《Table 1 Physical and chemical properties of biodiesel and liquid paraffin》

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《Effect of Biodiesel Soot on Tribological Behavior of Liquid Paraffin》

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Biodiesel was made from soybean oil via transesterification with methanol over the self-made green biomass ash catalyst[13].Table 1 shows the physical and chemical properties of biodiesel.Biodiesel soot（BDS）was collected using a self-made soot trap from the combustion of biodiesel[12].The collection of BDS comprised the following steps.Biodiesel was burned out in a porcelain crucible at normal temperature and atmospheric pressure.A glass slide（soot capture slide）was held above the flame of biodiesel until a soot layer with a few micrometers in thickness was deposited[14].This soot layer was then scraped off from the slide and was very carefully cleaned and collected in a glass bottle.Finally the collected soot was dried under a vacuum condition at 120°C for 3 h and was ground to become a fine granular powder.LP was purchased from the Hengshui Diyi Petroleum Chemical Co.，Ltd.in China，with its physical and chemical properties shown in Table 1.The individual oil samples were composed of:LP+1%of BDS，LP+2%of BDS，LP+3%of BDS，LP+4%of BDS，and LP+5%of BDS，respectively.The oil samples were stirred using a glass rod for 15 min.Finally，the oil samples were prepared under continuous magnetic stirring for 1 h to reduce experimental deviation.