Design, mesomorphic properties and rheological characterization of a novel calamitic low molecular weight liquid crystal

0483778 - FZÚ 2018 RIV ES eng C - Conference Paper (international conference)
Cidade, M.T. - Cigl, Martin - Hamplová, Věra - Machado, A. - Bubnov, Alexej
Design, mesomorphic properties and rheological characterization of a novel calamitic low molecular weight liquid crystal.
Proceedings of the Iberian Meeting on Rheology - The Multidisciplinary Science of Rheology - Towards a healthy and sustainable development. Spain: Valencia, 2017 - (Hernández, M.; Sanz, T.; Salvador, A.; Rubio Hernández, F.; Stein, R.), s. 151-154. ISBN 978-84-697-5123-7.
[The Iberian Meeting on Rheology /105./ IBEREO 2017. Valencia (ES), 08.08.2017-09.08.2017]
R&D Projects: GA ČR GA16-12150S
Institutional support: RVO:68378271
Keywords : liquid crystal * smectic * nematic * rheology * ER effect
OECD category: Nano-materials (production and properties)
http://e-rheo-iba.org/Papers/IBEREO2017.pdf

Electrorheological (ER) fluids are smart materials that experience an abrupt increase of viscosity when subjected to an external electric field applied perpendicular to the flow field. The reversible change in viscosity turns them suitable for applications in mechanical devices, like brakes, damping systems and clutches. Among the fluids capable of presenting ER effect are self-assembling materials, specifically the LCs. In this work the design and mesomorphic properties of a novel calamitic low molecular weight LC are presented. Small angle oscillatory shear measurements and steady state measurements were performed, in the nematic and smectic A phases, respectively, without and with an electric field applied perpendicular to the flow direction. The increase of the viscosity values was found less than three times while increasing the electric field up to 2 kV/mm. It gives evidence that this specific LC material can be potentially appropriate for application in electro-optic devices.

Permanent Link: http://hdl.handle.net/11104/0278976