New antiferroelectric liquid crystal for use in LCD
| Autor: | Anna Dłubacz, D. Dardas, M. Żurowska, Monika Marzec |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
antiferroelectric and ferroelectric liquid crystals 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention Condensed Matter::Materials Science Differential scanning calorimetry Liquid crystal law Phase (matter) Antiferroelectricity General Materials Science switching time Instrumentation Liquid-crystal display Birefringence Photoelastic modulator Condensed matter physics birefringence 021001 nanoscience & nanotechnology Ferroelectricity 0104 chemical sciences Condensed Matter::Soft Condensed Matter Crystallography tilt angle 0210 nano-technology photoelastic modulator spontaneous polarization |
| Popis: | In this work, the physical properties of newly synthesized liquid crystalline compound exhibiting two liquid crystalline phases (ferroelectric and antiferroelectric) were studied. Based on the results of differential scanning calorimetry, polarizing microscopy, and photoelastic modulator methods, the temperature dependences of spontaneous polarization, tilt angle, switching time, and birefringence in the ferroelectric, as well as antiferroelectric phases were determined. Furthermore, the influence of the external electric field on the liquid crystalline textures was studied and the phase sequences at heating and cooling were revealed. The temperature dependence of spontaneous polarization was analysed by means of Landau mean-field theory, and the critical parameter β obtained for ferroelectric liquid crystalline and isotropic liquid transition was 0.21 which is close to 0.25, the value characteristic for tri-critical point. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|