Stokes-Einstein diffusion of colloids in nematics
LOUDET, Jean-Christophe
Centre de recherches Paul Pascal [CRPP]
Centre de recherches Paul Pascal [CRPP]
Centre de recherches Paul Pascal [CRPP]
Centre de recherches Paul Pascal [CRPP]
MONDAIN-MONVAL, Olivier
Centre de recherches Paul Pascal [CRPP]
Centre de recherches Paul Pascal [CRPP]
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Centre de recherches Paul Pascal [CRPP]
Centre de recherches Paul Pascal [CRPP]
LOUDET, Jean-Christophe
Centre de recherches Paul Pascal [CRPP]
Centre de recherches Paul Pascal [CRPP]
Centre de recherches Paul Pascal [CRPP]
Centre de recherches Paul Pascal [CRPP]
MONDAIN-MONVAL, Olivier
Centre de recherches Paul Pascal [CRPP]
Centre de recherches Paul Pascal [CRPP]
< Réduire
Centre de recherches Paul Pascal [CRPP]
Centre de recherches Paul Pascal [CRPP]
Langue
en
Article de revue
Ce document a été publié dans
Physical Review E : Statistical, Nonlinear, and Soft Matter Physics. 2012-07-05, vol. 86, n° 1, p. 010401
American Physical Society
Résumé en anglais
We report the experimental observation of anisotropic diffusion of polystyrene particles immersed in a lyotropic liquid crystal with two different anchoring conditions. Diffusion is shown to obey the Stokes-Einstein law ...Lire la suite >
We report the experimental observation of anisotropic diffusion of polystyrene particles immersed in a lyotropic liquid crystal with two different anchoring conditions. Diffusion is shown to obey the Stokes-Einstein law for particle diameters ranging from 190 nm up to 2 μm. In the case of prolate micelles, the beads diffuse four times faster along the director than in perpendicular directions, D /D⊥ ≈ 4. In the theory part we present a perturbative approach to the Leslie-Ericksen equations and relate the diffusion coefficients to the Miesovicz viscosity parameters ηi .We provide explicit formulas for the cases of uniform director field and planar anchoring conditions which are then discussed in view of the data. As a general rule, we find that the inequalities ηb < ηa < ηc, satisfied by various liquid crystals of rodlike molecules, imply D > D⊥.< Réduire
Mots clés en anglais
colloids
diffusion
liquid crystals
nematic
brownian motion
Origine
Importé de halUnités de recherche