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High frequency shear ultrasonic properties of water/sorbitol solutions
1University Montpellier II, Institut d'Electronique du Sud CC 082, UMR CNRS 5214, Place Eugène Bataillon, 34095 Montpellier, France.
Abstract:
Dynamic viscoelastic properties (G' and G''), ultrasonic shear velocity and attenuation were measured for aqueous solutions of sorbitol at 5 MHz. For pure sorbitol, the shear ultrasonic velocity reached 1470 ms(-1) with a density of 1500 kgm(-3), consequently leading to a high acoustical impedance compared with "classical" polymers (polystyrene, nylon, polyethylene, Teflon, etc.). We demonstrate that this surprisingly high shear ultrasonic velocity for a viscoelastic material was due to the fact that the glass transition begins at a concentration above 85% of sorbitol in water. Hence, pure sorbitol is an ideal coupling material for high frequency shear experiments.
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