Tailoring the dielectric and ferroelectric response of mixtures containing bent-core liquid crystals through light-irradiation and composition

Liebsch, Jasmin ; Strachan, Rebecca ; Suthaharan, Sivanujan ; Dominguez-Candela, Ivan ; Auria-Soro, Carlota ; San-Millan, Andres ; Walker, Rebecca ; Chilukuri, Bhaskar ; Ros, M. Blanca (Universidad de Zaragoza) ; Martinez-Felipe, Alfonso

Resumen: We report the mesomorphic behaviour, dielectric and ferroelectric properties, and computational modelling of binary mixtures containing two bent-core liquid crystals: the so-called NG75-COO (3,4́- Bis[4-(4-n-tetradecyloxybenzoyloxy)benzoyloxy]biphenyl), which forms smectic phases, and IP31- AzB (3,4′ - Bis[4-(4-n-tetradecyloxyphenylazo)benzoyloxy]biphenyl), which forms columnar phases. The phase diagram, assessed by polarised optical microscopy, shows that the binary mixtures retain the mesophase behaviour of the major component, whilst the equimolar mixture displays smectic-type phases. Dielectric and ferroelectric analyses were carried out on samples containing 10%, 50%, and 90% of IP31-AzB (molar %), and we also investigated structure–property correlations by differential functional theory. The NG75-COO/IP31-AzB mixtures undergo strong dielectric and ferroelectric response due to the presence of highly polarisable groups in the bent-core components, particularly at the ester groups. All the mixtures under study exhibit light-responsiveness induced by reversible E-to-Z photoisomerization (trans-to-cis) of the azobenzene group in IP31-AzB, together with an increase in the molecular dipole moment. The potential to tune the phase behaviour of the mixtures, as well as their dielectric and ferroelectric responses, are investigated by light irradiation under different conditions of intensity and temperature.

Idioma: Inglés

DOI: 10.1016/j.molliq.2024.124371

Año: 2024

Publicado en: Journal of Molecular Liquids 399 (2024), 124371 [11 pp.]
ISSN: 0167-7322

Factor impacto JCR: 5.2 (2024)

Categ. JCR: PHYSICS, ATOMIC, MOLECULAR & CHEMICAL rank: 6 / 39 = 0.154 (2024) - Q1 - T1
Categ. JCR: CHEMISTRY, PHYSICAL rank: 63 / 185 = 0.341 (2024) - Q2 - T2

Factor impacto CITESCORE: 10.5 - Atomic and Molecular Physics, and Optics (Q1) - Electronic, Optical and Magnetic Materials (Q1) - Spectroscopy (Q1) - Materials Chemistry (Q1) - Condensed Matter Physics (Q1) - Physical and Theoretical Chemistry (Q1)

Factor impacto SCIMAGO: 0.935 - Atomic and Molecular Physics, and Optics (Q1) - Condensed Matter Physics (Q1) - Spectroscopy (Q1) - Materials Chemistry (Q1) - Physical and Theoretical Chemistry (Q1) - Electronic, Optical and Magnetic Materials (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E47-23R
Financiación: info:eu-repo/grantAgreement/ES/MICINN-FEDER/PID2021-122882NB-I00

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Química Orgánica (Dpto. Química Orgánica)