Title:	Fast response in TN liquid-crystal cells: effect of functionalised carbon nanotubes
Authors:	Kumar, Jitendra Manjuladevi, V. Gupta, Raj Kumar Kumar, Sandeep
Issue Date:	Apr-2016
Publisher:	Taylor & Francis
Citation:	Liquid Crystals, 2016, Vol.43, p 488-496
Abstract:	The optical response time of a nematic liquid crystal (NLC) decreases due to incorporation of carbon nanotubes (CNTs) in the liquid-crystal host. Such reduction is believed to be due to an increase in the elastic constant of the nanotube-doped LC system. In this paper, we present the effect on optical response due to doping an NLC with octadecylamine functionalised single-walled carbon nanotubes (ODA-SWCNT) in a twisted alignment mode. The electro-optic switching amplitude of ODA-SWCNT nanocomposites of NLC decreases compared to pure NLC. A fast response time is observed with an increase in the concentration of ODA-SWCNT in NLC host. Additionally, optical response of pure NLC in a twisted nematic (TN) cell fabricated using mixtures of polyimide (PI) and ODA-SWCNT as an alignment layer is investigated. The optical response time decreased by ~75% in a TN cell fabricated with a mixture of PI and ODA-SWCNT compared to that of a TN cell prepared using a pure PI alignment layer. The presence of ODA-SWCNT in the alignment layer enhances the surface anchoring of the NLC molecules leading to an increase in the elastic constant and a decrease in the optical response time of NLC.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/6474
ISSN:	0267-8292 1366-5855 (Online)
Alternative Location:	http://dx.doi.org/10.1080/02678292.2015.1119320
Copyright:	2015 Taylor & Francis
Appears in Collections:	Research Papers (SCM)

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