Comparative nanostructure analysis of gasoline turbocharged direct injection and diesel soot-in-oil with carbon black
Comparative nanostructure analysis of gasoline turbocharged direct injection and diesel soot-in-oil with carbon black
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DOI：
10.1016/j.carbon.2018.06.050
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发表时间：
2018-11-01
期刊：
影响因子：
10.9
通讯作者：
Malizia, S.
中科院分区：
文献类型：
--
作者：
Pfau, S. A.;La Rocca, A.;Malizia, S.
两个汽油涡轮增压直喷（GTDI）和柴油碳烟在油中的样品进行了比较，一个火焰产生的碳烟样品。采用高分辨率透射电子显微镜成像对烟灰形态进行初步定性评估。炭黑和柴油烟灰都表现出核-壳结构，包括被石墨烯层包围的无定形核;只有柴油烟灰具有多核颗粒。除了这样的颗粒，GTDI烟灰还表现出完全无定形的结构，其中一些包含直径仅为几纳米的结晶颗粒。随后通过条纹分析对纳米结构进行定量，表明样品之间在石墨条纹的长度、弯曲度和分离方面存在差异。GTDI样品的条纹最短，而柴油机烟灰和炭黑的条纹分别长9.7%和15.1%。条纹弯曲度在内燃机样品中是相似的，但对于炭黑样品较低。相反，条纹分离在样品之间连续变化。拉曼光谱进一步证实了观察到的差异。GTDI烟灰样品含有最高分数的无定形碳和有缺陷的石墨结构，其次分别是柴油烟灰和炭黑。Am：A G比值与条纹长度和条纹间距均呈线性相关。(C)2018作者爱思唯尔有限公司出版
Two gasoline turbocharged direct injection (GTDI) and two diesel soot-in-oil samples were compared with one flame-generated soot sample. High resolution transmission electron microscopy imaging was employed for the initial qualitative assessment of the soot morphology. Carbon black and diesel soot both exhibit core-shell structures, comprising an amorphous core surrounded by graphene layers; only diesel soot has particles with multiple cores. In addition to such particles, GTDI soot also exhibits entirely amorphous structures, of which some contain crystalline particles only a few nanometers in diameter. Subsequent quantification of the nanostructure by fringe analysis indicates differences between the samples in terms of length, tortuosity, and separation of the graphitic fringes. The shortest fringes are exhibited by the GTDI samples, whilst the diesel soot and carbon black fringes are 9.7% and 15.1% longer, respectively. Fringe tortuosity is similar across the internal combustion engine samples, but lower for the carbon black sample. In contrast, fringe separation varies continuously among the samples. Raman spectroscopy further confirms the observed differences. The GTDI soot samples contain the highest fraction of amorphous carbon and defective graphitic structures, followed by diesel soot and carbon black respectively. The Am:A G ratios correlate linearly with both the fringe length and fringe separation. (C) 2018 The Authors. Published by Elsevier Ltd.