Comprehensive studies on dielectric properties of p-methoxy benzylidene p-decyl aniline with function of temperature and frequency in planar geometry: A potential nematic liquid crystal for display devices

doi:10.1088/1674-1056/abdda9

中国物理B ›› 2021, Vol. 30 ›› Issue (6): 64208-064208.doi: 10.1088/1674-1056/abdda9

Comprehensive studies on dielectric properties of p-methoxy benzylidene p-decyl aniline with function of temperature and frequency in planar geometry: A potential nematic liquid crystal for display devices

Pankaj Kumar Tripathi^1,†, Kunwar Vikram², Mithlesh Tiwari³, and Ajay Shriram⁴

1 Department of Physics, Lovely Professional University, Phagwara-144411, Punjab, India;
2 Department of Allied Science, Graphic Era(Deemed to be university), Dehradun-248002 India;
3 Department of Physics and Electronics, Dr. Ram Manohar Lohia Avadh University, Ayodhya-224001, U. P., India;
4 School of Computer Science & Information Technology, Jain(Deemed-to-be-University), Bengaluru-560069, Karnataka, India

收稿日期:2020-10-15 修回日期:2020-12-29 接受日期:2021-01-20 出版日期:2021-05-18 发布日期:2021-06-09
通讯作者: Pankaj Kumar Tripathi E-mail:pankajtripathi19@gmail.com

Comprehensive studies on dielectric properties of p-methoxy benzylidene p-decyl aniline with function of temperature and frequency in planar geometry: A potential nematic liquid crystal for display devices

Pankaj Kumar Tripathi^1,†, Kunwar Vikram², Mithlesh Tiwari³, and Ajay Shriram⁴

1 Department of Physics, Lovely Professional University, Phagwara-144411, Punjab, India;
2 Department of Allied Science, Graphic Era(Deemed to be university), Dehradun-248002 India;
3 Department of Physics and Electronics, Dr. Ram Manohar Lohia Avadh University, Ayodhya-224001, U. P., India;
4 School of Computer Science & Information Technology, Jain(Deemed-to-be-University), Bengaluru-560069, Karnataka, India

Received:2020-10-15 Revised:2020-12-29 Accepted:2021-01-20 Online:2021-05-18 Published:2021-06-09
Contact: Pankaj Kumar Tripathi E-mail:pankajtripathi19@gmail.com

摘要/Abstract

摘要： The dielectric properties of the nematic mesophase, p-methoxy benzylidene p-decyl aniline (MBDA), measured in planar geometry with a function of frequency and temperature are investigated in detail. The complex dielectric permittivity (ε' and ε″) is also studied at a bias voltage of 10 V for planar aligned sample cell of nematic mesophase. The dielectric permittivity with bias voltage attains a higher (> 2 times) value than that without bias voltage at a temperature of 56℃, which is due to the fact that the linking group of nematic molecules is internally interacted with an applied bias voltage. This is supported by observing an enhanced dielectric permittivity of nematic liquid crystal (LC) in the presence of bias voltage, which can be fully explained as the increasing of the corresponding dipole moment. The dielectric relaxation behaviors of nematic LC are also demonstrated for planar aligned sample cell. The remarkable results are observed that the relaxation frequency shifts into low frequency region with the increase of the bias voltage applied to the planar aligned sample cells. The dielectric relaxation spectra are fitted by Cole-Cole nonlinear curve fitting for nematic mesophase in order to determine the dielectric strength.

关键词: dielectric permittivity, dielectric loss, relaxation frequency, nematic mesogen

Abstract: The dielectric properties of the nematic mesophase, p-methoxy benzylidene p-decyl aniline (MBDA), measured in planar geometry with a function of frequency and temperature are investigated in detail. The complex dielectric permittivity (ε' and ε″) is also studied at a bias voltage of 10 V for planar aligned sample cell of nematic mesophase. The dielectric permittivity with bias voltage attains a higher (> 2 times) value than that without bias voltage at a temperature of 56℃, which is due to the fact that the linking group of nematic molecules is internally interacted with an applied bias voltage. This is supported by observing an enhanced dielectric permittivity of nematic liquid crystal (LC) in the presence of bias voltage, which can be fully explained as the increasing of the corresponding dipole moment. The dielectric relaxation behaviors of nematic LC are also demonstrated for planar aligned sample cell. The remarkable results are observed that the relaxation frequency shifts into low frequency region with the increase of the bias voltage applied to the planar aligned sample cells. The dielectric relaxation spectra are fitted by Cole-Cole nonlinear curve fitting for nematic mesophase in order to determine the dielectric strength.

Key words: dielectric permittivity, dielectric loss, relaxation frequency, nematic mesogen

中图分类号: (Liquid crystals)

42.70.Df

42.79.Kr (Display devices, liquid-crystal devices) 51.70.+f (Optical and dielectric properties) 78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))

Pankaj Kumar Tripathi, Kunwar Vikram, Mithlesh Tiwari, and Ajay Shriram. Comprehensive studies on dielectric properties of p-methoxy benzylidene p-decyl aniline with function of temperature and frequency in planar geometry: A potential nematic liquid crystal for display devices[J]. 中国物理B, 2021, 30(6): 64208-064208.

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Comprehensive studies on dielectric properties of p-methoxy benzylidene p-decyl aniline with function of temperature and frequency in planar geometry: A potential nematic liquid crystal for display devices

Comprehensive studies on dielectric properties of p-methoxy benzylidene p-decyl aniline with function of temperature and frequency in planar geometry: A potential nematic liquid crystal for display devices

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