High frequency shear ultrasonic properties of water/sorbitol solutions.
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.
Camara
V Cereser
VC
University Montpellier II, Institut d'Electronique du Sud CC 082, UMR CNRS 5214, Place Eugène Bataillon, 34095 Montpellier, France.
Laux
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D003198:Computer Simulation; D055119:Elastic Modulus; D008027:Light; D008422:Materials Testing / Q000379:methods*; D008956:Models, Chemical; D009391:Nephelometry and Turbidimetry / Q000379:methods*; D044367:Phase Transition; D012542:Scattering, Radiation; D033081:Shear Strength; D012996:Solutions; D013012:Sorbitol / Q000032:analysis / Q000737:chemistry*; D014463:Ultrasonography / Q000379:methods*; D014783:Viscosity; D014867:Water / Q000032:analysis / Q000737:chemistry*
D012996:Solutions; D014867:Water; D013012:Sorbitol