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8 - Chemical Nucleation

Published online by Cambridge University Press:  30 May 2024

Steven L. Girshick
Affiliation:
University of Minnesota
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Summary

Chemical nucleation involves cluster growth by chemical reactions. In the case where clusters grow via a simple sequence of reversible chemical reactions, a summation expression for the steady-state nucleation rate can be derived. However, in many cases the chemical pathway to cluster growth is more complicated, and requires solving a set of species population balance equations that depend on the specific chemical system. Two examples are considered: soot nucleation in hydrocarbon combustion and nucleation of silicon particles in thermal decomposition of silane. In both cases, chemical kinetic mechanisms have been developed that allow for numerical simulations of particle formation. Soot nucleation is believed to proceed through the formation of polycyclic aromatic hydrocarbons. Models have been developed for the formation of the first aromatic ring and for subsequent growth, either through reaction with small molecules or by coagulation. Silicon nucleation from silane involves a large set of silicon hydride species, which can be grouped into classes according to their structure and reactivity, facilitating estimates of their free energies and reaction rate constants.

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Publisher: Cambridge University Press
Print publication year: 2024

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  • Chemical Nucleation
  • Steven L. Girshick, University of Minnesota
  • Book: Nucleation of Particles from the Gas Phase
  • Online publication: 30 May 2024
  • Chapter DOI: https://doi.org/10.1017/9781139028851.009
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  • Chemical Nucleation
  • Steven L. Girshick, University of Minnesota
  • Book: Nucleation of Particles from the Gas Phase
  • Online publication: 30 May 2024
  • Chapter DOI: https://doi.org/10.1017/9781139028851.009
Available formats
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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Chemical Nucleation
  • Steven L. Girshick, University of Minnesota
  • Book: Nucleation of Particles from the Gas Phase
  • Online publication: 30 May 2024
  • Chapter DOI: https://doi.org/10.1017/9781139028851.009
Available formats
×