| Revista: | Brazilian journal of physics |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000379521 |
| ISSN: | 0103-9733 |
| Autores: | Okumus, Mustafa1 Ozgan, Sukru2 Yilmaz, Suleyman3 |
| Instituciones: | 1Batman University, Metallurgical and Materials Engineering, Batman. Turquía 2Ozgan Kahramanmaras Sutcu Imam University, Department of Physics, Kahramanmaras. Turquía 3Aksaray University, Faculty of Education, Aksaray. Turquía |
| Año: | 2014 |
| Periodo: | Ago |
| Volumen: | 44 |
| Número: | 4 |
| Paginación: | 326-333 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, analítico |
| Resumen en inglés | 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 |
| Disciplinas: | Física y astronomía |
| Palabras clave: | Física de materia condensada, Cristales líquidos, Propiedades ópticas, Propiedades termodinámicas |
| Keyword: | Physics and astronomy, Condensed matter physics, Liquid crystals, Optical properties, Thermodynamic properties |
| Texto completo: | Texto completo (Ver PDF) |
