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纳米石墨烯润滑油对柴油机颗粒物的影响。

Effect of nano-graphene lubricating oil on particulate matter of a diesel engine.

作者信息

Kuang Xin, Yang Xiping, Fu Hao, Li Shengyong, Bian Hua

机构信息

School of Traffic Engineering, Jiangsu Shipping College, Nantong, 226010, China.

School of Intelligent Manufacturing and Information, Jiangsu Shipping College, Nantong, 226010, China.

出版信息

Sci Rep. 2024 May 11;14(1):10797. doi: 10.1038/s41598-024-61694-z.

DOI:10.1038/s41598-024-61694-z
PMID:38734735
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11088659/
Abstract

Nano-graphene lubricating oil with appropriate concentration shows excellent performance in reducing friction and wear under different working conditions of diesel engines, and has been widely concerned. Lubricating oil has a significant impact on particulate matter (PM) emissions. At present, there are few studies on the impact of nano-graphene lubricating oil on the physicochemical properties of PM. In order to comprehensively evaluate the impact of nano-graphene lubricating oil on diesel engines, this paper mainly focused on the effects of lubricating oil nano-graphene additives on the particle size distribution and physicochemical properties of PM. The results show that, compared with pure lubricating oil, the total number of nuclear PM and accumulated PM of nano-graphene lubricating oil is significantly increased. The fractal dimension of PM of nano-graphene lubricating oil increases and its structure becomes more compact. The average fringe separation distance of basic carbon particles decreases, the average fringe length increases. The degree of ordering and graphitization of basic carbon particles are higher. The fringe tortuosity of basic carbon particles decreases, and the fluctuation of carbon layer structure of basic carbon particles decreases. Aliphatic substances in PM are basically unchanged, aromatic components and oxygen functional groups increase. The initial PM oxidation temperature and burnout temperature increase, the maximum oxidation rate temperature and combustion characteristic index decrease, and the activation energy increases, making it more difficult to oxidize. This was mainly caused by the higher graphitization degree of PM of nano-graphene lubricating oil and the increased content of aromatic substances.

摘要

适当浓度的纳米石墨烯润滑油在柴油机不同工况下表现出优异的减摩抗磨性能，受到广泛关注。润滑油对颗粒物（PM）排放有显著影响。目前，关于纳米石墨烯润滑油对PM理化性质影响的研究较少。为全面评估纳米石墨烯润滑油对柴油机的影响，本文主要聚焦于润滑油纳米石墨烯添加剂对PM粒径分布和理化性质的影响。结果表明，与纯润滑油相比，纳米石墨烯润滑油的核态PM总数和积聚态PM总数显著增加。纳米石墨烯润滑油PM的分形维数增大，结构变得更加致密。基本碳颗粒的平均条纹间距减小，平均条纹长度增加。基本碳颗粒的有序化程度和石墨化程度更高。基本碳颗粒的条纹曲折度减小，基本碳颗粒碳层结构的波动减小。PM中的脂肪族物质基本不变，芳香族成分和氧官能团增加。PM的初始氧化温度和燃尽温度升高，最大氧化速率温度和燃烧特性指数降低，活化能增加，使其更难氧化。这主要是由纳米石墨烯润滑油PM的较高石墨化程度和芳香族物质含量增加所致。

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