Skip to content

Structural relationships for the design of responsive azobenzene-based lyotropic liquid crystals

Research output: Contribution to journalArticle

Original languageEnglish
Number of pages10
JournalPhysical Chemistry Chemical Physics
Early online date30 Jan 2020
DOIs
DateAccepted/In press - 28 Jan 2020
DateE-pub ahead of print (current) - 30 Jan 2020

Abstract

Light-responsive binary (azobenzene + solvent) lyotropic liquid crystals (LCs) were investigated by structural modification of simple azobenzene molecules. Three benzoic acid-containing azobenzene molecules 4-(4-(hydroxyphenyl)diazenyl)benzoic acid (AZO1), 3-(4-(hydroxyphenyl)diazenyl)benzoic acid (AZO2) and 5-(4-(hydroxyphenyl)diazenyl)isophthalic acid (AZO3) were produced with various amide substitutions to produce tectons with a variety of hydrophobicity, size and branching. The LC mesophases formed by binary (azobenzene + solvent) systems with low volatility solvents dimethylsulfoxide (DMSO) and N,N-dimethylformamide (DMF) as well as the protic ionic liquids ethylammonium formate (EAF) and propylammonium formate (PAF), were investigated using a combination of small-angle X-ray and neutron scattering (SAXS and SANS) as well as polarising light microscopy (PLM). Increasing alkyl group length was found to have a strong influence on LC phase spacing, and changes in the position of substitution on the benzene ring influenced the preferred curvature of phases. UV-induced trans to cis isomerization of the samples was shown to influence ordering and optical birefringence, indicating potential applications in optical devices.

Documents

Documents

  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Royal Society of Chemistry at https://pubs.rsc.org/en/content/articlelanding/2020/cp/c9cp05463d#!divAbstract. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 3.54 MB, PDF document

    Embargo ends: 30/01/21

    Request copy

DOI

View research connections

Related faculties, schools or groups