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- W2477860529 abstract "The utilization of high-resolution electron microscopy and the development of an image analysis system that can provide verifiable and statistically significant results for the characterization of the internal structure of soot particles is an important and necessary step toward the construction of a data base that can show the structure of the carbons which have implication to their properties. A methodology for the characterization has already been elaborated. Quantitative information can be obtained on structural characteristics, e.g. inter-planar spacing, circularity, orientation, elongation and length distribution of lattice fringes as well as the fractional coverage of the extracted pattern. To illustrate the capabilities of the methodology a series of study was performed to examine the effect of oxidation on carbon black. The sample used was CB330 from DeGussa. One set of carbon black was oxidized in a Thermo-Gravimetric Analyzer in air atmosphere at 575 {degrees}C, so that the conversion varied from 0 to 96%. Another set of carbon black sample was graphitized and then oxidized at 680{degrees}C until 92% burnout was reached. Earlier studies found that when examined with a TEM, increasing oxidation of soots results in increased orderliness of structure. That is, the partial oxidation allows the carbon atoms tomore » relax toward the thermodynamically favored graphitic state. Results from our analysis support this argument. There is a slight but monotonic decrease in the mean values of the characteristic inter-planar spacing. The same trend can be observed in the standard deviation values. Both results show that the internal structure of the soot particles becomes more ordered as the oxidation proceeds.« less" @default.
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- W2477860529 date "1995-12-31" @default.
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- W2477860529 title "Effect of oxidation on the internal structure of carbon black particles" @default.
- W2477860529 hasPublicationYear "1995" @default.
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