Optical switching of bent-core liquid crystals with azocinnamoyl units

Cmok, Luka (avtor), Mattiazzi, Simon (avtor), Drevenšek Olenik, Irena (avtor), Sebastián Ugarteche, Nerea (avtor), Gak Simić, Kristina (avtor), Trišović, Nemanja (avtor), Vilfan, Mojca (avtor)

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 200 ms) 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.

• Jezik: Angleški jezik
• Ključne besede: bent-core liquid crystals, photo-switching, azocinnamoyl group, optical switching, switching dynamics
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2023
• Št. strani: Str. 1599–1607
• Številčenje: Vol. 50, no. 7/10
• PID: 20.500.12556/RUL-152840
• UDK: 532
• ISSN pri članku: 1366-5855
• DOI: 10.1080/02678292.2023.2179120
• COBISS.SI-ID: 142935299
• Datum objave v RUL: 08.12.2023

Gradivo je del revije

• Naslov: Liquid crystals
• Skrajšan naslov: Liq. cryst.
• Založnik: Taylor & Francis
• ISSN: 1366-5855
• COBISS.SI-ID: 18299943

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: tekoči kristali z upognjeno sredico, fotopreklapljanje, azocinamat, optično preklapljanje, dinamika preklapljanja, tekoči kristali