Liquid crystal birefringence and electric dipole moment relationship with temperature, weak magnetic field and molecular geometry.
Birefringence in the mesophase of 4-cyano-4′-n-pentylbiphenyl (5CB) was measured directly under a magnetic field (1200 and 2000 gauss) as a function of temperature with field parallel and perpendicular to the optical axis. Electrical dinole moments of 5CB and benzonitrile were calculated with the Me...
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| Autores principales: | , |
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| Formato: | JOUR |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_01677322_v44_n1_p63_LopezIqlesias |
| Aporte de: |
| Sumario: | Birefringence in the mesophase of 4-cyano-4′-n-pentylbiphenyl (5CB) was measured directly under a magnetic field (1200 and 2000 gauss) as a function of temperature with field parallel and perpendicular to the optical axis. Electrical dinole moments of 5CB and benzonitrile were calculated with the Mechetti-Barón equations from measurements at three temperatures. Molecular geometries were examined with a semiempirical procedure (AMPAC). The results suqgest that thermal stirring and internal rotations appear to overcome orientational effects of the applied field. © 1989. |
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