Optical and thermodynamic studies on binary mixtures composed of two-isothiocyanato liquid crystals

Gilani, A. Ghanadzadeh; Khoshroo, N.; Mohammadi, M.; Kula, Przemysław; Rychłowicz, Natan

doi:10.1016/j.molliq.2022.120925

Cited by 3 publications

(1 citation statement)

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“…Liquid crystal mixtures are of great theoretical and practical interest. The phase behavior of these mixtures is far more complex compared with that of isotropic fluid mixtures, thus display systems generally use mixtures whose physical features are better suited for device applications than those of pure materials [1][2][3]. Liquid crystals' (LCs) electro optical response is greatly influenced by rotational viscosity, dielectric characteristics, and birefringence [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Mesomorphic Investigation of Binary Mixtures of Liquid Crystal Molecules with Different Mesogenic Architectonics

et al. 2023

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Different binary phase diagrams, made from two differently substituted three-rings azo/ester and azomethine/ester compounds of the same terminal alkoxy side chain of six carbons, as opposed to the other terminal polar substituent, which can either donate electrons or withdraw electrons including H. The thermal behavior of the prepared derivatives was investigated by differential scanning calorimetry and phases identified by polarized optical microscope. The first group of the binary mixtures was made from laterally F-substituted azo/ester derivatives and their laterally neat analogues. The second group of binary mixtures was made from laterally methoxy-substituted azomethine/ester derivatives and their laterally neat analogues. The final type of investigated phase diagrams was made from the laterally substituted azo and azomethine components bearing different lateral polar groups and different mesogenic moieties. Results were reviewed using phase diagrams that were produced and it was found that different mesomorphic characteristics were seen to depend on the mesogenic component as well as lateral and terminal polar groups. In all cases, these mixtures have been determined to have low melting-temperature eutectic compositions, while linear or negative deviation of nematic or smectic isotropic composition temperature dependence was observed.

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