NON-INERTIAL ROTATIONAL DIFFUSION IN AXIALLY SYMMETRIC EXTERNAL POTENTIALS: APPLICATIONS TO ORIENTATIONAL RELAXATION OF MOLECULES IN FLUIDS AND LIQUID CRYSTALS

2012 ◽  
pp. 343-402
Keyword(s):  
Liquid Crystals ◽  
Rotational Diffusion ◽  
Axially Symmetric ◽  
Orientational Relaxation

Two-stage model for molecular orientational relaxation in liquid crystals

1990 ◽  
Vol 8 (5) ◽  
pp. 727-738 ◽  
Author(s):  
I. Dozov ◽  
S. Temkin ◽  
N. Kirov
Keyword(s):  
Liquid Crystals ◽  
Stage Model ◽  
Two Stage ◽  
Orientational Relaxation

Notizen: Comment on the Osipov-Terentjev Calculation of the Viscosity of Liquid Crystals

1992 ◽  
Vol 47 (4) ◽  
pp. 625-626 ◽  
Author(s):  
V. I. Stepanov
Keyword(s):  
Distribution Function ◽  
Liquid Crystals ◽  
Asymptotic Formula ◽  
Diffusion Approximation ◽  
Rotational Diffusion ◽  
Azimuthal Angle ◽  
Planck Equation ◽  
Viscosity Coefficient ◽  
Second Derivative ◽  
Rotational Viscosity

AbstractThe calculation of the viscosity of liquid crystals based on the rotational diffusion approximation recently reported by Osipov and Terentjev [1 a] is critically examined. It is shown that the main result of their treatment - the evaluation of the activational exponent - arises from the neglect of the second derivative of the distribution function with respect to the azimuthal angle in the Fokker-Planck equation. The correct asymptotic formula for the rotational viscosity coefficient is derived.

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