Abstract
We studied the cluster structure of ethylene glycol aqueous solutions by Brillouin and Raman scattering. We measured the ultrasonic sound velocity of the sample by Brillouin scattering. From the concentration dependence of the sound velocity, we discussed the properties of cluster structure related to glass transitions. The number of H_2O molecule neighboring a EG becomes a little higher with increasing temperature and the association between EG molecules and H_2O molecules weakened with increasing temperature. We showed that Brillouin scattering is a powerful tool to investigate the dynamics of cluster structure in liquid. The OD stretching bond was measured by Raman scattering to discuss the hydrogen bonds among molecules.
