Collective Relaxation Processes in Nonchiral Nematics
Nematic–nematic transitions in a highly polar nematic compound are studied, in thick cells in which the molecules are aligned parallel to the substrates but perpendicular to the applied electric field, using dielectric spectroscopy in the frequency range 1 Hz to 10 MHz over a wide temperature range....
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-06-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/13/6/962 |
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| author | Neelam Yadav Yuri P. Panarin Wanhe Jiang Georg H. Mehl Jagdish K. Vij |
| author_facet | Neelam Yadav Yuri P. Panarin Wanhe Jiang Georg H. Mehl Jagdish K. Vij |
| author_sort | Neelam Yadav |
| collection | DOAJ |
| description | Nematic–nematic transitions in a highly polar nematic compound are studied, in thick cells in which the molecules are aligned parallel to the substrates but perpendicular to the applied electric field, using dielectric spectroscopy in the frequency range 1 Hz to 10 MHz over a wide temperature range. The studied compound displays three nematic phases under cooling from the isotropic phase: ubiquitous nematic N; high polarizability N<sub>X</sub>; and ferroelectric nematic N<sub>F</sub>. Two collective processes were observed. The dielectric strength and relaxation frequency of one of the processes P<sub>2</sub> showed a dependence on the thickness of the cell. The process P<sub>1</sub> is the amplitude mode, while the process P<sub>2</sub> is the phason mode. |
| first_indexed | 2024-03-11T02:36:16Z |
| format | Article |
| id | doaj.art-e6210c239cbd4554b558a953ec19be1c |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-11T02:36:16Z |
| publishDate | 2023-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-e6210c239cbd4554b558a953ec19be1c2023-11-18T09:57:11ZengMDPI AGCrystals2073-43522023-06-0113696210.3390/cryst13060962Collective Relaxation Processes in Nonchiral NematicsNeelam Yadav0Yuri P. Panarin1Wanhe Jiang2Georg H. Mehl3Jagdish K. Vij4Department of Electronic and Electrical Engineering, Trinity College Dublin, The University of Dublin, Dublin 2, D02 PN40 Dublin, IrelandDepartment of Electronic and Electrical Engineering, Trinity College Dublin, The University of Dublin, Dublin 2, D02 PN40 Dublin, IrelandDepartment of Chemistry, University of Hull, Hull HU6 7RX, UKDepartment of Chemistry, University of Hull, Hull HU6 7RX, UKDepartment of Electronic and Electrical Engineering, Trinity College Dublin, The University of Dublin, Dublin 2, D02 PN40 Dublin, IrelandNematic–nematic transitions in a highly polar nematic compound are studied, in thick cells in which the molecules are aligned parallel to the substrates but perpendicular to the applied electric field, using dielectric spectroscopy in the frequency range 1 Hz to 10 MHz over a wide temperature range. The studied compound displays three nematic phases under cooling from the isotropic phase: ubiquitous nematic N; high polarizability N<sub>X</sub>; and ferroelectric nematic N<sub>F</sub>. Two collective processes were observed. The dielectric strength and relaxation frequency of one of the processes P<sub>2</sub> showed a dependence on the thickness of the cell. The process P<sub>1</sub> is the amplitude mode, while the process P<sub>2</sub> is the phason mode.https://www.mdpi.com/2073-4352/13/6/962dielectric spectroscopydielectric permittivityferroelectric nematicschiralrelaxation processesplanar alignment |
| spellingShingle | Neelam Yadav Yuri P. Panarin Wanhe Jiang Georg H. Mehl Jagdish K. Vij Collective Relaxation Processes in Nonchiral Nematics Crystals dielectric spectroscopy dielectric permittivity ferroelectric nematics chiral relaxation processes planar alignment |
| title | Collective Relaxation Processes in Nonchiral Nematics |
| title_full | Collective Relaxation Processes in Nonchiral Nematics |
| title_fullStr | Collective Relaxation Processes in Nonchiral Nematics |
| title_full_unstemmed | Collective Relaxation Processes in Nonchiral Nematics |
| title_short | Collective Relaxation Processes in Nonchiral Nematics |
| title_sort | collective relaxation processes in nonchiral nematics |
| topic | dielectric spectroscopy dielectric permittivity ferroelectric nematics chiral relaxation processes planar alignment |
| url | https://www.mdpi.com/2073-4352/13/6/962 |
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