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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS March Meeting 2017 - Event - Optics of Confined Liquid Crystals for Gas Detection
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APS -APS March Meeting 2017 - Event - Optics of Confined Liquid Crystals for Gas Detection

机译：APS -APS 2017年3月会议-活动-用于气体检测的受限液晶光学

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Cholesteric liquid crystals (CLCs) of a wide range of viscosities were studied experimentally in relation to their use as gas sensors and sensors of volatile organic compounds (VOCs), specifically ethanol, cyclohexane, toluene, acetic acid, and pyridine. CLCs were obtained by mixing low molar mass liquid crystals (MBBA and cholesterol derivatives with siloxane based oligomers). The droplets of CLCs were placed in containers with controlled atmospheres. The shift of the selective reflection band, predominantly from shorter to longer wavelengths, and the color changes were observed in the CLC illuminated by light coming from the various directions. Visible optical changes were observed in droplets with viscosities of CLCs ranging from c.a. 4 Pa*s to 10$^5$ Pa*s. The most responsive droplets in which the shift of the selective reflection band occurs at lower concentrations of VOCs were prepared from CLC mixtures with the lowest viscosities. Higher viscosities of CLCs lead to a slower response to VOCs, but the rate of response is different for each pair of VOC and CLC with a certain viscosity. This finding opens a possibility for selective detection of VOCs by CLCs with different viscosities. The mechanism of VOCs diffusion, interaction with CLC matrix and optical changes is discusse
机译：就其用作气体传感器和挥发性有机化合物（VOC）（特别是乙醇，环己烷，甲苯，乙酸和吡啶）的传感器进行实验研究了各种粘度的胆甾型液晶（CLC）。通过混合低摩尔质量的液晶（MBBA和胆固醇衍生物与硅氧烷基低聚物）获得CLC。将CLC的液滴放置在具有受控气氛的容器中。在由来自各个方向的光照射的CLC中，观察到选择性反射带的变化，主要是从较短的波长到较长的波长，以及颜色变化。在液滴中观察到可见的光学变化，其CLC的粘度范围为c.a.。 4 Pa * s至10 $ ^ 5 $ Pa * s。由具有最低粘度的CLC混合物制备了响应性最强的液滴，其中在较低的VOC浓度下发生了选择性反射带的移动。 CLC的较高粘度会导致对VOC的响应变慢，但是对于具有一定粘度的每对VOC和CLC，响应速度都不同。该发现为通过具有不同粘度的CLC选择性检测VOC提供了可能性。讨论了VOCs扩散，与CLC基质相互作用以及光学变化的机理。

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