[HTML][HTML] Universal properties of relaxation and diffusion in complex materials: Originating from fundamental physics with rich applications

KL Ngai - Progress in Materials Science, 2023 - Elsevier
Complex materials are composed of basic units which invariably interact with anharmonic
potentials. It is well known that the dynamics of systems with anharmonic interaction are …

Classification of secondary relaxation in glass-formers based on dynamic properties

KL Ngai, M Paluch - The Journal of chemical physics, 2004 - pubs.aip.org
It is generally agreed upon that the primary or the structural-relaxation involving
reorientation of larger angles and/or translation of sizeable distances is the most important …

Supercooled dynamics of glass-forming liquids and polymers under hydrostatic pressure

CM Roland, S Hensel-Bielowka… - Reports on Progress …, 2005 - iopscience.iop.org
An intriguing problem in condensed matter physics is understanding the glass transition, in
particular the dynamics in the equilibrium liquid close to vitrification. Recent advances have …

Correlation between dynamic fragility and glass transition temperature for different classes of glass forming liquids

Q Qin, GB McKenna - Journal of Non-Crystalline Solids, 2006 - Elsevier
Here we compile literature data for dynamic fragility m for six types of glass forming liquids:
polymers, small molecule organics, hydrogen bonding organics, inorganics, ionic and …

Relation between the activation energy of the Johari-Goldstein β relaxation and of glass formers

KL Ngai, S Capaccioli - Physical Review E, 2004 - APS
For glass-forming substances, we show that the ratio E β/RT g can be predicted
quantitatively from the coupling model. Here E β is the glassy state activation enthalpy of the …

Do theories of the glass transition, in which the structural relaxation time does not define the dispersion of the structural relaxation, need revision?

KL Ngai, R Casalini, S Capaccioli… - The Journal of …, 2005 - ACS Publications
Upon decreasing temperature or increasing pressure, a noncrystallizing liquid will vitrify; that
is, the structural relaxation time, τ α, becomes so long that the system cannot attain an …

Does the Arrhenius Temperature Dependence of the Johari-Goldstein Relaxation <?format ?>Persist above ?

M Paluch, CM Roland, S Pawlus, J Zioło, KL Ngai - Physical review letters, 2003 - APS
Dielectric spectra of the polyalcohols sorbitol and xylitol were measured under isobaric
pressures up to 1.8 GPa. At elevated pressure, the separation between the α and β …

Scaling the-relaxation time of supercooled fragile organic liquids

C Dreyfus, A Le Grand, J Gapinski, W Steffen… - The European Physical …, 2004 - Springer
It was shown recently 1 that the structural α-relaxation time τ of supercooled o-terphenyl
depends on a single control parameter Γ, which is the product of a function of density E(ρ) …

Universal behavior of dielectric responses of glass formers: Role of dipole-dipole interactions

M Paluch, J Knapik, Z Wojnarowska, A Grzybowski… - Physical Review Letters, 2016 - APS
From an exhaustive examination of the molecular dynamics in practically all van der Waals
molecular glass formers ever probed by dielectric spectroscopy, we found that the width of …

Isochronal temperature–pressure superpositioning of the α-relaxation in type-A glass formers

CM Roland, R Casalini, M Paluch - Chemical physics letters, 2003 - Elsevier
Dielectric spectra were obtained at ambient and elevated pressures for three 'type-A'glass
formers, which exhibit excess intensity on the high frequency side of the structural relaxation …