Cyclic voltammetric and phase transition studies of some liquid crystalline materials

1986 ◽  
pp. 1121 ◽  
Author(s):  
Shunsuke Takenaka ◽  
Toshiro Hirohata ◽  
Ichiro Shimohara ◽  
Shigekazu Kusabayashi
Keyword(s):  
Phase Transition ◽  
Liquid Crystalline ◽  
Cyclic Voltammetric ◽  
Crystalline Materials ◽  
Liquid Crystalline Materials ◽  
Transition Studies

The Dynamic Properites of Confined Antiferroelectric Liquid Crystal Investigated By Photon Correlation Spectroscopy

1999 ◽  
Vol 559 ◽  
Author(s):  
Yu.P. Panarin ◽  
C. Rosenblatr ◽  
F.M. Aliev
Keyword(s):  
Phase Transition ◽  
Porous Media ◽  
Liquid Crystalline ◽  
Photon Correlation Spectroscopy ◽  
Correlation Spectroscopy ◽  
Photon Correlation ◽  
Crystalline Materials ◽  
Liquid Crystalline Phases ◽  
Liquid Crystalline Materials ◽  
Structural Aspects

ABSTRACTDynamic light scattering was used to examine ferrielectric liquid crystalline phases in porous media. Whereas in larger pores (200 Å) ferrielectric phases were observed, they were not found in the smallest pores (200 Å). Additionally, the temperatures of SmC - SmA phase transition were found to be suppressed in the pores relative to bulk, while SmCA - SmCγ phase transition is not affected by the confinement. These observations have been explained by the structural aspects of antiferroelectric liquid crystalline materials in a confined geometry and show the importance of long range electrostatic interaction for existence of ferrielectric phases.

scholarly journals Laser triggered phase transition in photothermal liquid crystals

2017 ◽  
Vol 53 (47) ◽  
pp. 6339-6342 ◽  
Author(s):  
Mathieu Ciancone ◽  
Franck Camerel
Keyword(s):  
Phase Transition ◽  
Liquid Crystalline ◽  
Room Temperature ◽  
High Temperature Phase ◽  
Pure Liquid ◽  
Temperature Phase ◽  
Spatial Control ◽  
Crystalline Materials ◽  
Temperature Phase Transition ◽  
Liquid Crystalline Materials

Laser irradiation allows rapid high temperature phase transition directly from room temperature in pure liquid crystalline materials built around photothermal cores with a high spatial control and responsivness.

scholarly journals PHASE TRANSITION STUDIES OF CHOLESTERYL PALMITATE, CHOLESTERYL DECANOATE AND THEIR MIXTURES USING DIELECTRIC, EPR AND DTA TECHNIQUES

2021 ◽  
Vol 9 (11) ◽  
pp. 210-223
Author(s):  
Sanjai Misra ◽  
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Order Parameter ◽  
Liquid Crystalline ◽  
Paramagnetic Resonance ◽  
Crystalline Materials ◽  
Phase Transition Temperatures ◽  
Cholesteryl Palmitate ◽  
Liquid Crystalline Materials ◽  
Electron Paramagnetic

The phase transition of two liquid crystalline materials, namely cholesteryl palmitate and cholesteryl decanoate and their mixtures (by weight)are studied using dielectric, Electron paramagnetic resonance (EPR) and differential thermal analysis (DTA) techniques. From the dielectric measurements, the phase transition temperatures were determined from the discontinuities in the curve between dielectric constant and temperatures for all the samples investigated. Further, since mixing of two liquid crystals modifies the transition of phases, the measurements were carried out on the mixtures of the two liquid crystals. Order parameter for each sample was calculated at varying temperatures by measuring the hyperfine splitting of three line EPR spectrums. The discontinuities in the curve between order parameter and the temperature again indicated the phase transition of the liquid crystals and their mixtures. A DTA study on these samples was also carried out in order to probe further their transitional behaviour. The DTA records of both the liquid crystals and their mixtures support the transition behaviour observed from the dielectric and EPR measurements.

On resolving fine periodic microstructures in the optical microscope

1989 ◽  
Vol 47 ◽  
pp. 364-365
Author(s):  
W.S. Putnam ◽  
C. Viney
Keyword(s):  
Liquid Crystalline ◽  
Numerical Aperture ◽  
Polarized Light ◽  
Normal Incidence ◽  
Optical Microscope ◽  
Angle Of Incidence ◽  
Resolution Limit ◽  
Crystalline Materials ◽  
Periodic Microstructures ◽  
Liquid Crystalline Materials

Many sheared liquid crystalline materials (fibers, films and moldings) exhibit a fine banded microstructure when observed in the polarized light microscope. In some cases, for example Kevlar® fiber, the periodicity is close to the resolution limit of even the highest numerical aperture objectives. The periodic microstructure reflects a non-uniform alignment of the constituent molecules, and consequently is an indication that the mechanical properties will be less than optimal. Thus it is necessary to obtain quality micrographs for characterization, which in turn requires that fine detail should contribute significantly to image formation.It is textbook knowledge that the resolution achievable with a given microscope objective (numerical aperture NA) and a given wavelength of light (λ) increases as the angle of incidence of light at the specimen surface is increased. Stated in terms of the Abbe resolution criterion, resolution improves from λ/NA to λ/2NA with increasing departure from normal incidence.

Designing Chemically Selective Liquid Crystalline Materials that Respond to Oxidizing Gases

2021 ◽  
Author(s):  
Nanqi Bao ◽  
Jake Gold ◽  
Tibor Szilvasi ◽  
Huaizhe Yu ◽  
Robert Twieg ◽  
...  
Keyword(s):  
Computational Methods ◽  
First Principles ◽  
Liquid Crystalline ◽  
Soft Materials ◽  
Crystalline Materials ◽  
Liquid Crystalline Materials ◽  
Chemically Selective ◽  
Kinetics Of

Computational methods can provide first-principles insights into the thermochemistry and kinetics of reactions at interfaces, but this capability has not been widely leveraged to design soft materials that respond selectively...

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