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Dynamic Light Scattering Measurements of Azimuthal and Zenithal Anchoring of Nematic Liquid Crystals

Dynamic Light Scattering Measurements of Azimuthal and Zenithal Anchoring of Nematic Liquid Crystals

Mojca Vilfan, Alenka Mertelj, Martin Copic

Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Apr;65(4 Pt 1):041712.

PMID: 12005851

Abstract:

Dynamic light scattering is used to obtain the anchoring energy coefficients of nematic liquid crystal (4-n-pentyl-4(')-cyanobiphenyl) on rubbed nylon and photoactive poly-(vinyl-cinnamate). The anchoring coefficients are determined by measuring the relaxation time of the fundamental director fluctuation mode in a homogeneously aligned wedge cell as a function of cell thickness. The method is nonperturbative as no external torque is applied to the liquid crystal during the measurement. We show that by using two different scattering geometries, both azimuthal and zenithal anchoring energy coefficients can be measured on the same sample. The obtained zenithal anchoring coefficient is found to be, in contrast to previously reported results, approximately only two times larger than the azimuthal one. The effect of higher order fluctuation modes on the detected autocorrelation function is in good agreement with numerical calculations.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP9050060	Poly(vinyl cinnamate)		9050-06-0	Price

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