The results indicate that polyaniline as the active transducer is a highly promising material for sensing the condition ot hydrocarbon-based fluids, both in the presence and the absence of water. Water can be an interfering impurity in measuring the acid content of these fluids, paticularly when trying to measure the increase of electroactive polar species. Water tends to dissolve and coagulate these species, which effectively removes them from the medium and hence their buildup is not detected. The polyaniline devices described here do in fact detect and measure water in the presence of hydrocarbon-based fluids, and also effectively sense the buildup of acid species, even in the presence of water. Calibration of the device for acid content can yield a device for quantitative measurement in both lubricating oils and transmission fluids. Similarily, poly(3-methylthiophene) appears to be a promising candidate as the transducer material for sensors measuring the alcohol content in hydrocarbon based solutions.
Automotive applications of conductive polymer-based chemical sensors
Anwendung von leitfähigen chemischen Sensoren auf der Grundlage von Polymerwerkstoffen im Kraftfahrzeugbereich
Sensors Expo, 1994 ; 509-513
1994
5 Seiten, 4 Bilder, 1 Tabelle, 17 Quellen
Conference paper
English
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