科研之友
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摘要
In this study, it is reported the fractal dimension and morphology of ultrafine particles emitted by a diesel engine run with B4, B50, and B100. Transmission electron micrographs evidenced two main groups of particles with characteristic and distinct morphological behaviors: (i) particle agglomerate structures self-organized within a fractal-like geometry, and (ii) amorphous and irregular particles with diffuse edges in a liquid-like particle appearance, mainly associated with some sub-fractions of samples collected from B50 and B100 combustion. Particles from (i) showed typical diesel soot morphology and fractal dimension. Primary particle diameter (D-pp) was 24 +/- 4 nm, 23 +/- 4 nm, and 20 +/- 4 nm for B4, B50, and B100, respectively. Mean aggregate gyration diameters (D-g) ranged from 242 +/- 140 nm for B4, 210 +/- 135 nm for B50, and to 232 +/- 140 nm for B100. In turn, fractal dimensions (D-f) were 1.94, 1.89, and 1.99 for B4, B50, and B100, respectively. On the other hand, particle from (ii) had their morphology impaired from the addition of biodiesel to petrodiesel in a way it did not follow a fractal geometry.
- 出版日期2017
