Title:	Rheological properties of a chiral liquid crystal exhibiting type-II character
Authors:	Rajeswari, M. Ananthaiah, J. Dabrowski, R. Sastry, V.S.S. Dhara, Surajit Sadashiva, B.K.
Keywords:	Shear type-II liquid crystals viscosity
Issue Date:	2011
Publisher:	Taylor & Francis
Citation:	Molecular Crystals and Liquid Crystals, 2011, Vol.547, p39
Abstract:	We measured rheological properties of cholesteryl nonanoate and its mixture with 40-octyloxy-4-cyanobiphenyl. In both systems, wider temperature range of blue phase under shear with anomalous increase in viscosity associated with non- Newtonian flow behavior has been observed. Shear thinning followed by Newtonian flow is found in cholesteric phase and non-Newtonian flow behavior at high shear rates is seen in smectic-A phase. In cholesteryl nonanoate a small peak in the viscosity at cholesteric to smectic-A transition along with a shear rate dependent viscosity at higher shear rate is attributed to the type-II character of the compound. We find that the type-II character of the compound is further enhanced by mixing a small amount (20 wt%) of 40-octyloxy-4-cyanobiphenyl in cholesteryl nonanoate. No significant change in the temperature dependent rheological behavior is observed at the twistgrain- boundary-A to smectic-A transition. It is suggested that the small anomalous peak in the viscosity just above the twist-grain-boundary-A phase is due the existence of chiral line liquid phase.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/4071
ISSN:	1542-1406 1563-5287 (Online)
Alternative Location:	http://dx.doi.org/10.1080/15421406.2011.572507
Copyright:	Taylor & Francis
Appears in Collections:	Research Papers (SCM)

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