Induced blue phase and twist grain boundary phase in binary mixtures of chiral calamitic and achiral hockey stick-shaped liquid crystals

• Autorzy: Mitra, Smriti , Barman, Priyanta , Das, Malay K. , Hamplová, Věra , Bubnov, Alexej
• Konferencja: 20th Optics of Liquid Crystals Conference - OLC' 2023, Szczecin, Poland
• Języki publikacji: EN

Abstrakty

EN

Frustrated phases in chiral liquid crystalline systems, such as the blue phase (BP) and the twist grain boundary (TGB) phase, can create new opportunities in liquid crystal research. These frustrated phases have unique optical properties which can be used for specific applications. A new binary mixture system composed of a chiral rod-like ferroelectric liquid crystal and an achiral hockey stick-shaped compound was designed. This binary system exhibits induced frustration, resulting in the emergence of the BP-III and TGB*A phases in addition to the chiral ferroelectric Smectic-C* phase. We report a comprehensive study on several binary mixtures (xH-22.5= 0.162, 0.25, 0.396, 0.562) designed of a chiral ferroelectric liquid crystal derived from the lactic acid, namely 4-(octyloxy)phenyl 3-methoxy-4-((4-((2-(pentyloxy)propanoyl)oxy)benzoyl)oxybenzoate and achiral hockey stick-shaped compound, namely (E)-4-((E-((3-(decyloxy)-2-methylphenyl)imino)methyl)-phenyl 3-(4-(dodecyloxy)phenyl)acrylate. These mixtures induced the blue phase (BP-III, ~2.5–6.2K)and the twist grain boundary Smectic-A*phase (TGB*A ~1.8–6K). Polarizing optical microscopy, birefringence, and dielectric spectroscopy were employed to investigate the BP-III and TGB*A phases, as those techniques provide insights into their structural and dynamic properties. The ferroelectric behaviour of the SmC* mesophase was investigated by electro-optics. The obtained results are discussed in relation to the molecular structures of the used materials.

Słowa kluczowe

EN

ferroelectric liquid crystals; hockey stick-shaped compound; lactic acid derivative; blue phase; TGBA phase

• Czasopismo: Opto-Electronics Review
• Rocznik: 2024
• Tom: Vol. 32, No. 3
• Strony: art. no. e151693
• Opis fizyczny: Bibliogr. 63 poz., rys., tab., wykr.

Twórcy

autor

Mitra, Smriti

• Department of Physics, University of North Bengal, Siliguri-734013, West Bengal, India

autor

Barman, Priyanta

• Department of Physics, University of North Bengal, Siliguri-734013, West Bengal, India

autor

Das, Malay K.

• Department of Physics, University of North Bengal, Siliguri-734013, West Bengal, India,

autor

Hamplová, Věra

• Institute of Physics, Czech Academy of Science, 18200, Prague, Czech Republic

autor

Bubnov, Alexej

• Institute of Physics, Czech Academy of Science, 18200, Prague, Czech Republic

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).

Identyfikatory

DOI

10.24425/opelre.2024.151693