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Ordering of Single Conjugated Polymers in a Nematic Liquid Crystal Host

机译:向列型液晶主体中单个共轭聚合物的排序

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摘要

We describe molecule-by-molecule observations, using single molecule fluorescence spectroscopy, of the ordering of the components in a nematic phase formed by a binary mixture of short and long rods. A stiff conjugated polymer, MEH-PPV (poly[2-methoxy-5-((2-ethylhexyl)oxy)-1,4-phenylenevinylene]), present at very low concentrations in a binary nematic-nematic phase with the mesogen 5CB (4-n-pentyl-4'-cyanobiphenyl) is investigated. We observe near-perfect orientational order of the stiff, rodlike conjugated polymers translating through a planar nematic phase. This represents striking experimental evidence for the predicted enhanced alignment of long rods in the nematic phase of a binary mixture of rods.
机译:我们使用单分子荧光光谱技术描述了分子的逐分子观察,该观察是在由短杆和长杆的二元混合物形成的向列相中各组分的顺序。硬质共轭聚合物MEH-PPV(聚[2-甲氧基-5-((2-乙基己基)氧基)-1,4-亚苯基亚乙烯基])以极低的浓度与液晶元5CB呈二元向列向列相存在研究了(4-正戊基-4'-氰基联苯)。我们观察到通过平面向列相平移的刚性棒状共轭聚合物的近乎完美的取向顺序。这代表了惊人的实验证据,证明了长棒在棒的二元混合物的向列相中的增强对准性。

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