Dynamics of photoinduced changes in birefringence and dichroism in a nematic phase containing an azobenzene as dopant
Changes in birefringence and dichroism induced by light were monitored after pulse excitation of a nematic phase consisting of a mixture of a low molecular weight liquid crystal (ZLI-1132) and a dopant 4-(N,N-dimethylamino)- azobenzene. After excitation in the UV, large changes in the light transmit...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_1474905X_v1_n7_p507_Bossi |
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todo:paper_1474905X_v1_n7_p507_Bossi2023-10-03T16:18:24Z Dynamics of photoinduced changes in birefringence and dichroism in a nematic phase containing an azobenzene as dopant Bossi, M.L. Aramendía, P.F. 4 (n,n dimethylamino) azobenzene azobenzene azobenzene derivative unclassified drug article birefringence dynamics isomerization light light absorption priority journal ultraviolet irradiation Changes in birefringence and dichroism induced by light were monitored after pulse excitation of a nematic phase consisting of a mixture of a low molecular weight liquid crystal (ZLI-1132) and a dopant 4-(N,N-dimethylamino)- azobenzene. After excitation in the UV, large changes in the light transmitted by the sample, placed between polarizers at various angles or in the polarized absorption spectra, could be detected and were monitored as a function of time and temperature in samples with 1-10% w/w of dopant. Birefringence experiments, performed with different monitoring wavelengths and with dopants that degrade all the absorbed energy as heat, demonstrate that all the changes observed are due to the photoisomerization process of the dopant. The recovery of the optical delay in the sample and of the polarized absorption follows the same monoexponential kinetics, indicating that E-Z isomerization of the dopant governs the order of the nematic phase. When samples are irradiated near the clearing point, a photoinduced nematic-isotropic phase change is observed. © The Royal Society of Chemistry and Owner Societies 2002. Fil:Bossi, M.L. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Aramendía, P.F. 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_1474905X_v1_n7_p507_Bossi |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
4 (n,n dimethylamino) azobenzene azobenzene azobenzene derivative unclassified drug article birefringence dynamics isomerization light light absorption priority journal ultraviolet irradiation |
| spellingShingle |
4 (n,n dimethylamino) azobenzene azobenzene azobenzene derivative unclassified drug article birefringence dynamics isomerization light light absorption priority journal ultraviolet irradiation Bossi, M.L. Aramendía, P.F. Dynamics of photoinduced changes in birefringence and dichroism in a nematic phase containing an azobenzene as dopant |
| topic_facet |
4 (n,n dimethylamino) azobenzene azobenzene azobenzene derivative unclassified drug article birefringence dynamics isomerization light light absorption priority journal ultraviolet irradiation |
| description |
Changes in birefringence and dichroism induced by light were monitored after pulse excitation of a nematic phase consisting of a mixture of a low molecular weight liquid crystal (ZLI-1132) and a dopant 4-(N,N-dimethylamino)- azobenzene. After excitation in the UV, large changes in the light transmitted by the sample, placed between polarizers at various angles or in the polarized absorption spectra, could be detected and were monitored as a function of time and temperature in samples with 1-10% w/w of dopant. Birefringence experiments, performed with different monitoring wavelengths and with dopants that degrade all the absorbed energy as heat, demonstrate that all the changes observed are due to the photoisomerization process of the dopant. The recovery of the optical delay in the sample and of the polarized absorption follows the same monoexponential kinetics, indicating that E-Z isomerization of the dopant governs the order of the nematic phase. When samples are irradiated near the clearing point, a photoinduced nematic-isotropic phase change is observed. © The Royal Society of Chemistry and Owner Societies 2002. |
| format |
JOUR |
| author |
Bossi, M.L. Aramendía, P.F. |
| author_facet |
Bossi, M.L. Aramendía, P.F. |
| author_sort |
Bossi, M.L. |
| title |
Dynamics of photoinduced changes in birefringence and dichroism in a nematic phase containing an azobenzene as dopant |
| title_short |
Dynamics of photoinduced changes in birefringence and dichroism in a nematic phase containing an azobenzene as dopant |
| title_full |
Dynamics of photoinduced changes in birefringence and dichroism in a nematic phase containing an azobenzene as dopant |
| title_fullStr |
Dynamics of photoinduced changes in birefringence and dichroism in a nematic phase containing an azobenzene as dopant |
| title_full_unstemmed |
Dynamics of photoinduced changes in birefringence and dichroism in a nematic phase containing an azobenzene as dopant |
| title_sort |
dynamics of photoinduced changes in birefringence and dichroism in a nematic phase containing an azobenzene as dopant |
| url |
http://hdl.handle.net/20.500.12110/paper_1474905X_v1_n7_p507_Bossi |
| work_keys_str_mv |
AT bossiml dynamicsofphotoinducedchangesinbirefringenceanddichroisminanematicphasecontaininganazobenzeneasdopant AT aramendiapf dynamicsofphotoinducedchangesinbirefringenceanddichroisminanematicphasecontaininganazobenzeneasdopant |
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