Studying the Effects of in-Cabin Decoration and Deodorizer on Interior Concentrations of Toluene and Ethyl Benzene in Logan 90 Cars

Background & Objectives: Exposure to different chemical compounds such as toluene and ethyl benzene occurs in workplaces, residency, and urban areas. Currently, vehicle cabin environment is one of the new exposure sources of passengers to these compounds. This study aimed to evaluate the effects of in-cabin decoration and deodorizer use on interior concentrations of toluene and ethyl benzene in Logan cars. Methods: Samples were collected using activated carbon absorption and low-flow sampling pumps in a roofed parking of 44 “Logan 90” cars and analyzed with gas chromatography along with mass detector. Results: The mean concentration of toluene (42.02 μg/m3) was higher than ethyl benzene (17.44 μg/m3) in vehicles. The mean concentrations of toluene and ethyl benzene in cars without decoration were 13.84 and 11.24 μg/m3, respectively and in cars with seat cover were 49.09 and 14.35 μg/m3, respectively. Conclusion: The results showed that vehicle age had no significant effect on the concentration of these substances; however, non-used vehicles had significantly higher concentrations of these substances. Decoration and deodorizer use had no significant effect on the concentration of toluene and ethyl benzene in car

Influence of Gr and MoS2 Particles on High Temperature Tribological Properties of Ni-SiC Composite Coating

Ni–SiC composite coatings are successfully employed as a protective coating in the inner walls of engine cylinders. In this study, Ni-SiC, Ni-SiC-MoS2 and Ni-SiC-Gr composite coatings were prepared from a sulfamate bath. Both mechanical and ultrasonic stirring were used simultaneously during the process. Taking into account the working temperature of engine cylinders, the wear behavior of coatings was evaluated at 25 to 300 ºC and the high temperature tribological properties of the coatings were investigated. Based on the results obtained from the wear tests, all three coatings showed almost good friction coefficient values at 25 and 100 ºC, which were close to each other. By increasing the temperature to 200-300 °C, the friction coefficient and weight loss values strongly increased. However, addition of solid lubricants caused the values to decrease. The Ni-SiC-Gr coating at all temperatures showed a good and stable behavior