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Thermal and Optical Properties of Some Hydrogen-Bonded Liquid Crystal Mixtures

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Abstract

Phase transition properties of the mixtures of hydrogen-bonded nematic liquid crystals (HBLC) 4-hexylbenzoic acid (6BA), 4-(octyloxy)benzoic acid (8OBA), and 4-(decyloxy)benzoic acid (10OBA) have been investigated by means of differential scanning calorimetry (DSC) and polarize optic microscope (POM). The DSC and POM results clearly indicate the existence of smectic and nematic phase transitions in binary mixtures. The phase transition temperature values of 6BA/10OBA mixtures have clearly increased with increasing heating rate. The activation energies were calculated for the phase transitions of 6BA/10OBA liquid crystal (LC) mixture. The optical transmittance of these mixed hydrogen-bonded nematic liquid crystals was investigated in terms of temperature variations through electrooptic methods. The electrooptic experiments indicate that, while low in the nematic phase, the optical transmittance is very high at the nematic-isotropic phase transition. The transmitted light intensity values of 6BA/8OBA mixture are somewhat higher than those of other binary mixtures, 6BA/10OBA and 8OBA/10OBA, a result associated with the different alkyloxy chain lengths.

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Acknowledgments

The work has been supported by Kahramanmaras Sutcu Imam University Scientific Research Projects Coordination Department under Project Number: 2011/3-43 D.

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Authors and Affiliations

  1. Metallurgical and Materials Engineering, Batman University, Batman, Turkey

    Mustafa Okumuş

  2. Department of Physics, Kahramanmaras Sutcu Imam University, 46100, Kahramanmaras, Turkey

    Şükrü Özgan

  3. Faculty of Education, Department of Elementary Education, Aksaray University, Aksaray, Turkey

    Süleyman Yılmaz

Authors
  1. Mustafa Okumuş
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  2. Şükrü Özgan
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  3. Süleyman Yılmaz
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Correspondence to Mustafa Okumuş.

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Okumuş, M., Özgan, Ş. & Yılmaz, S. Thermal and Optical Properties of Some Hydrogen-Bonded Liquid Crystal Mixtures. Braz J Phys 44, 326–333 (2014). https://doi.org/10.1007/s13538-014-0217-7

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