Tracer diffusion at the glass transition

1990 ◽  
Vol 23 (6) ◽  
pp. 1600-1610 ◽  
Author(s):  
Dietmar Ehlich ◽  
Hans Sillescu
Keyword(s):  
Glass Transition ◽  
Tracer Diffusion

Molecular Tracer Diffusion in Nondilute Polymer Solutions: Universal Master Curve and Glass Transition Effects

2015 ◽  
Vol 48 (24) ◽  
pp. 8907-8912 ◽  
Author(s):  
Apostolos Vagias ◽  
Jennifer Schultze ◽  
Mikheil Doroshenko ◽  
Kaloian Koynov ◽  
Hans-Jürgen Butt ◽  
...  
Keyword(s):  
Glass Transition ◽  
Master Curve ◽  
Polymer Solutions ◽  
Tracer Diffusion ◽  
Molecular Tracer ◽  
Transition Effects

Tracer diffusion measurement in polymer solutions near the glass transition by forced rayleigh scattering

AIChE Journal ◽  
1987 ◽  
Vol 33 (4) ◽  
pp. 573-582 ◽  
Author(s):  
W. J. Huang ◽  
T. S. Frick ◽  
M. R. Landry ◽  
J. A. Lee ◽  
T. P. Lodge ◽  
...  
Keyword(s):  
Glass Transition ◽  
Rayleigh Scattering ◽  
Polymer Solutions ◽  
Tracer Diffusion ◽  
Diffusion Measurement

Theory of tracer diffusion in concentrated hard-sphere suspensions

2019 ◽  
Vol 870 ◽  
pp. 1105-1126 ◽  
Author(s):  
S. S. L. Peppin
Keyword(s):  
Glass Transition ◽  
Hard Sphere ◽  
Volume Fraction ◽  
Pore Space ◽  
Particle Volume Fraction ◽  
Tracer Diffusion ◽  
Tracer Diffusivity ◽  
Particle Volume ◽  
Cross Diffusion ◽  
Sphere Suspensions

A phenomenological theory of diffusion and cross-diffusion of tracer particles in concentrated hard-sphere suspensions is developed. Expressions for the diffusion coefficients as functions of the host particle volume fraction are obtained up to the close-packing limit. In concentrated systems the tracer diffusivity decreases because of the reduced pore space available for diffusion. The tracer diffusivity can be modelled by a Stokes–Einstein equation with an effective viscosity that depends on the pore size. Tracer diffusion and segregation during sedimentation cease at a critical trapping volume fraction corresponding to a tracer glass transition. The tracer cross-diffusion coefficient, however, increases near the glass transition and diverges in the close-packed limit.

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