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Slow dynamics of salol: a pressure and temperature dependent light scattering study
- Publication Year :
- 2014
-
Abstract
- We study the slow dynamics of salol by varying both temperature and pressure using photon correlation spectroscopy and pressure-volume-temperature measurements, and compare the behavior of the structural relaxation time with equations derived within the Adam-Gibbs entropy theory and the Cohen-Grest free volume theory. We find that pressure-dependent data are crucial to assess the validity of these model equations. Our analysis supports the entropy-based equation, and estimates the configurational entropy of salol at ambient pressure approximately 70% of the excess entropy. Finally, we investigate the evolution of the shape of the structural relaxation process, and find that a time-temperature-pressure superposition principle holds over the range investigated.
- Subjects :
- Physics
Superposition principle
Dynamic light scattering
Free volume theory
Relaxation (NMR)
Configuration entropy
Entropy (information theory)
Thermodynamics
Soft Condensed Matter (cond-mat.soft)
FOS: Physical sciences
Condensed Matter - Soft Condensed Matter
Light scattering
Ambient pressure
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....653871388e74a19e1c9d635803ac8489