Research Article
Year 2019,
Volume: 22 - Special Issue, 34 - 40, 29.11.2019
Abstract
The nematic liquid crystals are very important
materials in the production of display systems and many technological
applications. It is necessary to investigate the physical and electrical
properties of the nematic liquid crystals. Voltage dependence of impedance,
modulus and loss tangent of 6CB, 8CB and E7 nematic liquid crystals were
investigated at 0-20V DC volts range, room temperature and 1 kHz frequency. The
real electric modulus of the 6CB and 8CB samples shows a small increase due to
the increase in voltage and 8CB real modulus values are bigger than from 6CB
real modulus values. The real modulus of the E7 has a damping of around 7 volt and is small at high voltages. The imaginary
electric modulus of the samples is decrease with voltage increase. The loss
tangent values of the 6CB and 8CB samples decreases after a certain voltage
value. Absolute impedance of the 6CB, 8CB samples have wavy behavior and the
absolute impedance of E7 approaches zero at all voltage values.
Keywords
References
- Bahadur, B. (1990). Liquid crystals: applications and uses (Vol. 1): World scientific.
- Chen, A. G., & Brady, D. J. (1992). Real-time holography in azo-dye-doped liquid crystals. Optics letters, 17(6), 441-443.
- Eskalen, H., Kerli, S., & Özğan, Ş. (2017). Hydrothermally produced cobalt oxide nanostructures at different temperatures and effect on phase transition temperature and threshold voltage of nematic liquid crystal host. Cobalt, InTech, 71-85.
- Eskalen, H., Okumuş, M., & Özğan, Ş. (2019). Electro-optical, thermal and dielectric properties of ternary mixture of E7/6CB/6BA liquid crystal mixture complex. Optik, 187, 223-229.
- Eskalen, H., & Özğan, Ş. (2014). Altın Nanoparçacıklarla Katkılandırılan Nematik Sıvı Kristallerin İncelenmesi. Düzce Üniversitesi Bilim ve Teknoloji Dergisi, 2(2), 407-414.
- Eskalen, H., Özğan, Ş., Alver, Ü., & Kerli, S. (2015). Electro-Optical Properties of Liquid Crystals Composite with Zinc Oxide Nanoparticles. Acta Physica Polonica, A., 127(3).
- Eskalen, H., Özğan, Ş., Okumuş, M., & Kerl, S. (2019). Thermal and Electro-optical Properties of Graphene Oxide/Dye-Doped Nematic Liquid Crystal. Brazilian Journal of Physics, 49(3), 341-347.
- Gupta, R. K., & Kumar, S. (2019). Effect of functionalised silver nanoparticle on the elastic constants and ionic transport of a nematic liquid crystal. Liquid Crystals, 1-9.
- Lee, W., Gau, J.-S., & Chen, H.-Y. (2005). Electro-optical properties of planar nematic cells impregnated with carbon nanosolids. Applied Physics B, 81(2-3), 171-175. Mahalingam, T., Venkatachalam, T., Jayaprakasam, R., & Vijayakumar, V. (2016). Optical, thermal studies on binary and ternary hydrogen-bonded liquid crystal complexes. Brazilian Journal of Physics, 46(3), 273-281.
- Matharu, A. S., Jeeva, S., & Ramanujam, P. (2007). Liquid crystals for holographic optical data storage. Chemical Society Reviews, 36(12), 1868-1880.
- Nafees, A., Kalita, G., & Sinha, A. (2019). Effect of titanium dioxide nanoparticles on the dielectric and electro-optical properties of bent-core liquid crystals. Journal of Molecular Liquids, 274, 592-597.
- Nimmy, J. V., Cherumannil Karumuthil, S., & Varghese, S. (2019). Nano P (VDF-TrFE) doped polyimide alignment layers for twisted nematic liquid crystal devices. Liquid Crystals, 1-6.
- Okumus, M. (2013). Investigation of the phase transition and absorption properties of liquid crystal hexylcyanobiphenyl/octylcyanobiphenyl mixtures. Asian Journal of Chemistry, 25(7), 3879. Okumuş, M., Eskalen, H., Sünkür, M., & Özğan, Ş. (2019). Mesogenic properties of PAA/6BA binary liquid crystal complexes. Journal of Molecular Structure, 1178, 428-435. Okumuş, M., Özğan, Ş., Kırık, İ., & Kerli, S. (2016). Thermal and optical characterization of liquid crystal 4′-hexyl-4-biphenylcarbonitrile/4-hexylbenzoic acid mixtures. Journal of Molecular Structure, 1120, 150-155. Okumuş, M., Özğan, Ş., & Yılmaz, S. (2014). Thermal and optical properties of some hydrogen-bonded liquid crystal mixtures. Brazilian Journal of Physics, 44(4), 326-333. Özğan, Ş. Investigating of dielectric anisotropy and birefringence of binary liquid crystal mixtures. International Journal of Chemistry and Technology, 1(1), 1-6.
- Özğan, Ş., Eskalen, H., & Tapkıranlı, Y. (2018). Thermal and electro-optic properties of graphene oxide-doped hexylcyanobiphenyl liquid crystal. Journal of Theoretical and Applied Physics, 12(3), 169-176.
- Özğan, S., & Keskin, M. (1995). A Theory of Melting of Molecular Crystals III. The Liquid Crystalline Phase. Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 270(1), 147-157.
- Özğan, Ş., & Okumuş, M. (2011). Thermal and spectrophotometric analysis of liquid crystal 8CB/8OCB mixtures. Brazilian Journal of Physics, 41(2-3), 118.
- Ozgan, S., Yazici, M., & Ates, K. (2011). Conductance and Dielectric Anisotropy Properties of 4'-Hexyl-4-biphenylcarbonitrile and 4'-Octyloxy-4-biphenylcarbonitrile Liquid Crystals and Their Composite. Asian Journal of Chemistry, 23(7), 3247-3251.
- Sharma, A., Malik, P., Dhar, R., & Kumar, P. (2019). Improvement in electro-optical and dielectric characteristics of ZnO nanoparticles dispersed in a nematic liquid crystal mixture. Bulletin of Materials Science, 42(5), 215.
- Shen, Y., & Dierking, I. (2019). Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience. Applied Sciences, 9(12), 2512. Shiju, E., Arun, R., Varma, M. R., Chandrasekharan, K., Sandhyarani, N., & Varghese, S. (2017). Effect of ferroelectric nanoparticles in the alignment layer of twisted nematic liquid crystal display. Optical Materials, 67, 7-13.
- Vill, V. (1992). Early history of liquid crystalline compounds. Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 213(1), 67-71.
- Wulf, A. (1976). Difficulties with the Maier–Saupe theory of liquid crystals. The Journal of Chemical Physics, 64(1), 104-109.
- Ye, L., Liu, B., Li, F., Feng, Y., Cui, Y., & Lu, Y. (2016). The influence of Ag nanoparticles on random laser from dye-doped nematic liquid crystals. Laser Physics Letters, 13(10), 105001.
Year 2019,
Volume: 22 - Special Issue, 34 - 40, 29.11.2019
Abstract
Nematik sıvı kristaller, gösterge sistemleri
üretiminde ve birçok teknolojik uygulamalarda çok önemli malzemelerdir. Nematik
sıvı kristallerin fiziksel ve elektriksel özelliklerinin araştırılması gerekir.
6CB, 8CB ve E7 nematik sıvı kristallerin empedans, modül ve kayıp tanjantı, oda
sıcaklığında ve 1 kHz frekansında, 0-20V
DC volt aralığında gerilime bağlı olarak incelenmiştir. 6CB ve 8CB numunelerin
gerçek elektrik modülü gerilimdeki artıştan dolayı küçük bir artış gösterir ve 8CB
gerçek modül değerleri 6CB gerçek modül değerlerinden daha büyüktür. E7'nin gerçek
modülü yaklaşık 7 voltta bir düşüşe sahiptir ve yüksek voltajlarda küçüktür.
Numunelerin sanal elektrik modülü voltaj artışı ile azalır. 6CB ve 8CB
numunelerin kayıp tanjant değerleri, belirli bir voltaj değerinden sonra
azalmaktadır. 6CB ve 8CB numunelerin mutlak empedansı dalgalı davranışa
sahiptir ve E7 nin mutlak empedans değeri bütün voltaj değerlerinde sıfıra yaklaşmaktadır.
Keywords
References
- Bahadur, B. (1990). Liquid crystals: applications and uses (Vol. 1): World scientific.
- Chen, A. G., & Brady, D. J. (1992). Real-time holography in azo-dye-doped liquid crystals. Optics letters, 17(6), 441-443.
- Eskalen, H., Kerli, S., & Özğan, Ş. (2017). Hydrothermally produced cobalt oxide nanostructures at different temperatures and effect on phase transition temperature and threshold voltage of nematic liquid crystal host. Cobalt, InTech, 71-85.
- Eskalen, H., Okumuş, M., & Özğan, Ş. (2019). Electro-optical, thermal and dielectric properties of ternary mixture of E7/6CB/6BA liquid crystal mixture complex. Optik, 187, 223-229.
- Eskalen, H., & Özğan, Ş. (2014). Altın Nanoparçacıklarla Katkılandırılan Nematik Sıvı Kristallerin İncelenmesi. Düzce Üniversitesi Bilim ve Teknoloji Dergisi, 2(2), 407-414.
- Eskalen, H., Özğan, Ş., Alver, Ü., & Kerli, S. (2015). Electro-Optical Properties of Liquid Crystals Composite with Zinc Oxide Nanoparticles. Acta Physica Polonica, A., 127(3).
- Eskalen, H., Özğan, Ş., Okumuş, M., & Kerl, S. (2019). Thermal and Electro-optical Properties of Graphene Oxide/Dye-Doped Nematic Liquid Crystal. Brazilian Journal of Physics, 49(3), 341-347.
- Gupta, R. K., & Kumar, S. (2019). Effect of functionalised silver nanoparticle on the elastic constants and ionic transport of a nematic liquid crystal. Liquid Crystals, 1-9.
- Lee, W., Gau, J.-S., & Chen, H.-Y. (2005). Electro-optical properties of planar nematic cells impregnated with carbon nanosolids. Applied Physics B, 81(2-3), 171-175. Mahalingam, T., Venkatachalam, T., Jayaprakasam, R., & Vijayakumar, V. (2016). Optical, thermal studies on binary and ternary hydrogen-bonded liquid crystal complexes. Brazilian Journal of Physics, 46(3), 273-281.
- Matharu, A. S., Jeeva, S., & Ramanujam, P. (2007). Liquid crystals for holographic optical data storage. Chemical Society Reviews, 36(12), 1868-1880.
- Nafees, A., Kalita, G., & Sinha, A. (2019). Effect of titanium dioxide nanoparticles on the dielectric and electro-optical properties of bent-core liquid crystals. Journal of Molecular Liquids, 274, 592-597.
- Nimmy, J. V., Cherumannil Karumuthil, S., & Varghese, S. (2019). Nano P (VDF-TrFE) doped polyimide alignment layers for twisted nematic liquid crystal devices. Liquid Crystals, 1-6.
- Okumus, M. (2013). Investigation of the phase transition and absorption properties of liquid crystal hexylcyanobiphenyl/octylcyanobiphenyl mixtures. Asian Journal of Chemistry, 25(7), 3879. Okumuş, M., Eskalen, H., Sünkür, M., & Özğan, Ş. (2019). Mesogenic properties of PAA/6BA binary liquid crystal complexes. Journal of Molecular Structure, 1178, 428-435. Okumuş, M., Özğan, Ş., Kırık, İ., & Kerli, S. (2016). Thermal and optical characterization of liquid crystal 4′-hexyl-4-biphenylcarbonitrile/4-hexylbenzoic acid mixtures. Journal of Molecular Structure, 1120, 150-155. Okumuş, M., Özğan, Ş., & Yılmaz, S. (2014). Thermal and optical properties of some hydrogen-bonded liquid crystal mixtures. Brazilian Journal of Physics, 44(4), 326-333. Özğan, Ş. Investigating of dielectric anisotropy and birefringence of binary liquid crystal mixtures. International Journal of Chemistry and Technology, 1(1), 1-6.
- Özğan, Ş., Eskalen, H., & Tapkıranlı, Y. (2018). Thermal and electro-optic properties of graphene oxide-doped hexylcyanobiphenyl liquid crystal. Journal of Theoretical and Applied Physics, 12(3), 169-176.
- Özğan, S., & Keskin, M. (1995). A Theory of Melting of Molecular Crystals III. The Liquid Crystalline Phase. Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 270(1), 147-157.
- Özğan, Ş., & Okumuş, M. (2011). Thermal and spectrophotometric analysis of liquid crystal 8CB/8OCB mixtures. Brazilian Journal of Physics, 41(2-3), 118.
- Ozgan, S., Yazici, M., & Ates, K. (2011). Conductance and Dielectric Anisotropy Properties of 4'-Hexyl-4-biphenylcarbonitrile and 4'-Octyloxy-4-biphenylcarbonitrile Liquid Crystals and Their Composite. Asian Journal of Chemistry, 23(7), 3247-3251.
- Sharma, A., Malik, P., Dhar, R., & Kumar, P. (2019). Improvement in electro-optical and dielectric characteristics of ZnO nanoparticles dispersed in a nematic liquid crystal mixture. Bulletin of Materials Science, 42(5), 215.
- Shen, Y., & Dierking, I. (2019). Perspectives in Liquid-Crystal-Aided Nanotechnology and Nanoscience. Applied Sciences, 9(12), 2512. Shiju, E., Arun, R., Varma, M. R., Chandrasekharan, K., Sandhyarani, N., & Varghese, S. (2017). Effect of ferroelectric nanoparticles in the alignment layer of twisted nematic liquid crystal display. Optical Materials, 67, 7-13.
- Vill, V. (1992). Early history of liquid crystalline compounds. Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 213(1), 67-71.
- Wulf, A. (1976). Difficulties with the Maier–Saupe theory of liquid crystals. The Journal of Chemical Physics, 64(1), 104-109.
- Ye, L., Liu, B., Li, F., Feng, Y., Cui, Y., & Lu, Y. (2016). The influence of Ag nanoparticles on random laser from dye-doped nematic liquid crystals. Laser Physics Letters, 13(10), 105001.
There are 22 citations in total.
Details
| Primary Language | English |
|---|---|
| Subjects | Wearable Materials |
| Journal Section | Research Articles |
| Authors | |
| Publication Date | November 29, 2019 |
| Submission Date | July 23, 2019 |
| Published in Issue | Year 2019Volume: 22 - Special Issue |
