Optical switching of bent-core liquid crystals with azocinnamoyl units
Само за регистроване кориснике
2023
Аутори
Cmok, LukaMattiazzi, Simon
Drevensek-Olenik, Irena
Sebastian, Nerea
Gak Simić, Kristina
Trišović, Nemanja
Vilfan, Mojca
Чланак у часопису (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
We report on observations of optical switching in bent-core liquid crystals possessing azocinnamoyl groups in both elongated side arms. UV-activated switching was observed in two of the synthesised materials, both of which were studied optically and with dielectric spectroscopy. Polarising microscopy was used to measure the changes in optical transmittance, and while no illumination effect was seen in the nematic phase, visible changes were observed in the smectic phase, most pronounced in the close vicinity of the smectic to nematic-phase transition. Switching dynamics was characterised, and we found that the average switching time varies strongly with temperature. The relaxation process is faster (below (Formula presented.)) and exhibits no significant temperature dependence. Dielectric measurements have shown that the observed smectic C phases were not polar with the molecules possessing a rather small electric dipole moment. Upon illumination, small differences in the dielectric pe...rmittivity were observed only in the smectic phase, suggesting that the illumination effect can be attributed to changes in the molecular conformational and orientational order.
Кључне речи:
azocinnamoyl group / Bent-core liquid crystals / optical switching / photo-switching / switching dynamicsИзвор:
Liquid Crystals, 2023Издавач:
- Taylor and Francis Ltd.
Финансирање / пројекти:
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200135 (Универзитет у Београду, Технолошко-металуршки факултет) (RS-MESTD-inst-2020-200135)
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200287 (Иновациони центар Технолошко-металуршког факултета у Београду доо) (RS-MESTD-inst-2020-200287)
Колекције
Институција/група
Inovacioni centarTY - JOUR AU - Cmok, Luka AU - Mattiazzi, Simon AU - Drevensek-Olenik, Irena AU - Sebastian, Nerea AU - Gak Simić, Kristina AU - Trišović, Nemanja AU - Vilfan, Mojca PY - 2023 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5955 AB - We report on observations of optical switching in bent-core liquid crystals possessing azocinnamoyl groups in both elongated side arms. UV-activated switching was observed in two of the synthesised materials, both of which were studied optically and with dielectric spectroscopy. Polarising microscopy was used to measure the changes in optical transmittance, and while no illumination effect was seen in the nematic phase, visible changes were observed in the smectic phase, most pronounced in the close vicinity of the smectic to nematic-phase transition. Switching dynamics was characterised, and we found that the average switching time varies strongly with temperature. The relaxation process is faster (below (Formula presented.)) and exhibits no significant temperature dependence. Dielectric measurements have shown that the observed smectic C phases were not polar with the molecules possessing a rather small electric dipole moment. Upon illumination, small differences in the dielectric permittivity were observed only in the smectic phase, suggesting that the illumination effect can be attributed to changes in the molecular conformational and orientational order. PB - Taylor and Francis Ltd. T2 - Liquid Crystals T1 - Optical switching of bent-core liquid crystals with azocinnamoyl units DO - 10.1080/02678292.2023.2179120 ER -
@article{ author = "Cmok, Luka and Mattiazzi, Simon and Drevensek-Olenik, Irena and Sebastian, Nerea and Gak Simić, Kristina and Trišović, Nemanja and Vilfan, Mojca", year = "2023", abstract = "We report on observations of optical switching in bent-core liquid crystals possessing azocinnamoyl groups in both elongated side arms. UV-activated switching was observed in two of the synthesised materials, both of which were studied optically and with dielectric spectroscopy. Polarising microscopy was used to measure the changes in optical transmittance, and while no illumination effect was seen in the nematic phase, visible changes were observed in the smectic phase, most pronounced in the close vicinity of the smectic to nematic-phase transition. Switching dynamics was characterised, and we found that the average switching time varies strongly with temperature. The relaxation process is faster (below (Formula presented.)) and exhibits no significant temperature dependence. Dielectric measurements have shown that the observed smectic C phases were not polar with the molecules possessing a rather small electric dipole moment. Upon illumination, small differences in the dielectric permittivity were observed only in the smectic phase, suggesting that the illumination effect can be attributed to changes in the molecular conformational and orientational order.", publisher = "Taylor and Francis Ltd.", journal = "Liquid Crystals", title = "Optical switching of bent-core liquid crystals with azocinnamoyl units", doi = "10.1080/02678292.2023.2179120" }
Cmok, L., Mattiazzi, S., Drevensek-Olenik, I., Sebastian, N., Gak Simić, K., Trišović, N.,& Vilfan, M.. (2023). Optical switching of bent-core liquid crystals with azocinnamoyl units. in Liquid Crystals Taylor and Francis Ltd... https://doi.org/10.1080/02678292.2023.2179120
Cmok L, Mattiazzi S, Drevensek-Olenik I, Sebastian N, Gak Simić K, Trišović N, Vilfan M. Optical switching of bent-core liquid crystals with azocinnamoyl units. in Liquid Crystals. 2023;. doi:10.1080/02678292.2023.2179120 .
Cmok, Luka, Mattiazzi, Simon, Drevensek-Olenik, Irena, Sebastian, Nerea, Gak Simić, Kristina, Trišović, Nemanja, Vilfan, Mojca, "Optical switching of bent-core liquid crystals with azocinnamoyl units" in Liquid Crystals (2023), https://doi.org/10.1080/02678292.2023.2179120 . .