共查询到19条相似文献,搜索用时 171 毫秒
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尼古丁印迹聚合物分子识别特性的光谱研究 总被引:1,自引:0,他引:1
以尼古丁为模板分子,甲基丙烯酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂,合成尼古丁分子印迹聚合物。采用紫外光谱和1H核磁共振波谱研究了该印迹聚合物的结合位点和识别机理。结果表明,该聚合物中尼古丁与甲基丙烯酸通过协同氢键作用形成1:2型配合物。甲基丙烯酸分子中羧基氢原子是氢键的质子给予体;尼古丁分子吡啶环和四氢吡咯环上的两个氮原子是接受质子的识别位点。该印迹聚合物通过协同氢键作用选择性的识别尼古丁分子。 相似文献
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分子印迹技术是制备具有特异预定选择性的高分子化合物——分子印迹聚合物的技术,也是当前分析化学领域研究的热点。该技术是模仿钥匙的原理,即在印迹分子(模板)存在的条件下,在模板周围合成特定聚合物,之后将模板移出,形成特定孔穴。它具有高选择性、分子识别、可具有针对性设计等特点,表现出较高的应用潜力。在标准物质定值当中多组分分离、痕量组分富集是研究的难点,而这却是分子印迹技术的优势,因而分子印迹技术在标准物质定值工作中具有很高的应用价值。 相似文献
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以甲基羟基膦酸异丙酯酸为模板分子,β-环糊精巯基衍生物单[6-脱氧(1,10癸二硫醇)巯基]β-环糊精在声表面波(Surface Acoustic Wave,SAW)金延迟线上进行自组装,制备出能够对有机膦类化合物(organphospho-rus compounds)进行选择性检测的分子印迹薄膜.通过电化学阻抗和原子力显微镜的方法表征了自组装膜的形成,并对甲基膦酸二甲酯(dimethyl methylphosphorate,DMMP)进行了检测,证实了分子印迹效果. 相似文献
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分子印迹电化学传感器研究最新进展 总被引:1,自引:0,他引:1
熊力 《气象水文海洋仪器》2009,26(4):172-175,178
分子印迹聚合物对目标化合物具有高选择性,并且具有耐高温、抗酸碱及有机溶剂等优点。分子印迹技术在催化、手性分离、固相萃取等许多领域都得到了广泛的应用。分子印迹聚合物用作传感器的敏感材料是分子印迹技术近年来的研究热点。本文介绍了分子印迹电化学传感器的制备方法,并就分子印迹电化学传感器研究最新进展及应用作一综述。 相似文献
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开发了一种多孔分子印迹膜修饰的表面等离子体共振(SPR)传感器,用于快速检测水中微囊藻毒素LR。研究了利用该传感器检测微囊藻毒素LR的方法。首先,通过原位聚合法在SPR传感芯片的裸金表面合成了微囊藻毒素LR的多孔分子印迹膜,制备出可以特异性捕获微囊藻毒素LR的SPR传感芯片。然后,利用Kretschmann棱镜耦合结构,构建了基于Kretschmann结构的波长调制型表面等离子体共振传感器。最后,通过检测不同浓度的微囊藻毒素LR溶液以及干扰物质微囊藻毒素RR溶液,研究了该传感器的测量范围、特异性等参数。结果表明,该传感器对于微囊藻毒素LR的检测灵敏度很高,可实现微囊藻毒素LR的定量检测,动态测量达2.1×10-9~1×10-6 mol/L。另外,传感器对于干扰物质微囊藻毒素RR无明显信号响应,表明传感器对于微囊藻毒素LR具有很好的特异性检测能力。 相似文献
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Abstract This paper describes some of our recent advances and proposed future work in the area of fluorimetric determination of Al using sequential injection analysis (SIA). A rapid, automated system was developed with turnover times for sample analysis of <2 min, and attainable limits of detection of <1 ng/mL. The method is cost‐effective and highly competitive. It utilizes three different approaches: (i) molecular imprinted polymers (MIPs); (ii) micellar enhanced treatment; and (iii) renewable surface application. The merits and limitations of each approach are discussed, and the optimum conditions of analysis are presented. The overall sensitivity achieved was more than adequate for general analysis. Proposed new developments involve greater signal enhancement, and improved analytical strategy. The facility is capable of routine application, and is highly beneficial to developing countries in need of cost‐effective techniques for analysis of environmental samples, body fluids, and foodstuffs. 相似文献
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A complex of lanthanum and di-(2-ethyl hexyl) phosphate (DEHP) was prepared by an extractive method. The friction and wear behaviour of this complex (called LaDEHP) as an oil additive was evaluated using a four-ball wear tester. For comparison, the friction reduction and antiwear properties of DEHP as an oil additive were also investigated. The chemical composition of the boundary film formed after wear tests was examined using X-ray photoelectron spectrometry (XPS). Four-ball tests showed that the prepared LaDEHP was effective in reducing friction and wear as well as in increasing load-carrying capacity. XPS analyses indicate the formation of iron phosphate and lanthanum oxide in the boundary films. 相似文献
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利用自组装技术将3-巯基丙基三乙氧基硅烷薄膜沉积在单面抛光的单晶硅基片上.用X射线光电子能谱仪测量薄膜的化学成分;用原子力显微镜(AFM)观察薄膜表面形貌;用接触角测量仪测量薄膜的接触角;在摩擦试验机上考察薄膜的摩擦学性能与接触角之间的关系.结果表明:薄膜的接触角随着组装时间的增加先增加后减小然后再增加,表明MM分子在单晶硅基片上的自组装是逐层进行的,当MM完成一层组装时,其薄膜表面自由能较低,所表现出的接触角较大;薄膜的摩擦磨损性能与接触角成对应关系,接触角增大,摩擦因数减小,抗磨损能力提高. 相似文献
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Study of the Conductivity and Tribological Performance of Ionic Liquid and Lithium Greases 总被引:1,自引:0,他引:1
Xiaoqiang Fan Yanqiu Xia Liping Wang Jibin Pu Tiedan Chen Haobo Zhang 《Tribology Letters》2014,53(1):281-291
Ionic liquid (IL) lubricating greases were prepared using 1-hexyl-3-methylimidazolium tetrafluoroborate and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl) amide as base oil and polytetrafluoroethylene (PTFE) as thickener, respectively. Three kinds of lithium greases were also prepared using lithium ILs ([Li(PAG)]X) as base oil and PTFE as thickener. 1-Ethyl-3-methyl imidazolium hexafluorophosphate as an additive was added to the PAG grease, which was prepared using polyalkylene glycol monobutyl ether (PAG) as base oil and PTFE as thickener. The conductivities and tribological properties of the prepared lubricating greases were investigated in detail. Scanning electron microscopy and X-ray photoelectron spectroscopy were employed to explore the friction and wear mechanism. The results showed that the IL and lithium lubricating greases have conductivities and excellent tribological properties. Especially, IL greases have the highest conductivity. The excellent tribological properties are attributed to the formation of boundary films consisting of both tribo-chemical reaction films and physical absorption films, while high conductivities are attributed to the intrinsic electric fields of the ILs. 相似文献