量子点分散的弯曲核Nematic Liquid Crystals和准有序团簇：实验和理论研究
Quantum-Dots Dispersed Bent-core Nematic Liquid Crystals and Cybotactic Clusters: Experimental and Theoretical Insights
摘要：
本文研究了量子点（QDs）分散的弯曲核平面液晶体系，给出了其序参量、介电色散和吸收光谱、光学织构随温度变化的实验测量结果。使用弯芯液晶（LC）14- 2 M-CH $_3$作为主体材料，并且使用CdSe/ZnS核-壳型QD作为掺杂剂。由原始（未掺杂）LC 14- 2 M-CH $_3$表现出的双（N）相包含cybotactic簇，其被其QD掺入的LC纳米复合材料保留。我们的显着的研究结果关注的量子点分散的LC系统的取向序参量的减少相比，其原始的对应物，在固定的温度下，和减少的cybotactic集群的大小由于量子点的掺入。掺杂系统的降低的序参量伴随着降低的双折射、增加的激活能和介电各向异性的定性降低。我们补充了一个新的Landau-de Gennes型自由能的掺杂弯曲芯LC系统的实验，定性地捕捉掺杂诱导的减少序参量及其随温度的变化。还分析了平均序参量对其他几个因素（如团簇大小、耦合参数）的依赖性。
英文摘要：
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.
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