2003/05/15 by Lucia Comez, Daniele Fioretto, D. Fioretto +4 · 2 citations
Chemical Engineering · Materials Science · Physics and Astronomy · #Liquid Crystal Research Advancements #Material Dynamics and Properties #Thermodynamic properties of mixtures #cond-mat.soft
paper · pdf · doi:10.1063/1.1601608
RevTeX4, 14 pages, 9 EPS figures
arxiv created 2003/05/15 · openalex publication_date 2003/09/08 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Brillouin scattering has been used to measure the dynamic structure factor of glycerol as a function of temperature from the high temperature liquid to the glassy state. Our investigation aims at understanding the number and the nature of the relaxation processes active in this prototype glass forming system in the high frequency region. The associated character of glycerol is reflected by a rather simple relaxation pattern, while the contributions coming from intramolecular channels are negligible in the GHz frequency region. The temperature behavior of the characteristic frequency and lifetime of the longitudinal acoustic modes is analyzed, suggesting that a phenomenological model which only includes the structural (α) process and the unrelaxed viscosity is able to catch the leading contributions to the dynamics of the density fluctuations. This ansatz is also supported by a combined analysis of light and inelastic x-ray scattering spectra. The temperature dependence of the characteristic time of the α-process, τα, obtained by a full-spectrum analysis conforms to the α-scale universality, i.e., the values τα revealed by different experimental techniques are proportional to the others. The nonerogodicity parameter smoothly decreases on increasing the temperature, and no signature of the cusplike behavior predicted by the idealized mode coupling theory and observed in other glass-formers is found in glycerol.