Concentration dependence of diffusion in liquid crystals. A new experimental approach

The impurity diffusion of a chiral species into an aligned nematic film displays a unique textural behavior. A dynamical analysis of this type of texture provides a new approach to study the concentration dependence of the diffusion coefficients in liquid crystals. By a simple variable rearrangement...

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Bibliographic Details
Published in:The Journal of chemical physics 1983-01, Vol.79 (3), p.1434-1438
Main Author: HAKEMI, H
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Diffusion and ionic conduction in liquids
Exact sciences and technology
Physics
Transport properties of condensed matter (nonelectronic)
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Summary:The impurity diffusion of a chiral species into an aligned nematic film displays a unique textural behavior. A dynamical analysis of this type of texture provides a new approach to study the concentration dependence of the diffusion coefficients in liquid crystals. By a simple variable rearrangement in the solution to the Fick’s Law, we evaluated the diffusion coefficients from the linear portion of the typical x2k/t - ln t plot at various measurable concentrations (pitches). The results showed an inverse law between the diffusion coefficient and the concentration of the diffusion profile. Extrapolation to zero concentration would give a good approximation to the self-diffusion coefficient of the nematic solvent.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.445904