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ISSN 2063-5346
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SYNTHESIS AND CHARACTERIZATION OF LOW-DIMENSIONAL TEMPLATES: FUNCTIONALIZED GOLD NANO-PARTICLES (AU-NPs) DISPERSED IN ROOM TEMPERATURE NEMATIC LIQUID CRYSTALLINE DISPLAY MATERIAL

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Akash Yadav1, Bharti Yadav1, 2, B. S. Sharma3, Prashant Kumar Pandey4, Abhay S. Pandey5*
» doi: 10.48047/ecb/2023.12.si5a.0485

Abstract

From the beginning of the last three decades, studies of the impact of nanomaterials on the characteristics of liquid crystals have piqued significant scientific interest. The ability to combine two entirely unrelated sciences into one new, cross-disciplinary subject of soft matter and nanostructure is made possible by the nano size. N-(biphenyl-4-yl)acetamide on reaction with n-pentoylchloride in presence of aluminum chloride gives N-(4-pentanoyliphenyl-4yl)acetamide, when treated with N2H4 and KOH affords 1-(4-aminophenyl-4-yl)pentan-1-one. This on further reaction with NaNO2 and HCl at 0-5 C gives diazotized product 4pentylbiphenyl-4-diazoniumchloride. This product on working through Sandmeyer reaction affords 4-pentylbiphenyl-4- carbonitrile which is also recognized as 4-pentyl-4-cyanobiphenyl (5CB). This material is in a liquid crystalline form. Further, this material 5CB have been characterized and confirmed by various spectroscopic methods viz. 1H-NMR and 13C-NMR. Furthermore, low dimensional templates i.e. AuNPs were doped in the synthesized liquid crystalline material i.e. 5CB. Moreover, we made a report on an electro-optical and electrical study of gold nano particles (AuNPs), which are doped at single strength of 0.1 weight percent to nematic medium of the synthetic liquid crystal 5CB. Higher concentrations were not tested since it was found that AuNPs were bundled in various places at greater concentrations. The different electrical properties, including dielectric permittivity, loss, relaxation frequency, dielectric anisotropy and ionic conductivity, were measured using electrical (dielectric) spectroscopy for aligned samples that are homeotropic and planar in a frequency range of 1 Hz - 35 MHz. The nematic phase is what allows AuNPs to align from side to side to the nematic direction. Presence of AuNPs, on the other hand, improves nematic phase's local orientational arrangement of molecules. Because of this, the presence of AuNPs considerably reduces a threshold voltage required to switch an arrangement of the molecules as of a bright state i.e. planar arrangement toward dark state i.e. homeotropic arrangement.

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