Energy landscapes on polymerized liquid crystal interfaces
Energy landscapes on polymerized liquid crystal interfaces
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DOI：
10.1039/d3sm00356f
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发表时间：
2023-05-22
期刊：
影响因子：
3.4
通讯作者：
Bevan，Michael A.
中科院分区：
文献类型：
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作者：
Hendley，Rachel S.;Jumai'an，Eugenie;Bevan，Michael A.
我们测量和建模单层的集中扩散胶体探针与聚合液晶（PLC）的平面表面相互作用。在拓扑缺陷在PLC表面的局部微控制器配置文件，我们观察到时间平均的二维粒子密度分布的扩散胶体探针，密切相关的PLC光学特性的空间变化。粒子浓度分布的逆蒙特卡罗分析产生了kT尺度上的二维PLC界面能景观，这是许多界面现象的固有尺度（例如，自组装、吸附、扩散）。能量景观建模为叠加的大分子排斥和货车范德华吸引力的基础上得到的液晶双折射的各向异性介电函数。模拟的货车德瓦尔斯景观捕获最净能量景观变化和相关性以及与实验PLC导演配置文件周围的缺陷。PLC缺陷附近的一些能量景观变化表明，要么额外的本地排斥相互作用，或可能需要更严格的货车德瓦尔斯模型与完整的光谱数据。这些研究结果表明，直接，灵敏的测量的KT级货车德瓦尔斯能量景观PLC界面缺陷，并建议有能力设计界面各向异性材料和货车德瓦尔斯能量景观胶体组装。
We measure and model monolayers of concentrated diffusing colloidal probes interacting with polymerized liquid crystal (PLC) planar surfaces. At topological defects in local nematic director profiles at PLC surfaces, we observe time-averaged two-dimensional particle density profiles of diffusing colloidal probes that closely correlate with spatial variations in PLC optical properties. An inverse Monte Carlo analysis of particle concentration profiles yields two-dimensional PLC interfacial energy landscapes on the kT-scale, which is the inherent scale of many interfacial phenomena (e.g., self-assembly, adsorption, diffusion). Energy landscapes are modelled as the superposition of macromolecular repulsion and van der Waals attraction based on an anisotropic dielectric function obtained from the liquid crystal birefringence. Modelled van der Waals landscapes capture most net energy landscape variations and correlate well with experimental PLC director profiles around defects. Some energy landscape variations near PLC defects indicate either additional local repulsive interactions or possibly the need for more rigorous van der Waals models with complete spectral data. These findings demonstrate direct, sensitive measurements of kT-scale van der Waals energy landscapes at PLC interfacial defects and suggest the ability to design interfacial anisotropic materials and van der Waals energy landscapes for colloidal assembly.