10.1007/s40097-020-00382-6

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

  • Ayushi Rastogi1,
  • Fanindra Pati Pandey2,
  • Avanish Singh Parmar3,
  • Shri Singh2,
  • Gurumurthy Hegde4,
  • Rajiv Manohar*1,
  1. Liquid Crystal Laboratory, Department of Physics, University of Lucknow, Lucknow, Uttar Pradesh, 226007, IN
  2. Institute of Science, Department of Physics, Banaras Hindu University, Varanasi, Uttar Pradesh, 221005, IN
  3. Department of Physics, Indian Institute of Technology, Banaras Hindu University, Varanasi, Uttar Pradesh, 221 005, IN
  4. Centre for Nano-Materials and Displays, B. M. S College of Engineering, Bangalore, Karnataka, 560019, IN

Published in Issue 06-01-2021

How to Cite

Rastogi, A., Pandey, F. P., Parmar, A. S., Singh, S., Hegde, G., & Manohar, R. (2021). Effect of carbonaceous oil palm leaf quantum dot dispersion in nematic liquid crystal on zeta potential, optical texture and dielectric properties. Journal of Nanostructure in Chemistry, 11(4 (December 2021). https://doi.org/10.1007/s40097-020-00382-6
Crossref
Scopus
Google Scholar
Europe PMC

Abstract

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. Graphical abstract

Keywords

  • Oil palm leaf OPL QDs,
  • E 48 liquid crystal mixture,
  • Dielectric measurement,
  • Displays and non-display devices

References

  1. Rastogi et al. (2018) Cd1−X ZnXS/ZnS core/shell quantum dots in nematic liquid crystals to improve material parameter for better performance of liquid crystal based devices (pp. 93-101)
  2. Rastogi et al. (2019) Study of an interesting physical mechanism of memory effect in nematic liquid crystal dispersed with quantum dots (pp. 725-736) https://doi.org/10.1080/02678292.2018.1523477
  3. Pandey et al. (2020) Optical properties and zeta potential of carbon quantum dots (CQDs) dispersed nematic liquid crystal 4'-heptyl-4-biphenylcarbonitrile (7CB) https://doi.org/10.1016/j.optmat.2020.109849
  4. Rastogi et al. (2020) Time-resolved fluorescence and UV absorbance study on Elaeis guineensis/oil palm leaf based carbon nanoparticles doped in nematic liquid crystals
  5. Chao et al. (2014) Superior fast switching of liquid crystal devices using graphene quantum dots (pp. 761-767) https://doi.org/10.1080/02678292.2014.889233
  6. Wang and Hu (2014) Carbon quantum dots: synthesis, properties and applications https://doi.org/10.1039/C4TC00988F
  7. Ambasankar et al. (2017) Study of electrical charge storage in polymer–carbon quantum dot composite (pp. 4241-4247) https://doi.org/10.1002/slct.201700100
  8. Praseetha et al. (2019) Enhanced optical nonlinearity in nematic liquid crystal on doping with CdSe quantum dot (pp. 497-503)
  9. Wu et al. (2007) CdS nanorods imbedded in liquid crystal cells for smart optoelectronic devices (pp. 1908-1913) https://doi.org/10.1021/nl070541n
  10. Pandey et al. (2017) CdTe quantum dot dispersed ferroelectric liquid crystal: transient memory with faster optical response and quenching of photoluminescence (pp. 71-80)
  11. Kurochkina et al. (2018) Photoluminescence of CdSe/ZnS quantum dots in nematic liquid crystals in electric fields (pp. 1544-1549) https://doi.org/10.3762/bjnano.9.145
  12. Kumar et al. (2014) Catalyst free silica templated porous carbon nanoparticles from bio-waste materials https://doi.org/10.1039/C4CC04378B
  13. Ali et al. (2017) Carbon nanospheres derived from Lablab purpureus for high performance supercapacitor electrodes: a green approach https://doi.org/10.1039/C7DT02392H
  14. Tripathi et al. (2017) Pristine and quantum dots dispersed nematic liquid crystal. Impact of dispersion and applied voltage on dielectric and electro-optical properties (pp. 61-66) https://doi.org/10.1016/j.optmat.2017.04.023
  15. Singh et al. (2019) Investigation of dielectric and electro-optical properties of nematic liquid crystal with the suspension of biowaste-based porous carbon nanoparticles (pp. 1808-1820) https://doi.org/10.1080/02678292.2019.1606354
  16. Pathak et al. (2018) Analysis of birefringence property of three different nematic liquid crystals dispersed with TiO2 nanoparticles (pp. 11-18) https://doi.org/10.1016/j.opelre.2017.11.005
  17. Rastogi et al. (2020) Effect of oil palm leaf–based carbon quantum dot on nematic liquid crystal and its electro–optical effects https://doi.org/10.1080/02678292.2020.1817997
  18. Li et al. (2005) Refractive- index matching between liquid crystals and photopolymers
  19. Rastogi and Manohar (2019) Effect of graphene oxide dispersion in nematic mesogen and their characterization results https://doi.org/10.1007/s00339-019-2493-0
  20. Lück and Latz (2018) Modeling of the electrochemical double layer and its impact on intercalation reactions (pp. 27804-27821) https://doi.org/10.1039/C8CP05113E
  21. Sudo et al. (2013) Easy measurement and analysis method of zeta potential and electrophoretic mobility of water-dispersed colloidal particles by using a self-mixing solid-state laser https://doi.org/10.1063/1.4818485
  22. Rayssi et al. (2018) Frequency and temperature-dependence of dielectric permittivity and electric modulus studies of the solid solution Ca0.85Er0.1 Ti1−xCo4x/3 O3 (0 ≤ x ≤ 0.1) https://doi.org/10.1039/C8RA00794B
  23. Rayssi et al. (2017) Structural, electric and dielectric properties of https://doi.org/10.1007/s00339-017-1365-8
  24. Cetiner and Sirin (2016) Frequency and temperature dependence of dielectric behaviors for conductive acrylic composites
  25. Koops (1951) On the dispersion of resistivity and dielectric constant of some semiconductors at audio frequencies (pp. 121-124) https://doi.org/10.1103/PhysRev.83.121
  26. Gheshlaghi et al. (2019) Structural dependent, dielectric and conduction analysis of CdSe based quantum dots https://doi.org/10.1007/s42452-019-0451-2
  27. Gambino et al. (1987) Grain boundary electronic states in some simple ZnO varistors 61(7) (pp. 2571-2574) https://doi.org/10.1063/1.337934
  28. Mansingh (1980) AC conductivity of amorphous semiconductors (pp. 325-351) https://doi.org/10.1007/BF02908579
  29. Kumar et al. (2018) Quantum dots dispersed sticky nematic liquid crystal: studies on dielectric permittivities, elastic constants and electrical conductivity (pp. 10-18)
  30. Sharma et al. (2019) Electro-optical and dielectric responses of ZnO nanoparticles doped nematic liquid crystal in in-plane switching (IPS) Mode 202(1) (pp. 52-66) https://doi.org/10.1080/10584587.2019.1674824
  31. Singh (2015) Dielectric relaxation studies of silver nanoparticles dispersed liquid crystal 8(3) (pp. 2176-2188) https://doi.org/10.24297/jap.v8i3.1496
  32. Gao et al. (2016) Effect of alkyl chain length on the orientational behavior of liquid crystal https://doi.org/10.1007/s11249-016-0663-1