Title:	Nematic liquid crystal dispersed with twodimensional functionalised graphene oxide (fGO): insights on improving the nematic ordering and reducing electro-optic response time
Authors:	Sahai, Mudit S. J., Shivaraja Kumar, Sandeep Gupta, R. K. V, Manjuladevi
Keywords:	Nematic liquid crystal functionalised graphene oxide electro-optic response time dielectric anisotropy two-dimensional dopant nanocomposites
Issue Date:	18-Jan-2024
Publisher:	Taylor & Francis Group
Citation:	Liquid Crystals, 2024, p1-15
Abstract:	Doping a nematic liquid crystal (NLC) with nanoparticles (NPs) of varied dimensions and properties to form LC-NP nanocomposites with improved electro-optic and dielectric properties has recently been a much-explored field of work. But still, NLC nanocomposites based on two-dimensional (2D) NPs have not been studied vividly because of the high tendency of 2D NPs to aggregate together. In the present work, we have studied the effect of incorporating hexadecanethiol functionalised graphene oxide (fGO), a 2D NP, in a conventional NLC medium under varying doping concentrations. We found that at a lower doping concentration (⁓10−4 wt.%), the NLC nanocomposite showed a substantial increase in dielectric anisotropy (Δε) and birefringence (Δμ) values as compared to pure NLC sample. A significant decrease (⁓50%) in ionic conductivity as well as reduced electro-optic response time (⁓75%) was also observed in this NLC nanocomposite. As the fGO doping concentration was increased (⁓10−2 wt.%), a reverse trend was observed for Δε, Δμ and response time values, which declined sharply with increasing doping concentration. Hence, the present work highlights two different working mechanisms at low- and high-doping concentrations of 2D NPs.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/8280
Alternative Location:	https://doi.org/10.1080/02678292.2024.2303397
Copyright:	2024, Taylor & Francis Group
Appears in Collections:	Research Papers (SCM)

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