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Structural Changes of Soot Particulates as Shown by HRTEM and Image Analysis

Published online by Cambridge University Press:  02 July 2020

Árpád B. Palotás ,
David C. Bell ,
Lenore C. Rainey  and
John B. Vander Sande
Árpád B. Palotás
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139
David C. Bell
Affiliation:
Center for Materials Science and Engineering, Massachusetts Institute of Technology77 Massachusetts Avenue, Cambridge, MA, 02139
Lenore C. Rainey
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139
John B. Vander Sande
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139
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It has long been known that carbons have order at the microcrystalline level. Soots have been characterized as having a turbostratic structure and chars have been described as crumpled sheets. The value of electron microscopy in studying the morphology of such materials has been well established although only a few attempts have been made toward quantification.

The Methodology is based upon High Resolution Transmission Electron Microscopy (HRTEM) and further image analysis. The HRTEM image of each sample is recorded, digitized and processed with an image analysis software. Computer generated diffractograms are produced through Fourier Transformation and subsequent reverse transformation yields two color ‘extracted structures’ (Figure 1). The extracted structure is then undergoes statistical analysis. The analysis is aimed at identifying quantifiable structural parameters. Currently the following parameters are studied: circularity (C), elongation (E), and length of fringes (La) orientation of the fringes (cti), the inter-layer spacing (d002), and the fractional coverage of the extracted pattern (F).

Type
Microscopy and Microanalysis in the “Real World”
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 504 - 505
Copyright
Copyright © Microscopy Society of America

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References

References:

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5. The Center for Materials Science and Engineering is a Materials Research Science Center sponsored by the National Science Foundation. The research was also supported by the EPA Center on Airborne OrganicsGoogle Scholar