Optical characterization of the nematic lyotropic chromonic liquid crystals: light absorption, birefringence, and scalar order parameter.

  title={Optical characterization of the nematic lyotropic chromonic liquid crystals: light absorption, birefringence, and scalar order parameter.},
  author={Yu. A. Nastishin and H. Liu and Tod Schneider and V. G. Nazarenko and R. M. Vasyuta and S V Shiyanovskii and Oleg D. Lavrentovich},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  volume={72 4 Pt 1},
We report on the optical properties of the nematic (N) phase formed by lyotropic chromonic liquid crystals (LCLCs) in well aligned planar samples. LCLCs belong to a broad class of materials formed by one-dimensional molecular self-assembly and are similar to other systems such as "living polymers" and "wormlike micelles." We study three water soluble LCLC forming materials: disodium chromoglycate, a derivative of indanthrone called Blue 27, and a derivative of perylene called Violet 20. The… 

Orientation of chromonic liquid crystals by topographic linear channels: multi-stable alignment and tactoid structure

We study the alignment behaviour of the chromonic liquid crystal phases of sunset yellow (SSY)/water, disodium cromoglycate (DSCG)/water and their mixtures when confined in cells by polymer films

Polarizing Properties of Functional Optical Films Based on Lyotropic Chromonic Liquid Crystals

We report results of the optical characterization of dried thin films obtained from the well-aligned nematic phase of a lyotropic chromonic liquid crystal (LCLC) by two different deposition

Shear-induced polydomain structures of nematic lyotropic chromonic liquid crystal disodium cromoglycate.

The shear-induced transformations of the nematic LCLC, formed by 14 wt% water dispersion of disodium cromoglycate, are explained by the balance of the elastic and viscous energies.

Molecular Ordering Behavior of Lyotropic Chromonic Liquid Crystals on a Polyimide Alignment Layer.

Coating-type polarizing films with high dichroic ratio (DR) and polarization efficiency in the visible region were fabricated using a solution of ternary lyotropic chromonic liquid crystals and it was found that ordering direction was determined by shearing direction of the LCLC solution coating whereas the ordering direction at low LCLCs concentrations was governed by the dielectric anisotropy effect from PI rubbing direction.

Liquid crystal textures and optical characterization of a dye- doped nematic for generating vector beams

In the present work, liquid-crystal (LC) textures with non-uniform directorfield configurations and azimuthal singularities are considered from the viewpoint of their applications for generating

Orthogonal Liquid Crystal Alignment Layer: Templating Speed-Dependent Orientation of Chromonic Liquid Crystals.

An orthogonally patterned film is fabricated that can be used as an alignment layer for guiding rodlike liquid crystals (LCs) to generate both twisted and planar alignments simultaneously and can provide a facile method to form multidirectional orientation of soft materials and biomaterials in a process of simple shearing and evaporation.

Lyotropic chromonic liquid crystals as materials for optical and biosensing applications

Lyotropic chromonic liquid crystals (LCLCs) are formed by molecules with rigid polyaromatic cores and ionic groups at the periphery that form aggregates while in water. Most of the LCLCs are not

Hierarchical organization in liquid crystal-in-liquid crystal emulsions.

LC-in-LC emulsions define a new class of hierarchically ordered soft matter in which both thermotropic and lyotropic LCs are coupled in their ordering.

Anisotropic light absorption, refractive indices, and orientational order parameter of unidirectionally aligned columnar liquid crystal films.

From the polarized absorption data of the columnar liquid crystal films, the light wavelength dependence of the birefringence and of the real and imaginary parts (refractive index and extinction coefficient, respectively) of the anisotropic optical indices are determined over the whole visible range.

Chromonic liquid crystalline phases

Chromonic systems are lyotropic mesophases formed by soluble aromatic compounds. The basic structural units in these systems are stacks of molecules (rather than individual molecules or micellar



Pretransitional fluctuations in the isotropic phase of a lyotropic chromonic liquid crystal.

A dramatic increase of the shear viscosity near the transition to the nematic phase, the fact which correlates with the idea of growing supramolecular aggregates and the size of the cromolyn aggregates is observed.

Surface-assisted photoalignment control of lyotropic liquid crystals. Part 1. Characterisation and photoalignment of aqueous solutions of a water-soluble dye as lyotropic liquid crystals

The surface-mediated alignment control of a lyotropic liquid crystal (LLC) of aqueous solutions of a water-soluble dye, C. I. Direct blue 67, by using thin films of poly(4-phenylazophenyl

Surface-assisted photoalignment control of lyotropic liquid crystals. Part 2. Photopatterning of aqueous solutions of a water-soluble anti-asthmatic drug as lyotropic liquid crystals

The photocontrol of the alignment of aqueous solutions of an anti-asthmatic drug, disodium chromoglycate (DSCG), as a lyotropic liquid crystal (LLC), was performed by irradiation of a thin film of

Self-Assembled Monolayers and Multilayered Stacks of Lyotropic Chromonic Liquid Crystalline Dyes with In-Plane Orientational Order

A simple method to create large areas of in-plane oriented molecular mono- and multilayers is presented. The method is based on layer-by-layer adsorption of polyions and a lyotropic chromonic

Isotropic–nematic phase transitions in aqueous solutions of weakly charged, rodlike polyelectrolytes

The transition from an isotropic to a nematic liquid crystal phase in a solution of charged rodlike molecules is studied under conditions in which the characteristic interaction energy between two

Oriented monolayers prepared from lyotropic chromonic liquid crystal.

Atomic force microscopy and X-ray photoelectron spectroscopy of the dried film reveal that the LCLC molecules adsorb at the charged substrate preserving ordered aggregates of elongated shape characteristic of the nematic phase in the aqueous solution.

Aggregation behavior and chromonic liquid crystal properties of an anionic monoazo dye.

The x-ray results demonstrate that aggregation involves pi-pi stacking of the molecules into columns, with the columns undergoing a phase transition to an orientationally ordered chromonic liquid crystal phase at high dye concentration.

Isotropic–nematic phase behavior of length-polydisperse hard rods

The isotropic–nematic phase behavior of length-polydisperse hard rods with arbitrary length distributions is calculated. Within a numerical treatment of the polydisperse Onsager model using the

Optical and surface morphological properties of polarizing films fabricated from a chromonic dye by the photoalignment technique.

The inherent chromonic lyotropic liquid crystalline properties of a dye have been manipulated to fabricate multi-axial micropolarizing thin films by means of the photoalignment technique, resulting in solid polarizing dye layers that exhibit very a high contrast ratio and degree of polarization in the region of visible light.

Molecularly ordered low molecular weight azobenzene dyes and polycation alternate multilayer films : Aggregation, layer order, and photoalignment

Although the incorporation of small-molecule azobenzene dyes in polymer thin films has been investigated in the past, the application of the layer-by-layer adsorption technique has enabled