Photophoresis and the scattering of electromagnetic radiation

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Description

Electron-microscope photographs of soot lend support to the picture in which a soot particle is modeled as a collection of chains of small carbon spheres. The soot particle itself is typically considerably larger than the small carbon spheres making up the chains. Thus the soot particles might have a size approx.0.1 - 1 ..mu..m while the small carbon spheres might have a size approx.0.03 ..mu..m in typical situations. Further, measurements of the density of soot yield values much less than that of normal carbon, indicating that an individual soot particle has a rather small filling factor, i.e., the fraction of ... continued below

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Pages: 12

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Ipser, J.R. September 1, 1985.

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Description

Electron-microscope photographs of soot lend support to the picture in which a soot particle is modeled as a collection of chains of small carbon spheres. The soot particle itself is typically considerably larger than the small carbon spheres making up the chains. Thus the soot particles might have a size approx.0.1 - 1 ..mu..m while the small carbon spheres might have a size approx.0.03 ..mu..m in typical situations. Further, measurements of the density of soot yield values much less than that of normal carbon, indicating that an individual soot particle has a rather small filling factor, i.e., the fraction of the volume of the particle tht is occupied by chains. If a soot particle is taken to be a sphere partially filled with carbon chains, what are its scattering and absorption properties. Several workers have adopted the view that the net scattering and absorption properties can be determined simply by summing the cross-sections for the individual small carbon spheres. We feel that such a procedure cannot be valid in general because it neglects coherence effects among the various randomly located scatterers within the soot particle. It appears that in a first rough approximation the scattering and absorption properties of soot can be determined by estimating the effective dielectric constant of a soot sphere.

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Pages: 12

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NTIS, PC A02/MF A01.

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  • Other: DE86001687
  • Report No.: UCID-20541
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/5014312 | External Link
  • Office of Scientific & Technical Information Report Number: 5014312
  • Archival Resource Key: ark:/67531/metadc1056188

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Creation Date

  • September 1, 1985

Added to The UNT Digital Library

  • Jan. 22, 2018, 7:23 a.m.

Description Last Updated

  • Jan. 31, 2018, 6:34 p.m.

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Ipser, J.R. Photophoresis and the scattering of electromagnetic radiation, report, September 1, 1985; California. (digital.library.unt.edu/ark:/67531/metadc1056188/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.