Department of Analytical Chemistry, University of Vienna, Waehringer Strasse 38, A-1090 Vienna, Austria.
Sensors (Basel). 2011;11(9):8611-25. doi: 10.3390/s110908611. Epub 2011 Sep 5.
Conductometric sensors have been fabricated by applying imprinted polymers as receptors for monitoring engine oil quality. Titania and silica layers are synthesized via the sol-gel technique and used as recognition materials for acidic components present in used lubricating oil. Thin-film gold electrodes forming an interdigitated structure are used as transducers to measure the conductance of polymer coatings. Optimization of layer composition is carried out by varying the precursors, e.g., dimethylaminopropyltrimethoxysilane (DMAPTMS), and aminopropyl-triethoxysilane (APTES). Characterization of these sensitive materials is performed by testing against oil oxidation products, e.g., carbonic acids. The results depict that imprinted aminopropyltriethoxysilane (APTES) polymer is a promising candidate for detecting the age of used lubricating oil. In the next strategy, polyurethane-nanotubes composite as sensitive material is synthesized, producing appreciable differentiation pattern between fresh and used oils at elevated temperature with enhanced sensitivity.
通过应用印迹聚合物作为受体，制造了电导传感器，用于监测发动机油的质量。通过溶胶-凝胶技术合成了二氧化钛和硅层，并将其用作检测在用润滑油中存在的酸性成分的识别材料。形成叉指结构的薄膜金电极用作传感器来测量聚合物涂层的电导率。通过改变前驱体（例如二甲基氨基丙基三甲氧基硅烷（DMAPTMS）和氨丙基三乙氧基硅烷（APTES））来优化层组成。通过测试对抗油氧化产物（例如碳酸）来对这些敏感材料进行特性分析。结果表明，印迹的氨丙基三乙氧基硅烷（APTES）聚合物是检测在用润滑油老化程度的有前途的候选材料。在下一步策略中，合成了聚氨酯-纳米管复合材料作为敏感材料，在高温下对新鲜油和用过的油之间产生明显的区分模式，具有更高的灵敏度。
