Journal ArticleDOI
Dynamic heterogeneity in supercooled ortho-terphenyl studied by multidimensional deuteron NMR
TLDR
In this article, the authors used deuteron NMR to study molecular reorientation rates and rate exchange processes in supercooled ortho-terphenyl, and monitored the re-equilibration of different subensembles through four-time stimulated echo experiments.Abstract:
Using deuteron NMR, we have studied molecular reorientation rates and rate exchange processes in supercooled ortho-terphenyl. We monitor the re-equilibration of differently selected subensembles through four-time stimulated echo experiments. A comparison of the two-time with the four-time echoes suggests that the characteristic time scales for reorientation and dynamical exchange are relatively similar. The four-time correlation functions were described using various multi-state rate exchange models.read more
Citations
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Journal ArticleDOI
Supercooled liquids and the glass transition
TL;DR: Current theoretical knowledge of the manner in which intermolecular forces give rise to complex behaviour in supercooled liquids and glasses is discussed.
Journal ArticleDOI
Spatially Heterogeneous Dynamics in Supercooled Liquids
TL;DR: In this review, the experimental work that characterizes spatially heterogeneous dynamics in supercooled liquids is described and the following questions are addressed: How large are the heterogeneities?
Journal ArticleDOI
Relaxation in glassforming liquids and amorphous solids
TL;DR: The field of viscous liquid and glassy solid dynamics is reviewed by a process of posing the key questions that need to be answered, and then providing the best answers available to the authors and their advisors at this time as mentioned in this paper.
Journal ArticleDOI
Three-Dimensional Direct Imaging of Structural Relaxation Near the Colloidal Glass Transition
TL;DR: Confocal microscopy was used to directly observe three-dimensional dynamics of particles in colloidal supercooled fluids and colloidal glasses; connected clusters of these mobile particles could be identified; and the cluster size distribution, structure, and dynamics were investigated.
Journal ArticleDOI
Heterogeneity at the glass transition: a review
TL;DR: Theoretical concepts and experimental evidence of heterogeneity in glass-forming liquids and polymers are reviewed in this paper, where the main purpose is to provide an introduction to theoretical developments and recent experiments which have led to rapidly increasing knowledge.
References
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Journal ArticleDOI
Rate memory of structural relaxation in glasses and its detection by multidimensional NMR.
TL;DR: Applying the theory to multidimensional NMR exchange experiments, the rate memory of a polymer slightly above its glass transition temperature is determined, indicating strong coupling of the individual relaxation modes.
Journal ArticleDOI
Nonexponential 2H spin-lattice relaxation as a signature of the glassy state
TL;DR: In this article, it was shown that at temperatures more than ten to twenty degrees above the calorimetric glass transition temperature Tg the 2H spin-lattice relaxation is exponential; below that temperature regime the relaxation is nonexponential.
Journal ArticleDOI
Molecular motion in amorphous polymers. Consideration of the mechanism for α, β and (αβ) dielectric relaxations
TL;DR: In this article, it was shown that the cross correlation terms in the polymer dipole correlation function are a combination of equilibrium dipole correlations and certain time dependent correlations for a reference dipole in a chain.
Journal ArticleDOI
Glassy relaxation at surfaces: The correlation length of cooperative motion in the facilitated kinetic Ising model
Scott Butler,Peter Harrowell +1 more
TL;DR: In this article, a measure of cooperativity in glassy liquids is defined in terms of the kinetic correlation length of relaxation at a surface, and its temperature dependence is measured for the facilitated kinetic Ising model with both free and pinned surfaces.
Journal ArticleDOI
Universalities in the primary response of condensed matter
TL;DR: In this paper, a modified Dixon-Nagel scaling for CvS-like behavior is proposed, and a model of mesoscopic domains with internal degrees of freedom is used to provide a common physical basis for both universalities.