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http://dx.doi.org/10.9725/kstle.2004.20.6.343

An Experimental Study for the Minimization of Soot Adsorption on the Optical Surface of an Engine Soot Detector (I)  

Yoon Eui-Sung (Tribology Research Center, KIST)
Kim Hak-Yal (Tribology Research Center, KIST)
Kong Hosung (Tribology Research Center, KIST)
Han Hung-Gu (Tribology Research Center, KIST)
Publication Information
Tribology and Lubricants / v.20, no.6, 2004 , pp. 343-349 More about this Journal
Abstract
The adsorption of soot particles onto a sensor surface of the engine soot detector posses a critical problem in the measurement. In order to prevent the optical rod surface from soot contamination, various functional coatings and flow-induced cleaning were applied to the surface in this work. For surface coatings, various materials of self-assembled monolayers (SAM) such as OTS (octadecyltrichlorosilane), PFDTES (perfluorodecyl-triethoxysilane) and PFDTMS (perfluorodecyltrimethoxysilane) were coated on the optical rod surface ,which have different characteristics in both hydrophobicity and oleophobicity. These coatings were tested with soot content varying from $0\%\;to\;3wt\%$ and oil temperature from 20 to $70^{\circ}C$. Test results showed that surface coatings were not effective for preventing the adsorption of soot panicles on the surface of optical rod. It was thought that these coatings provided the surface with additional attractive surface forces. However, it was found that adsorption of soot particles onto a sensor surface was minimized by flow-induced cleaning. This effect was tested with varying the flow velocity.
Keywords
engine soot; soot detector; surface coating; adsorption; flow-induced cleaning;
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