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首页> 外文会议>Jubilee International Conference of the Balkan Physical Union >UV Light Enhanced Confined Fréedericksz Transition in Photoisomerizable Nematic Nanocomposite with Photoactive Molecules of Azobenzene Nematic Liquid Crystal
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UV Light Enhanced Confined Fréedericksz Transition in Photoisomerizable Nematic Nanocomposite with Photoactive Molecules of Azobenzene Nematic Liquid Crystal

机译：紫外线升高局限于偶氮苯并激素纳米复合材料中的狭窄Fréedericksz过渡，具有偶氮苯的光活性分子

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Based on experimental results, we consider an important feature of the electro-optical (EO) response of nematic liquid crystal (NLC) nanocomposite doped with a photoactive NLC. The basic nanocomposite was NLC with nanosilica fillers. The host compound of the investigated nanocomposite was the nematogen 4-n-heptyl cyanobiphenyl (7CB). This NLC was filled (3 wt.%) with hydrophilic silica nanoparticles (Aerosil 300) of size ~ 7 nm. To obtain a photoresponsive nanofilled NLC, the photo-insensitive aerosil/7CB nanogel was doped (3 wt.%) with azobenzene NLC 4-(4'-ethoxyphenylazo)phenyl hexanoate (EPH). By illumination with UV light at the wavelength of 375 nm, a large reduction of the threshold voltage takes place for the voltage-dependent optical transmittance of thin (25 μm) optical films of the produced EPH-doped aerosil/7CB NLC. The photo-induced depression of the threshold of the LC reorientation upon AC electric field occurs due to trans-cis photoisomerization of EPH molecules that decorate the network of the aerosil/7CB nanogel. The origin and nature of this effect are discussed. Our explanation involves a model consisting of uniform distributed capacitances related to LC domains confined in the gel structure that are connected in series. Based on this model the term Confined Freedericksz Transition (CFT) is coined.
机译：基于实验结果，我们考虑了掺杂用光活性NLC掺杂掺杂型液晶（NLC）纳米复合材料的电光（EO）响应的重要特征。基本纳米复合材料是NlC，纳米硅填料。所研究的纳米复合材料的宿主化合物是Nematrogen 4-N-Heptyl氰基溴脲（7cb）。用大小〜7nm的亲水性二氧化硅纳米粒子（Aerosil 300）填充该NLC（3重量％）。为了获得光响应纳米氧化NLC，用偶氮苯NLC 4-（4'-乙氧基苯基）苯基己酸酯（EPH）掺杂光量敏感的AEROSIL / 7CB纳米凝胶。通过在波长为375nm的UV光照射，对所产生的EPH掺杂Aerosil / 7cb NLC的薄（25μm）光学膜的电压依赖性光学透射率进行阈值电压的大小。由于EPH分子的Trans-CIS光学剂，发生了对AC电场的LC Reorientation的阈值的光诱导的凹陷发生，所述EPH分子装饰了Aerosil / 7cb纳米凝胶网络的NOR-CIS分子。讨论了这种效果的起源和性质。我们的解释涉及由与串联连接的凝胶结构限制的LC域相关的均匀分布电容组成的模型。基于该模型，术语受限于FreederickSz转换（CFT）被卷入。

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