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

中文翻译：

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碳质油棕榈叶量子点在向列型液晶中的分散对ζ电势，光学织构和介电性能的影响

在目前的工作中，已经报道了基于油棕叶的碳质量子点（OPL QDs）在向列液晶（NLC）E 48共晶混合物中的分散。分别将浓度分别为0.1、0.2和0.3 wt％的分散体系指定为MIX 1，MIX 2和MIX3。本研究的目的是分析zeta电位，光学织构，介电常数，介电常数的结果。纯和OPL QD分散向列E 48系统的损耗，电导率，介电强度，弛豫频率，比功率损耗和总功率损耗。在溶液状态下进行ζ电势测量以确保分散稳定性。在将各个样品填充到样品池中后，记录其光学纹理和介电结果。本研究的核心发现表明，ζ电位在− 23.43 mV至+ 28.07 mV之间变化，这表明OPL QD悬浮在LC中的稳定性。发现MIX 1的比功率损耗（SPL）和总功率损耗（TPL）最小，这表明LCD中的高功耗问题可以通过将少量重量百分比的OPL QD分散在LC介质中来解决（MIX 1）。从纹理研究中观察到分散系统中分子排列的改善，发现其在良好的对比度显示装置中的应用。对齐的纹理随温度的颜色变化已归因于双折射变化。碳质OPL QD的多孔性质已在超级电容器中得到应用。这项研究的基准结果强调了温度和频率对E 48 LC平面和垂直状态介电参数的影响。OPL QD分散系统显示的MIX 3电导率增加。与纯LC材料E 48相比，OPL QD分散系统的活化能降低是势垒变化的必然结果。与纯E 48相比，OPL QD分散系统的介电强度和弛豫频率有所提高。这些结果为当前LC在显示和非显示设备领域（如传感器，超级电容器，低功耗显示器，能量转换和电存储设备以及先进的智能系统。OPL QD分散系统显示的MIX 3电导率增加。与纯LC材料E 48相比，OPL QD分散系统的活化能降低是势垒改变的必然结果。与纯E 48相比，OPL QD分散系统的介电强度和弛豫频率有所提高。这些结果为当前LC在显示和非显示设备领域（如传感器，超级电容器，低功耗显示器，能量转换和电存储设备以及先进的智能系统。OPL QD分散系统显示的MIX 3电导率增加。与纯LC材料E 48相比，OPL QD分散系统的活化能降低是势垒变化的必然结果。与纯E 48相比，OPL QD分散系统的介电强度和弛豫频率有所提高。这些结果为当前LC在显示和非显示设备领域（如传感器，超级电容器，低功耗显示器，能量转换和电力存储设备以及先进的智能系统。

图形概要