Enhancement of photorefractivity in the isotropic phase of polymer liquid crystals

Article Abstract:

Two-beam coupling experiments were carried out in examining the photorefractivity of the isotropic phase of polymer liquid crystals with 4-nitrobenzylideneaniline and cyanobiphenyl moieties. The polymers NBA6, NBA11, NBA3 and Ac-NBA6 were used in the study. Results indicated that a diffraction efficiency of 65% is obtained when an external electric field of 37 V/micrometer was applied in the isotropic phase of the polymer liquid crystal. The photorefractivity was higher in the isotropic phase of the liquid crystalline polymers than that for amorphous polymers.

Evaluation, Polymers, Optical properties, Photorefractive materials

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The alignment of lyotropic liquid crystals formed by hexadecyltrimethylammonium bromide in D2O in a magnetic field

Article Abstract:

2H nuclear magnetic resonance spectroscopy was used in studying the alignment of lyotropic liquid crystals formed by hexadecyltrimethylammonium bromide (CTAB) with D2O. CTAB is a cationic surfactant that forms micelles in aqueous solutions and in organic solvents above the critical micelle concentration. Results indicated that alignment at higher concentrations did not occur because the viscosity was high. The micelles were oriented perpendicular to the magnetic field when sodium salicylate (NaSal) was added at equal molar concentrations of CTAB and NaSal.

Surface active agents, Micelles

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Small-angle scattering from hexagonal liquid crystals

Article Abstract:

The scattering behavior of two-dimensional hexagonal liquid crystals with micellar cylinders is discussed as a building unit. The generalized indirect Fourier transformation (GIFT) method has provided the parameters of the structure factor model and the pair distance distribution function of the cylinders and the deconvolution (DECON) method is used to calculate the radial contrast profile of the cylinders from the pair distance distribution function that is obtained by the GIFT method.

Electronic components, not elsewhere classified, Other Electronic Component Manufacturing, Liquid Crystals, Fourier transformations, Fourier transforms

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