Jump to main content
Jump to site search

Issue 13, 2013
Previous Article Next Article

The elastic and optical properties of a bent-core thiadiazole nematic liquid crystal: the role of the bend angle

Author affiliations

Abstract

The elastic and optical properties of a bent-core thiadiazole nematic liquid crystal are reported. The system exhibits unusually large values of birefringence (∼0.4), which can be partly attributed to significant conjugation in the molecular structure. It is found that the splay (K11), twist (K22) and bend (K33) elastic constants, determined from studies of the Freedericksz transition, satisfy K33 > K11 > K22 across the wide nematic range studied. Such behaviour is analogous to that commonly observed in calamitic nematic liquid crystals but is in contrast to all other bent-core nematic materials reported to date where it is found that K33 < K11. Such a result questions some of the current explanations that have been put forward to explain the elastic behaviour of bent-core materials. Using a molecular field theory, combined with DFT calculations of the molecular structure, we can ascribe the different elastic behaviour to the value of the bend angle in the molecular core. This angle is shown to play a subtle and substantial role in determining the physical properties of bent-core nematic liquid crystals.

Graphical abstract: The elastic and optical properties of a bent-core thiadiazole nematic liquid crystal: the role of the bend angle

Back to tab navigation

Publication details

The article was received on 14 Dec 2012, accepted on 22 Jan 2013 and first published on 22 Jan 2013


Article type: Paper
DOI: 10.1039/C3TC00852E
Citation: J. Mater. Chem. C, 2013,1, 2416-2425
  •   Request permissions

    The elastic and optical properties of a bent-core thiadiazole nematic liquid crystal: the role of the bend angle

    S. Kaur, L. Tian, H. Liu, C. Greco, A. Ferrarini, J. Seltmann, M. Lehmann and H. F. Gleeson, J. Mater. Chem. C, 2013, 1, 2416
    DOI: 10.1039/C3TC00852E

Search articles by author

Spotlight

Advertisements