Preparation, Characterization and Water-based Lubricity of Modified Biodiesel Soot †

doi:10.7503/cjcu20190668

Abstract

Abstract:

In order to realize the utilization of biodiesel soot(BDS) as lubricant additives in water, thermally oxidized biodiesel soot(TO-BDS) was prepared by thermal oxidation. The morphology, composition and dispersion of TO-BDS were analyzed by field-emission transmission electron microscopy, X-ray photoelectron spectroscopy and zeta potentiostat, and compared with that of BDS. The tribological properties and the lubricant mechanism of TO-BDS as an additive in water were investigated using a ball-on-disc reciprocating tribometer, 3D laser scanning microscopy, field-emission scanning electron microscopy, optical contact angle/interface tension meter and Raman spectrometer. Results indicate that the oxygen-containing functional groups and negative charges of TO-BDS are more than that of BDS, which leads to better dispersion of TO-BDS in water compared with BDS in water. The anti-friction and anti-wear properties are significantly improved after adding 0.2%(mass fraction) TO-BDS in water. The main reason is that TO-BDS can act as bearing during friction process and water containing TO-BDS is more facile than water to form lubricating film because the friction pairs are more wettable for water containing TO-BDS in comparison with water. Besides, it also can reduce friction and wear due to friction induced the exfoliating graphitic sheets of TO-BDS.

Key words: Biodiesel, Soot, Thermal oxidation, Lubricity, Additive

CLC Number:

O611
O613

TrendMD:

LI Chuan,WANG Xinyun,WU Fengyi,LIU Tianxia,HU Xianguo. Preparation, Characterization and Water-based Lubricity of Modified Biodiesel Soot ^†[J]. Chem. J. Chinese Universities, 2020, 41(5): 987.

Figures/Tables 10

References 36

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Soot sample	Molar fraction of oxygen group(%)
Soot sample	C—OH	C—O—C, C＝O
BDS	4.90	2.89
TO-BDS	11.43	6.14

Soot sample	Molar fraction of oxygen group(%)
Soot sample	C—OH	C—O—C, C＝O
BDS	4.90	2.89
TO-BDS	11.43	6.14