Abstract
Abstract : We determined the equation of state of ballistic gelatin (20%) using Brillouin scattering spectroscopy with diamond anvil cells by measuring the pressure dependence of the sound velocities of the material from ambient pressure to 12 GPa at room temperature. We extended these measurements to 4%- and 10% gelatin solutions up to 12 GPa. Consistent results for 4%- and 10%-gelatin in several experimental runs were not obtained. For comparison purposes, we also measured the pressure dependence of sound velocity of lamb tissues up to 10 GPa. We analyzed the Brillouin data using the Vinet equation of state and obtained the bulk modulus and its pressure derivative. We compared the parameters obtained for gelatin with several relevant polymer materials as well as water. In addition, we discussed the possibility of ultrasonic measurements on gelatin solutions under similar conditions. Such measurements are expected to provide useful information in understanding of the relaxation phenomena in gelatins.
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