Abstract
The low-temperature acoustic properties of cryoprotective ionic liquid and trehalose aqueous solutions were studied by Brillouin scattering measurement. The refractive index was measured by the prism coupling method to determine the sound velocity and attenuation accurately from the Brillouin shift and full width at half maximum (FWHM). The structural relaxation time related to liquid–glass transition was determined as a function of temperature. The fragility indices of the glass transitions were determined by temperature-modulated differential scanning calorimetry.
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