Low-frequency Raman scattering on different types of glass formers used to test predictions of mode-coupling theory

1994 ◽  
Vol 49 (21) ◽  
pp. 14967-14978 ◽  
Author(s):  
E. Rössler ◽  
A. P. Sokolov ◽  
A. Kisliuk ◽  
D. Quitmann
Keyword(s):  
Raman Scattering ◽  
Mode Coupling ◽  
Low Frequency ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Different Types

Dynamics in a Nonfragile Glass-Forming Liquid

1996 ◽  
Vol 455 ◽  
Author(s):  
B. Rufflé ◽  
S. Beaufils ◽  
J. Etrillard ◽  
J. Gallier ◽  
B. Toudic ◽  
...  
Keyword(s):  
Structural Relaxation ◽  
Mode Coupling ◽  
Low Frequency ◽  
Large Temperature ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Glass Forming ◽  
Real Change ◽  
Wide Energy ◽  
Fragile Glass

ABSTRACTThe dynamics of Na0.5Li0.5PO3 (Tg = 515 K, Tm = 749 K) a non fragile glass forming liquid has been investigated over a large temperature range (300 − 1000 K.) and in a wide energy window using various experimental techniques. The susceptibility spectra obtained by coherent neutron scattering and depolarized light scattering between 1 and 104 GHz show mainly two contributions: a low frequency vibrational peak, the so-called Boson peak and a quasielastic component, referred to the βfast process in the mode coupling theory (MCT).The data are discussed in relation to the mode coupling theory for the liquid glass transition. In particular, the temperature evolution of the susceptibility height in the βfast region is compatible with a crossover temperature Tc ∼ 620 K which is also deduced from a power law temperature dependence of the structural relaxation timescale. As a secondary βslow process, observed by 31P NMR, decouples from the structural relaxation timescale also below 600 K, a real change in the dynamics seems to occur around Tc ∼ 620 K = 1.2 Tg in this non fragile glass Conning liquid.

scholarly journals Hard discs under steady shear: comparison of Brownian dynamics simulations and mode coupling theory

2009 ◽  
Vol 367 (1909) ◽  
pp. 5033-5050 ◽  
Author(s):  
Oliver Henrich ◽  
Fabian Weysser ◽  
Michael E. Cates ◽  
Matthias Fuchs
Keyword(s):  
Brownian Dynamics ◽  
Mode Coupling ◽  
Transition Density ◽  
Two Dimensions ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Stationary Structure ◽  
Homogeneous Shear Flow ◽  
Dynamics Simulations ◽  
Brownian Dynamics Simulations

Brownian dynamics simulations of bidisperse hard discs moving in two dimensions in a given steady and homogeneous shear flow are presented close to and above the glass transition density. The stationary structure functions and stresses of shear-melted glass are compared quantitatively to parameter-free numerical calculations of monodisperse hard discs using mode coupling theory within the integration through transients framework. Theory qualitatively explains the properties of the yielding glass but quantitatively overestimates the shear-driven stresses and structural anisotropies.

Application of mode-coupling theory to solvation dynamics

1996 ◽  
Vol 54 (3) ◽  
pp. 2786-2796 ◽  
Author(s):  
Jangseok Ma ◽  
David Vanden Bout ◽  
Mark Berg
Keyword(s):  
Mode Coupling ◽  
Solvation Dynamics ◽  
Coupling Theory ◽  
Mode Coupling Theory

scholarly journals Mode-coupling analysis of residual stresses in colloidal glasses

Soft Matter ◽  
2014 ◽  
Vol 10 (27) ◽  
pp. 4822-4832 ◽  
Author(s):  
S. Fritschi ◽  
M. Fuchs ◽  
Th. Voigtmann
Keyword(s):  
Glass Transition ◽  
Shear Flow ◽  
Residual Stresses ◽  
Mode Coupling ◽  
Nonlinear Response ◽  
Density Fluctuations ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Coupling Analysis ◽  
Soft Glasses

Soft glasses produced after the cessation of shear flow exhibit persistent residual stresses. Mode coupling theory of the glass transition explains their history dependence in terms of nonequilibrium, nonlinear-response relaxation of density fluctuations.

scholarly journals Critical Slowing Down Exponents of Mode Coupling Theory

2012 ◽  
Vol 108 (8) ◽  
Author(s):  
F. Caltagirone ◽  
U. Ferrari ◽  
L. Leuzzi ◽  
G. Parisi ◽  
F. Ricci-Tersenghi ◽  
...  
Keyword(s):  
Mode Coupling ◽  
Critical Slowing Down ◽  
Coupling Theory ◽  
Mode Coupling Theory ◽  
Slowing Down
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