Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls
Changes in the extraordinary refractive indices of 4-cyano-4'-n-pentylbiphenyl (5CB) and 4-cyano-4'-n-heptylbiphenyl (7CB) were measured, in their liquid crystalline mesophase, as a function of temperature, (T) and weak constant magnetic field (B) (0-600 gauss). The field was applied paral...
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todo:paper_01677322_v62_n1-3_p181_Radice2023-10-03T15:05:20Z Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls Radice, A.M. López Iglesias, M.C. Barón, M. Deformation Liquid crystals Magnetic field effects Molecular orientation Optical variables measurement Prisms Refractive index Thermal effects 4 cyano 4 n heptylbiphenyl 4 cyano 4 n pentylbiphenyl Chatelain prism Aromatic hydrocarbons Changes in the extraordinary refractive indices of 4-cyano-4'-n-pentylbiphenyl (5CB) and 4-cyano-4'-n-heptylbiphenyl (7CB) were measured, in their liquid crystalline mesophase, as a function of temperature, (T) and weak constant magnetic field (B) (0-600 gauss). The field was applied parallel to the optical axis of the sample. Chatelain's prism was used as measuring cell, for a total of 500 measurements. The slopes of the extraordinary (ne) and the ordinary (no) refractive indices were examined as a function of temperature and magnetic field (T and B). As expected from previous work (1, 2), ne vs T was found to be negative. Consequently, there also seems to be a competition between the disorder created by temperature (internal movements, deformation and molecular rotations) and the orientational effect of the rubbed glass plates of the measuring cell, reinforced by the parallel magnetic field. On the other hand the slope ne(T) vs B (Figure) shows an anomalous behaviour in the low field region (100-400 gauss), with no explanation available yet. © 1994. Fil:Barón, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_01677322_v62_n1-3_p181_Radice |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Deformation Liquid crystals Magnetic field effects Molecular orientation Optical variables measurement Prisms Refractive index Thermal effects 4 cyano 4 n heptylbiphenyl 4 cyano 4 n pentylbiphenyl Chatelain prism Aromatic hydrocarbons |
| spellingShingle |
Deformation Liquid crystals Magnetic field effects Molecular orientation Optical variables measurement Prisms Refractive index Thermal effects 4 cyano 4 n heptylbiphenyl 4 cyano 4 n pentylbiphenyl Chatelain prism Aromatic hydrocarbons Radice, A.M. López Iglesias, M.C. Barón, M. Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls |
| topic_facet |
Deformation Liquid crystals Magnetic field effects Molecular orientation Optical variables measurement Prisms Refractive index Thermal effects 4 cyano 4 n heptylbiphenyl 4 cyano 4 n pentylbiphenyl Chatelain prism Aromatic hydrocarbons |
| description |
Changes in the extraordinary refractive indices of 4-cyano-4'-n-pentylbiphenyl (5CB) and 4-cyano-4'-n-heptylbiphenyl (7CB) were measured, in their liquid crystalline mesophase, as a function of temperature, (T) and weak constant magnetic field (B) (0-600 gauss). The field was applied parallel to the optical axis of the sample. Chatelain's prism was used as measuring cell, for a total of 500 measurements. The slopes of the extraordinary (ne) and the ordinary (no) refractive indices were examined as a function of temperature and magnetic field (T and B). As expected from previous work (1, 2), ne vs T was found to be negative. Consequently, there also seems to be a competition between the disorder created by temperature (internal movements, deformation and molecular rotations) and the orientational effect of the rubbed glass plates of the measuring cell, reinforced by the parallel magnetic field. On the other hand the slope ne(T) vs B (Figure) shows an anomalous behaviour in the low field region (100-400 gauss), with no explanation available yet. © 1994. |
| format |
JOUR |
| author |
Radice, A.M. López Iglesias, M.C. Barón, M. |
| author_facet |
Radice, A.M. López Iglesias, M.C. Barón, M. |
| author_sort |
Radice, A.M. |
| title |
Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls |
| title_short |
Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls |
| title_full |
Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls |
| title_fullStr |
Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls |
| title_full_unstemmed |
Influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls |
| title_sort |
influence of weak magnetic fields on the extraordinary refractive index of two cyanoalkylbiphenyls |
| url |
http://hdl.handle.net/20.500.12110/paper_01677322_v62_n1-3_p181_Radice |
| work_keys_str_mv |
AT radiceam influenceofweakmagneticfieldsontheextraordinaryrefractiveindexoftwocyanoalkylbiphenyls AT lopeziglesiasmc influenceofweakmagneticfieldsontheextraordinaryrefractiveindexoftwocyanoalkylbiphenyls AT baronm influenceofweakmagneticfieldsontheextraordinaryrefractiveindexoftwocyanoalkylbiphenyls |
| _version_ |
1782025213862477824 |