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Ultrasonic relaxation study in gelatin sols and gels

Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, ISSN: 0021-4922, Vol: 39, Issue: 5 B, Page: 2898-2901
2000
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Ultrasonic absorption was measured in gelatin sols and gels in the frequency range of 0.2-35 MHz. Two techniques, a plano-concave resonator method and optical beam deflection by ultrasonic waves, were used to cover the wide frequency range. The absorption spectra observed both in the sols and gels were well fitted to the relaxation curves, assuming the Cole-Cole-type distribution of relaxation times. A change in relaxation parameters upon gelation was obtainedthe relaxation frequency decreased, the relaxation strength increased and the distribution became wider. The relaxation mechanism is discussed in the light of the hydration equilibrium of gelatin polymers. © 2000 The Japan Society of Applied Physics.

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