Influences of nanoparticles and chain length on thermodynamic and electrical behavior of fluorine liquid crystals |
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Authors: | Ines Ben Amor Lotfi Saadaoui Abdulaziz N Alharbi Talal M Althagafi Taoufik Soltani |
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Institution: | 1. Université Tunis El Manar, Laboratoire de Physique de la Matière Molle et de la Modélisation Electromagnétique, 2092 Tunis;2. Physics Department, College of Science, Taif University, P. O. Box 11099, Taif 21944, Saudi Arabia |
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Abstract: | Hydrogen-bonded polar nematic liquid crystal series with the general formula nOBAF (n = 7—12) is studied. The mesomorphic characterization is demonstrated through differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The complexes with short alkyl chains (n=7, 8) present a wide nematic range and monotropic smectic F mesophase, whereas the longer alkyl chain (n=10—12) analogues show high melting and low clearing mesomorphic liquid crystals. The thermal range of the mesophase and the birefringence increase with chain length decreasing. Furthermore, the effect of the nanoparticles (LiNbO3) on the thermal and the electrical behavior of 8OBAF are investigated. The presence of LiNbO3 nanoparticles increases the conductivity and reduces the resistivity of the complex. |
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Keywords: | fluorine liquid crystal polar nematic ferroelectric nanoparticles thermal stability dielectric behavior |
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