Effects of volatile coatings on the morphology and optical detection of combustion-generated black carbon particles.

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Description

We have measured time-resolved laser-induced incandescence (LII) from combustion-generated mature soot extracted from a burner and (1) coated with oleic acid or (2) coated with oleic acid and then thermally denuded using a thermodenuder. The soot samples were size selected using a differential mobility analyser and characterized with a scanning mobility particle sizer, centrifugal particle mass analyser, and transmission electron microscope. The results demonstrate a strong influence of coatings particle morphology and on the magnitude and temporal evolution of the LII signal. For coated particles higher laser fluences are required to reach LII signal levels comparable to those of uncoated ... continued below

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53 p.

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Bambha, Ray P.; Dansson, Mark Alex; Schrader, Paul E. & Michelsen, Hope A. September 1, 2013.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
    Place of Publication: Livermore, California

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Description

We have measured time-resolved laser-induced incandescence (LII) from combustion-generated mature soot extracted from a burner and (1) coated with oleic acid or (2) coated with oleic acid and then thermally denuded using a thermodenuder. The soot samples were size selected using a differential mobility analyser and characterized with a scanning mobility particle sizer, centrifugal particle mass analyser, and transmission electron microscope. The results demonstrate a strong influence of coatings particle morphology and on the magnitude and temporal evolution of the LII signal. For coated particles higher laser fluences are required to reach LII signal levels comparable to those of uncoated particles. This effect is predominantly attributable to the additional energy needed to vaporize the coating while heating the particle. LII signals are higher and signal decay rates are significantly slower for thermally denuded particles relative to coated or uncoated particles, particularly at low and intermediate laser fluences.

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53 p.

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  • Report No.: SAND2013-7660
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 1096459
  • Archival Resource Key: ark:/67531/metadc845883

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  • September 1, 2013

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

Description Last Updated

  • Feb. 17, 2017, 4:20 p.m.

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Bambha, Ray P.; Dansson, Mark Alex; Schrader, Paul E. & Michelsen, Hope A. Effects of volatile coatings on the morphology and optical detection of combustion-generated black carbon particles., report, September 1, 2013; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc845883/: accessed May 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.