Volumetric study of the nematic-smectic-Ad-reentrant nematic phase transitions in the 80CB + 60CB mixture

Article Abstract:

Transitions near the nematic to smectic-Ad and the smectic-Ad to reentrant nematic phases in a mixture of pure (n-octyloxy)cyanobiphenyl (80CB) and homologous (n-hexyloxy)-cyanobiphenyl (60CB) have been studied through volumetric measurements. Results indicate that the phase transitions are continuous and the negative slope of the ratio of density with temperature is due to differences of the isobaric thermal expansion at the phase transitions.

Measurement, Biphenyl compounds, Biphenyls (Class of compounds), Phase rule and equilibrium, Phase equilibrium

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Spinodal temperatures at the nematic to isotropic phase transition from precise volumetric measurements

Article Abstract:

High-resolution molar volume data for 4-cyano-4-n-octylbiphenyl (8CB) are presented as a function of temperature near the nematic to isotropic (NI) phase transition. The data shows that the nematic to isotropic phase transition is much weaker than that predicted by the L-dG model and closer to that predicted by the tricritical hypothesis.

Temperature effects, Chemical properties, Phenyl compounds

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Chirality-biased point defects dynamics on a disclination line in a nematic liquid crystal

Article Abstract:

Chiral additives in the nematic liquid crystal can alter the dynamic of point defects while moving on a disclination line. The evolution of the system of defects in the presence of chiral additives provides a very direct proof of the existence of repulsive forces between the defects at large distances.

Science & research, Electronic components, not elsewhere classified, Other Electronic Component Manufacturing, Liquid Crystals, Chirality

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