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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
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.
ISSN: 1542-1406
1563-5287 (Online)
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Copyright: Taylor & Francis
Appears in Collections:Research Papers (SCM)

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