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Effect of carbonaceous oil palm leaf quantum dot dispersion in nematic liquid crystal on zeta potential, optical texture and dielectric properties

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Abstract

In the present work, the dispersion of oil palm leaf based carbonaceous quantum dots (OPL QDs) in nematic liquid crystal (NLC) E 48 eutectic mixture has been reported. The dispersed systems with concentrations 0.1, 0.2, and 0.3 wt% are designated respectively, as MIX 1, MIX 2, and MIX 3. The objective of this study is to analyze the results on the zeta potential, optical texture, dielectric constant, dielectric loss, conductivity, dielectric strength, relaxation frequency, specific power loss and total power loss of pure and OPL QDs dispersed nematic E 48 system. Zeta potential measurement has been performed in the solution state to ensure dispersion stability. The optical textures and dielectric results are recorded after filling the respective samples in sample cells. The core findings in the present study show that the zeta potential varies from − 23.43 mV to + 28.07 mV that signifies the stability of OPL QDs suspension in LCs. Specific power loss (SPL) and total power loss (TPL) are found to be least for MIX 1 which shows that the problem of high power consumption in LCDs can be resolved by dispersing a small weight percent concentration of OPL QDs in LC medium (MIX 1). Improved molecular alignment in the dispersed system has been observed from the textural study which finds its application in good contrast display devices. The color change in the aligned textures with temperature has been attributed to the birefringence change. The porous nature of carbonaceous OPL QDs has its application in supercapacitors. The benchmark results of this study highlight the effect of temperature and frequency on dielectric parameters for both planar and homeotropic state of E 48 LCs. OPL QDs dispersed system display increased conductivity for MIX 3. The decrease in the activation energy for OPL QDs dispersed system in comparison to pure LC material E 48 is a consequential result of the potential barrier change. The increment in the dielectric strength and relaxation frequency of OPL QDs dispersed system is noticed in comparison to pure E 48. These outcomes open the door for the applicability of present LCs in the field of both display and non-display devices like sensors, supercapacitors, low power consumption displays, energy conversion, and electrical storage devices as well as advanced smart systems.

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Acknowledgement

Ayushi Rastogi Acknowledges UGC (F-25-1/2014-15(BSR)/ 7-177/2007/BSR) New Delhi for UGC-BSR Fellowship. Author Gurumurthy Hegde acknowledges to DST Nanomission, Govt of India for research grant with file No [SR/NM/NT-1026/2017]. Author Rajiv Manohar acknowledges UGC for the grant of a MID Career Award dated 22 March 2018 [No.F.19-224/2018 (BSR)]. Authors also acknowledges to Centre of Excellence at APJ Abdul Kalam Centre for Innovation, University of Lucknow and Dr. A. S. Parmar, Banaras Hindu University, (BHU), Varanasi for providing experimental facilities in the Laboratory.

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Authors and Affiliations

  1. Liquid Crystal Laboratory, Department of Physics, University of Lucknow, Lucknow, Uttar Pradesh, 226007, India

    Ayushi Rastogi & Rajiv Manohar

  2. Institute of Science, Department of Physics, Banaras Hindu University, Varanasi, Uttar Pradesh, 221005, India

    Fanindra Pati Pandey & Shri Singh

  3. Department of Physics, Indian Institute of Technology, Banaras Hindu University, Varanasi, Uttar Pradesh, 221 005, India

    Avanish Singh Parmar

  4. Centre for Nano-Materials and Displays, B. M. S College of Engineering, Basavanagudi, Bangalore, Karnataka, 560019, India

    Gurumurthy Hegde

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  1. Ayushi Rastogi
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  2. Fanindra Pati Pandey
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  3. Avanish Singh Parmar
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  4. Shri Singh
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  5. Gurumurthy Hegde
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Contributions

AR: conceptualization, writing manuscript, formal analysis; FPP: experiments performed and formal analysis; ASP: providing experimental facilities; GH: reviewing, and editing; SS: conceptualization, writing—original draft, visualization, supervision; RM: conceptualization, writing—original draft, visualization, supervision.

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Correspondence to Shri Singh or Rajiv Manohar.

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Rastogi, A., Pandey, F.P., Parmar, A.S. et al. Effect of carbonaceous oil palm leaf quantum dot dispersion in nematic liquid crystal on zeta potential, optical texture and dielectric properties. J Nanostruct Chem 11, 527–548 (2021). https://doi.org/10.1007/s40097-020-00382-6

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  • DOI: https://doi.org/10.1007/s40097-020-00382-6

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