论文标题
量子点分散弯曲核列液晶和culotactic簇：实验和理论见解
Quantum-Dots Dispersed Bent-core Nematic Liquid Crystals and Cybotactic Clusters: Experimental and Theoretical Insights
论文作者
论文摘要
我们研究了平面几何形状中的量子点（QD）分散弯曲的核心液晶系统，并目前对顺序参数，介电分散和吸收光谱，光学纹理进行实验测量，并注意温度变化。弯曲的核心液晶（LC）14-2M-CH $ _3 $用作宿主材料，CDSE/ZNS Core-Shell Type QD用作掺杂剂。原始（未源性）LC 14-2M-CH $ _3 $表现出的列（N）相包含cybotactic簇，由其QDS Incorporated LC纳米复合材料保留。我们著名的发现涉及QDS分散LC系统的定向顺序参数与原始温度下的QDS分散LC系统的减少，以及由于QD的掺入而导致的cybotactic簇的大小降低。掺杂系统的减少顺序参数伴随着降低的双折射，活化能增加和介电各向异性的质量降低。我们将实验与新型的Landau-DE Gennes类型自由能为掺杂的弯曲核心LC系统进行了补充，该能量定性地捕获了掺杂诱导的减少订单参数及其随温度的变化。还分析了平均顺序参数对其他几个因素（例如群集大小，耦合参数）的依赖性。
We study a quantum-dots (QDs) dispersed bent core liquid crystalline system in planar geometry and present experimental measurements of the order parameter, dielectric dispersion and absorption spectra, optical textures, with attention to variations with temperature. A bent core liquid crystal (LC) 14-2M-CH$_3$ is used as the host material and CdSe/ZnS core-shell type QDs are used as the dopant. The nematic (N) phase exhibited by the pristine (undoped) LC 14-2M-CH$_3$ contains cybotactic clusters, which are retained by its QDs incorporated LC nanocomposite. Our notable findings concern the reduction of the orientational order parameter of the QDs dispersed LC system compared to its pristine counterpart, at fixed temperatures, and a reduction of the size of the cybotactic clusters due to the incorporation of QDs. The reduced order parameter for the doped system is accompanied by reduced birefringence, increased activation energy and a qualitative reduction in the dielectric anisotropy. We complement the experiments with a novel Landau-de Gennes type free energy for a doped bent core LC system, that qualitatively captures the doping-induced reduced order parameter and its variation with temperature. The dependency of the mean order parameter on several other factors (e.g. cluster size, coupling parameter) are also analyzed.
