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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Influence of combustion conditions on hydrophilic properties and microstructure of flame soot
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Influence of combustion conditions on hydrophilic properties and microstructure of flame soot

机译：燃烧条件对火焰烟灰亲水性和微观结构的影响

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摘要

Previous studies suggest that structure and reactivity of soot depend on combustion conditions like the fuel/oxygen ratio and nature of fuels. However, the essence of how combustion conditions affect physical and chemical properties of soot is still an open question. In this study, soot samples were prepared by combusting toluene, n-hexane, and decane under controlled conditions, and their hydrophilic properties, morphology, microstructure, content of volatile organic compounds, and functional groups were characterized. The hydrophilicity of n-hexane and decane flame soot increased with decreasing fuel/oxygen ratio, while it almost did not change for toluene flame soot. Fuel/oxygen ratio had little effect on the morphology of aggregates and the graphite crystallite size. The primary particle size and the content of volatile organic compounds on soot decreased with decreasing fuel/oxygen ratio. Less hydrophobic groups (C-H) and more hydrophilic groups (C=O) were observed on lean n-hexane and decane flame soot than that on the corresponding rich flame soot. Volatile organic compounds had little effect on the hydrophilicity of soot while the hydrophilicity correlated linearly with the ratio of C=O content to C-H content. The hydrophilic functional groups were found to be mainly located at graphene layer edges and on surface graphene layers in soot.
机译：先前的研究表明，烟灰的结构和反应性取决于燃烧条件，例如燃料/氧气的比例和燃料的性质。但是，燃烧条件如何影响烟灰的物理和化学性质的本质仍然是一个悬而未决的问题。在这项研究中，通过在受控条件下燃烧甲苯，正己烷和癸烷来制备烟灰样品，并对其亲水性，形态，微观结构，挥发性有机化合物的含量和官能团进行了表征。正己烷和癸烷烟灰的亲水性随燃料/氧气比的降低而增加，而对于甲苯烟灰则几乎不变。燃料/氧气比对聚集体的形态和石墨微晶尺寸几乎没有影响。随着燃料/氧气比的降低，烟灰中的初级粒径和挥发性有机化合物的含量降低。在稀正己烷和癸烷火焰灰上观察到的疏水基团（C-H）较少，而亲水基团（C = O）在相应的浓火焰灰上观察到的较少。挥发性有机化合物对烟灰的亲水性影响很小，而亲水性与C = O含量与C-H含量之比呈线性关系。发现亲水性官能团主要位于烟灰中的石墨烯层边缘和表面石墨烯层上。

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