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Conductometric Sensors for Monitoring Degradation of Automotive Engine Oil†
Department of Analytical Chemistry, University of Vienna, Waehringer Strasse 38, A-1090 Vienna, Austria
† Dedicated to Professor Dr. Adolf Neckel on the occasion of his 85th birthday.
* Author to whom correspondence should be addressed.
Received: 16 July 2011; in revised form: 31 August 2011 / Accepted: 1 September 2011 / Published: 5 September 2011
Abstract: 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.
Keywords: conductometric sensors; engine oil; imprinted polymers; carbon nanotubes; polyurethane
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MDPI and ACS Style
Latif, U.; Dickert, F.L. Conductometric Sensors for Monitoring Degradation of Automotive Engine Oil. Sensors 2011, 11, 8611-8625.
Latif U, Dickert FL. Conductometric Sensors for Monitoring Degradation of Automotive Engine Oil. Sensors. 2011; 11(9):8611-8625.
Latif, Usman; Dickert, Franz L. 2011. "Conductometric Sensors for Monitoring Degradation of Automotive Engine Oil." Sensors 11, no. 9: 8611-8625.