Journal ArticleDOI
Spatially Heterogeneous Dynamics in Supercooled Liquids
TLDR
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?Abstract:
Although it has long been recognized that dynamics in supercooled liquids might be spatially heterogeneous, only in the past few years has clear evidence emerged to support this view. As a liquid is cooled far below its melting point, dynamics in some regions of the sample can be orders of magnitude faster than dynamics in other regions only a few nanometers away. In this review, the experimental work that characterizes this heterogeneity is described. In particular, the following questions are addressed: How large are the heterogeneities? How long do they last? How much do dynamics vary between the fastest and slowest regions? Why do these heterogeneities arise? The answers to these questions influence practical applications of glass-forming materials, including polymers, metallic glasses, and pharmaceuticals.read more
Citations
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Extraordinary Slowing of Structural Dynamics in Thin Films of a Room Temperature Ionic Liquid
TL;DR: It is demonstrated quantitatively that the influence of an interface on RTIL properties is profoundly different from that observed in other classes of liquids, which has major implications for the use of RTILs in devices and other applications.
Journal ArticleDOI
Role of local structure on motions on the potential energy landscape for a model supercooled polymer.
Tushar Jain,Juan J. de Pablo +1 more
TL;DR: Detailed Monte Carlo and molecular dynamics simulations of a model glass forming polymeric system near its apparent glass transition temperature establish an important connection between the local structure of glass formers and the activated dynamics, thereby providing insights into the origins of dynamic heterogeneities.
Journal ArticleDOI
Surface tension fluctuations and a new spinodal point in glass-forming liquids
TL;DR: In this paper, the surface tension in a model glass-former was measured and it was shown that it vanishes at the energy separating minima from saddles, demonstrating the existence of a spinodal point for amorphous metastable order.
Journal ArticleDOI
Relaxation times of kinetically constrained spin models with glassy dynamics
TL;DR: In this article, a multi-scale approach is proposed to connect the timescales to the typical size of the regions which have to be rearranged to create/destruct a particle.
Journal ArticleDOI
Diffusion of ferrocene methanol in super-cooled aqueous solutions using cylindrical microelectrodes
TL;DR: In this paper, the diffusion of ferrocene methanol in super-cooled aqueous solutions containing sucrose has been studied, using disk and cylindrical microelectrodes, over a wide viscosity range.
References
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Journal ArticleDOI
On the Temperature Dependence of Cooperative Relaxation Properties in Glass‐Forming Liquids
Gerold Adam,Julian H. Gibbs +1 more
TL;DR: In this paper, a molecularkinetic theory was proposed to explain the temperature dependence of relaxation behavior in glass-forming liquids in terms of the temperature variation of the size of the cooperatively rearranging region.
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Formation of glasses from liquids and biopolymers.
TL;DR: The onset of a sharp change in ddT( is the Debye-Waller factor and T is temperature) in proteins, which is controversially indentified with the glass transition in liquids, is shown to be general for glass formers and observable in computer simulations of strong and fragile ionic liquids, where it proves to be close to the experimental glass transition temperature.
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Nonexponential relaxations in strong and fragile glass formers
TL;DR: In this article, a broad correlation of non-debye behavior with non-Arrhenius relaxations was found for different types of glass formers, distinguished by their respective molecular complexity.
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Supercooled Liquids and Glasses
TL;DR: A review of recent progress in the study of supercooled liquids and glasses can be found in this article, where several basic features of the dynamics and thermodynamics of super cooled liquid and glasses are described.
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Size-Dependent Depression of the Glass Transition Temperature in Polymer Films
TL;DR: In this article, the glass transition temperature of thin polystyrene films has been measured as a function of film thickness, and it was found that the transition decreases in temperature as the thickness of the film is reduced.