Journal ArticleDOI
Study of the Cholesteric-to-Cholesteric Phase Transitions on the Lyotropic Mixture of KL/K2SO4/1-Undecanol/Water/Brucine Presenting the Cholesteric Biaxial Phase
TLDR
In this article, the quaternary mixture of potassium laurate (KL)/potassium sulfate (k2SO4)/1-undecanol (UndeOH)/water with brucine was used to construct the cholesteric helical arrangement.Abstract:
Lyotropic cholesteric liquid crystalline phases were prepared by doping the quaternary mixture of potassium laurate (KL)/potassium sulfate (K2SO4)/1-undecanol (UndeOH)/water with brucine. The phase diagram was constructed as a function of the brucine concentration. Three cholesteric phases were identified: cholesteric biaxial, calamitic uniaxial, and discotic uniaxial. It was observed that there is a critical brucine concentration (X* b ) to cholesterize the nematic host phase when the mixture is confined in a thin sample holder, below which the cholesteric helical arrangement is not achieved. The helical twisting power of brucine was calculated as 12.12 ± 0.40 μm−1.read more
Citations
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Properties of the broad-range nematic phase of a laterally linked H-shaped liquid crystal dimer
Young-Ki Kim,Randall Breckon,Saonti Chakraborty,Min Gao,Samuel Sprunt,James T. Gleeson,Robert J. Twieg,Antal Jakli,Oleg D. Lavrentovich +8 more
TL;DR: In this paper, a laterally linked H-shaped liquid crystal dimer has been synthesized and characterised, which exhibits interesting textural features at the scale of nanometers and at the macroscopic scales.
Journal ArticleDOI
Effect of micelle size and intermicellar distance on the chirality transfer in the intrinsic lyotropic cholesteric phases
TL;DR: In this article, the helical twisting powers of the cholesteric liquid crystalline phases were calculated as a function of concentrations of the L-enantiomers, and small-angle X-ray scattering (saxs) techniques were performed for determination of the structural differences between the racemic micelles and the chiral micells of the intrinsic Cholesteric phases, respectively.
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Contributions of intermicellar distance, micelle volume and screw angle to the temperature dependence of helical pitch in the intrinsic lyotropic cholesteric phases
TL;DR: In this article, two series of lyotropic quaternary liquid crystalline mixtures exhibiting intrinsic cholesteric phases were prepared from potassium N-dodecanoyl- l -alaninate (L-KDDA) and l -serinate, having different amphiphile concentrations.
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Non-uniform helix unwinding of cholesteric liquid crystals in cells with interdigitated electrodes.
Mariacristina Rumi,Vincent P. Tondiglia,Vincent P. Tondiglia,Lalgudi V. Natarajan,Lalgudi V. Natarajan,Timothy J. White,Timothy J. Bunning +6 more
TL;DR: Theoretical estimates of the expected shift in the reflection band gap based on the critical field for a given CLC material and the spatial variation of electric field in the cell are found to be in good agreement with the complex behavior observed experimentally.
Journal ArticleDOI
Computational method to determine the pitch length in cholesteric liquid crystals
G.M. Arcolezi,D.D. Luders,A.R. Sampaio,M. Simões,W.S. Braga,O.R. Santos,A. J. Palangana,N.M. Kimura +7 more
TL;DR: In this paper, the pitch length characterizes the cholesteric mesophase and, for this reason, the authors propose a computational method to determinate this parameter with high precision.
References
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Journal ArticleDOI
Observation of a Biaxial Nematic Phase in Potassium Laurate-1-Decanol-Water Mixtures
TL;DR: In this article, the ternary system potassium laurate-1-decanol-D${2}\mathrm{O}$ was studied over concentration ranges where nematic phases are likely to occur.
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The physics of liquid crystals, 2nd edition: P.G. De Gennes and J. Prost, Published in 1993 by Oxford University Press, Oxford, UK, pp 7,597 + xvi, ISBN: 0-19-852024
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Lyotropic nematics : molecular aggregation and susceptibilities
TL;DR: In this paper, the sign of 0394 was determined by optical observation of the textures in the presence of a magnetic field, and the results of an X-ray diffraction study of the aggregation of the amphiphilic molecules.
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Temperature behavior of the order-parameter invariants in the uniaxial and biaxial nematic phases of a lyotropic liquid crystal
Y. Galerne,J. P. Marcerou +1 more
TL;DR: In this paper, the differences between principal refractive indices have been measured, leading to a complete determination of the tensor order parameter in all the three phases, and the symmetric invariants of the order parameter have a linear dependence on temperature in good agreement with the prediction of the mean field model.