Rheological characterization of a liquid crystalline diol and its dependence with an applied electric field

0377073 - FZÚ 2013 RIV GB eng J - Journal Article
Cidade, M.T. - Pereira, G. - Bubnov, Alexej - Hamplová, Věra - Kašpar, Miroslav - Casquilho, J.P.
Rheological characterization of a liquid crystalline diol and its dependence with an applied electric field.
Liquid Crystals. Roč. 39, č. 2 (2012), s. 191-197. ISSN 0267-8292. E-ISSN 1366-5855
R&D Projects: GA AV ČR IAA100100911; GA AV ČR(CZ) GA202/09/0047; GA ČR(CZ) GAP204/11/0723
Grant - others:RFASI(RU) 02.740.11.5166
Institutional research plan: CEZ:AV0Z10100520
Keywords : rheological characterization, * liquid crystalline diol * mesomorphic behaviour * electrorheological effect
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.959, year: 2012
http://dx.doi.org/10.1080/02678292.2011.628702

In the present work the rheological characterization (steady state and oscillatory data) of a non-chiral low molecular weight liquid crystalline diol (denoted as HBP 6/6) exhibiting the nematic and smetic phases over a broad temperature range is presented. A non-newtonian flow behaviour was found. This result, together with the progressive increase of the viscosity observed near the nematic – isotropic transition, suggests that the material behaves like a polymer, due to hydrogen bonding. The effect of an electric field applied normal to the flow direction, on the steady state in the nematic phase has been also established. An electrorheological effect shows up, as an enhancement of the apparent viscosity, due to the positive dielectric anisotropy of this material. It has been found that the increase of the apparent viscosity scales linearly with the applied field strength.
Permanent Link: http://hdl.handle.net/11104/0209327