Investigation of electro-optical and dielectric properties of pure and dispersed nematic liquid-crystal

In this study, 4-(Trans-4ʹ-n-Pentylcyclohexyl) Benzonitrile (PCH5) has been employed as a host liquid crystal (LC) to disperse carbon quantum dots (CQDs). The investigation delves into the dielectric behaviour and electro-optical properties of dispersed nematic systems featuring both pure and CQD-in...

Full description

Saved in:
Bibliographic Details
Published in:Liquid crystals 2024-09, Vol.51 (12), p.1969-1979
Main Authors: Tiwari, Sadhna, Saxena, Saransh, Tripathi, Shivangi, Pathak, Govind, Singh, Abhilasha, Kumar, Sandeep, Manohar, Rajiv
Format: Article
Language:English
Subjects:
Benzonitrile
Birefringence
carbon quantum dots
Chemical composition
Dielectric loss
Dielectric properties
Dopants
Electric fields
Electrical properties
Liquid crystals
Nematic crystals
NLC PCH5
Optical properties
Permittivity
Quantum dots
Threshold voltage
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this study, 4-(Trans-4ʹ-n-Pentylcyclohexyl) Benzonitrile (PCH5) has been employed as a host liquid crystal (LC) to disperse carbon quantum dots (CQDs). The investigation delves into the dielectric behaviour and electro-optical properties of dispersed nematic systems featuring both pure and CQD-incorporated compositions. We examined the impact of CQD dispersion on various parameters such as relative permittivity, dielectric loss, AC conductivity, birefringence, and threshold voltage in the nematic liquid crystal (NLC) PCH5 at concentrations of 0.1, 0.3, and 0.5 wt%. These properties demonstrate notable changes upon the addition of CQDs to the nematic PCH5 system, influenced by both the dopant concentration and the applied electric field. Birefringence, determined using the transmittance method, reveals higher values in dispersed systems, influenced by factors such as dopant concentration, temperature range, and chemical composition. Furthermore, the composite systems with dispersed CQDs exhibit significantly reduced threshold voltages. The observed findings are attributed to the interactions between CQDs and nematic molecules. Also, we explored potential applications for the dispersed systems investigated in this study.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2024.2369957