Detection of organophosphorous nerve agents using liquid crystals supported on chemically functionalized surfaces
Detection of organophosphorous nerve agents using liquid crystals supported on chemically functionalized surfaces
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DOI：
10.1016/j.snb.2007.05.044
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发表时间：
2007-12-12
影响因子：
8.4
通讯作者：
Abbott, Nicholas L.
中科院分区：
文献类型：
--
作者：
Cadwell, Katie D.;Lockwood, Nathan A.;Abbott, Nicholas L.
我们报告了使用的薄膜的E7液晶支持在化学功能化的表面，以表明存在的蒸气的有机磷神经毒剂沙林（GB），梭曼（GD），塔崩（GA）和VX的表面上的金属高氯酸盐的沉积到羧酸封端的自组装单分子膜。当使用由高氯酸铝盐制备的表面时，E7的氧化膜在暴露于GB、GD、GA或VX的蒸气时经历从垂直取向到倾斜或平面取向的转变，所述蒸气由放置在一张滤纸上的小滴试剂产生。液晶的取向转变作为肉眼可见的光学信号是显而易见的。VX剂，它具有这些有机磷神经毒剂中最低的蒸汽压（类似于140 ppb），在60秒内被液晶报告。具有较高蒸气压的试剂GB、GD和GA分别在15 s、15 s和60 s内触发液晶中明显的响应。通过从铝（III）、锌（II）和铁（III）的高氯酸盐制备表面，有可能区分GB、VX和GD或GA，从而证明设计用金属盐图案化的表面以检测和积极识别化学战剂的可行性。(c)2007 Elsevier B.V.保留所有权利。
We report use of thin films of the nematic liquid crystal E7 supported on chemically functionalized surfaces to indicate the presence of vapors of the organophosphorous nerve agents sarin (GB), soman (GD), tabun (GA) and VX The surfaces were prepared by the deposition of metal perchlorate salts onto carboxylic acid-terminated self-assembled monolayers. When using surfaces prepared from aluminum perchlorate salts, the nematic film of E7 underwent a transition from a perpendicular orientation to a tilted or planar orientation upon exposure to vapors of GB, GD, GA or VX generated from a small drop of agent placed on a piece of filter paper. The orientational transition of the liquid crystal was readily apparent as an optical signal that was visible to the naked eye. The agent VX, which has the lowest vapor pressure of these organophosphorous nerve agents (similar to 140 ppb), was reported by the liquid crystal within 60 s. The agents GB, GD, and GA, which have higher vapor pressures, triggered responses in the liquid crystal that were evident within 15 s, 15 s, and 60 s, respectively. By preparing surfaces from perchlorate salts of aluminum(III), zinc(II) and iron(III) it was possible to distinguish between GB, VX and either GD or GA, thus demonstrating the feasibility of designing surfaces patterned with metal salts to detect and positively identify chemical warfare agents. (c) 2007 Elsevier B.V. All rights reserved.