensing modalities.