Journal ArticleDOI
From strong to fragile glass formers: Secondary relaxation in polyalcohols
TLDR
It is found that in sorbitol the dynamics of the whole molecule contributes equally to the beta process, while in glycerol the hydrogen bond forming OH groups remain rather rigid compared to the hydrogens bonded to the carbon skeleton.Abstract:
We have studied details of the molecular origin of slow secondary relaxation near T(g) in a series of neat polyalcohols by means of dielectric spectroscopy and (2)H NMR. From glycerol to threitol, xylitol, and sorbitol the appearance of the secondary relaxation changes gradually from a wing-type scenario to a pronounced beta peak. It is found that in sorbitol the dynamics of the whole molecule contributes equally to the beta process, while in glycerol the hydrogen bond forming OH groups remain rather rigid compared to the hydrogens bonded to the carbon skeleton.read more
Citations
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Journal ArticleDOI
Classification of secondary relaxation in glass-formers based on dynamic properties.
K. L. Ngai,Marian Paluch +1 more
TL;DR: This work identifies the class of secondary relaxations that bears a strong connection or correlation to the primary relaxation in all the dynamic properties and proposes that only these should be called the Johari-Goldstein beta-relaxation.
Journal ArticleDOI
An extended coupling model description of the evolution of dynamics with time in supercooled liquids and ionic conductors
TL;DR: In this paper, the authors extend the coupling model to also address the dynamics in these earlier time regimes, and the crux of the extended coupling model is the quantitatively determinable independent relaxation time, from which the characteristics of the dynamics can be deduced.
Journal ArticleDOI
The β relaxation in metallic glasses: an overview
TL;DR: In this article, a review of the features of secondary relaxations and their relations to other processes and properties in metallic glasses is presented. But the focus is on their current roles and future promise in understanding the glass transition phenomenon, mechanical properties and mechanisms of plastic deformation, diffusion, physical aging and stability and crystallization of metallic glasses.
Journal ArticleDOI
Hydrogen bonding and the cryoprotective properties of glycerol/water mixtures.
TL;DR: The ability of Glycerol/water mixtures to inhibit ice crystallization is linked to the concentration of glycerol and the hydrogen bonding patterns formed by these solutions, which mimic the strong hydrogen bonding pattern seen in ice, yet crystallization does not occur.
Journal ArticleDOI
Dynamic relaxations and relaxation-property relationships in metallic glasses
Weihua Wang,Weihua Wang +1 more
TL;DR: A review of the state of the art of dynamic relaxation in metallic glassy system, as well as a comparison with other glassy systems, is presented in this paper, where the correlation between dynamic relaxation and various properties of MGs are established and summarized.
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Classification of secondary relaxation in glass-formers based on dynamic properties.
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