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

Soft Matter ◽  
2020 ◽  
Vol 16 (37) ◽  
pp. 8565-8576 ◽  
Author(s):  
Hend Baza ◽  
Taras Turiv ◽  
Bing-Xiang Li ◽  
Ruipeng Li ◽  
Benjamin M. Yavitt ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Disodium Cromoglycate

Shear causes a lyotropic chromonic liquid crystal to tumble and to form a cascade of textural instabilities with polydomain director structures, disclinations and periodic stripes.

scholarly journals DNA Origami Nano-Sheets and Nano-Rods Alter the Orientational Order in a Lyotropic Chromonic Liquid Crystal

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1695
Author(s):  
Bingru Zhang ◽  
Kevin Martens ◽  
Luisa Kneer ◽  
Timon Funck ◽  
Linh Nguyen ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Order Parameter ◽  
Liquid Crystalline ◽  
Orientational Order ◽  
Dna Origami ◽  
Nano Particles ◽  
Width Ratio ◽  
Disodium Cromoglycate ◽  
Orientational Order Parameter ◽  
Nano Rods

Rod-like and sheet-like nano-particles made of desoxyribonucleic acid (DNA) fabricated by the DNA origami method (base sequence-controlled self-organized folding of DNA) are dispersed in a lyotropic chromonic liquid crystal made of an aqueous solution of disodium cromoglycate. The respective liquid crystalline nanodispersions are doped with a dichroic fluorescent dye and their orientational order parameter is studied by means of polarized fluorescence spectroscopy. The presence of the nano-particles is found to slightly reduce the orientational order parameter of the nematic mesophase. Nano-rods with a large length/width ratio tend to preserve the orientational order, while more compact stiff nano-rods and especially nano-sheets reduce the order parameter to a larger extent. In spite of the difference between the sizes of the DNA nano-particles and the rod-like columnar aggregates forming the liquid crystal, a similarity between the shapes of the former and the latter seems to be better compatible with the orientational order of the liquid crystal.

Passive and active microrheology of a lyotropic chromonic nematic liquid crystal disodium cromoglycate

2019 ◽  
Vol 288 ◽  
pp. 111027 ◽  
Author(s):  
Ahlem Habibi ◽  
Christophe Blanc ◽  
Nadia Ben Mbarek ◽  
Taoufik Soltani
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Disodium Cromoglycate

Luminescence of ZnO Nanocrystals in C21H38NCl and C23H14O11Na2 Matrixes

2013 ◽  
Vol 200 ◽  
pp. 225-229
Author(s):  
Myroslava M. Omelchenko ◽  
Myron R. Panasyuk ◽  
Volodymyr B. Kapustianyk
Keyword(s):  
Liquid Crystal ◽  
Zno Nanoparticles ◽  
Cetylpyridinium Chloride ◽  
Visible Region ◽  
Disodium Cromoglycate ◽  
Photoluminescence Spectra ◽  
Zno Nanocrystals ◽  
Polymeric State ◽  
Radiation Centers ◽  
Liquid Crystal Materials

We report the data concerning investigations of photoluminescence spectra of ZnO nanoparticles in the matrixes of liquid crystal materials performed at T=290 K within a visible region. The mentuhflecioned spectra were obtained at polymeric state of Cetylpyridinium Chloride and Disodium Cromoglycate materials. The model of the radiation centers and mechanisms is discussed.

Elasticity, viscosity, and orientational fluctuations of a lyotropic chromonic nematic liquid crystal disodium cromoglycate

Soft Matter ◽  
2014 ◽  
Vol 10 (34) ◽  
pp. 6571-6581 ◽  
Author(s):  
Shuang Zhou ◽  
Krishna Neupane ◽  
Yuriy A. Nastishin ◽  
Alan R. Baldwin ◽  
Sergij V. Shiyanovskii ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Nematic Liquid Crystal ◽  
Nematic Phase ◽  
Elastic Moduli ◽  
Disodium Cromoglycate ◽  
Viscosity Coefficients ◽  
Self Assembled

Using dynamic light scattering, we study orientational fluctuation modes in the nematic phase of a self-assembled lyotropic chromonic liquid crystal disodium cromoglycate and measure the Frank elastic moduli and viscosity coefficients.

scholarly journals Correction: Shear-induced polydomain structures of nematic lyotropic chromonic liquid crystal disodium cromoglycate

Soft Matter ◽  
2021 ◽  
Author(s):  
Hend Baza ◽  
Taras Turiv ◽  
Bing-Xiang Li ◽  
Ruipeng Li ◽  
Benjamin M. Yavitt ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Soft Matter ◽  
Disodium Cromoglycate

Correction for ‘Shear-induced polydomain structures of nematic lyotropic chromonic liquid crystal disodium cromoglycate’ by Hend Baza et al., Soft Matter, 2020, 16, 8565–8576.

scholarly journals Effect of the degree of protonation of amino acid dopants in Chirality amplification in DSCG Lyotropic Nematic phases.

2021 ◽  
Author(s):  
Fernán Berride ◽  
Eduardo Troche-Pesqueira ◽  
Richard G. Weiss ◽  
Armando Navarro-Vázquez ◽  
María Magdalena Cid
Keyword(s):  
Liquid Crystal ◽  
Amino Acid ◽  
Nematic Phase ◽  
Lyotropic Liquid Crystal ◽  
Disodium Cromoglycate ◽  
Chiral Molecules ◽  
Cholesteric Phase ◽  
Nematic Phases ◽  
Helical Twisting Power ◽  
Acid Dopants

Disodium Cromoglycate (DSCG), a lyotropic liquid crystal in water, is shown to be an amplifier of chirality when doped with small chiral molecules. Here, we study the behaviour of the DSCG nematic phase in the presence of three aminoacids with different degrees of protonation: L-Alanine, L-Arginine·HCl and L-Arginine. The results demonstrate that the sign of the helicity of the doped nematic phase (i.e., a cholesteric phase) depends on the sign of the Helical Twisting Power of the dopant.

Freeze-fracture TEM of the helical smectic A* phase

1992 ◽  
Vol 50 (1) ◽  
pp. 278-279
Author(s):  
K.J. Ihn ◽  
R. Pindak ◽  
J. A. N. Zasadzinski
Keyword(s):  
Liquid Crystal ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Freeze Fracture ◽  
Smectic Phase ◽  
Layer Spacing ◽  
Screw Dislocations ◽  
Smectic A ◽  
Smectic Phases ◽  
Discrete Amount

A new liquid crystal (called the smectic-A* phase) that combines cholesteric twist and smectic layering was a surprise as smectic phases preclude twist distortions. However, the twist grain boundary (TGB) model of Renn and Lubensky predicted a defect-mediated smectic phase that incorporates cholesteric twist by a lattice of screw dislocations. The TGB model for the liquid crystal analog of the Abrikosov phase of superconductors consists of regularly spaced grain boundaries of screw dislocations, parallel to each other within the grain boundary, but rotated by a fixed angle with respect to adjacent grain boundaries. The dislocations divide the layers into blocks which rotate by a discrete amount, Δθ, given by the ratio of the layer spacing, d, to the distance between grain boundaries, lb; Δθ ≈ d/lb (Fig. 1).

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