TITLE

In situ measurement of the fractal dimensionality of ultrafine aerosol particles

AUTHOR(S)
Schmidt-Ott, A.
PUB. DATE
March 1988
SOURCE
Applied Physics Letters;3/21/1988, Vol. 52 Issue 12, p954
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The fractal dimension df of gas phase agglomerated particles is measured in situ for the first time. This is done by comparing aerodynamic radii R0 and Rc1 before and after tempering. By tempering, agglomerates are collapsed into close-packed clusters of df=3. It is shown that the equation M∼Rdf0 , where M is the agglomerate mass, holds almost down to R0=Rc1 =Rm (monomer radius), making df a very useful quantity for aerosol characterization. The measurement yields df[bar_over_tilde:_approx._equal_to]2.18 for Ag agglomerates with Rm[bar_over_tilde:_approx._equal_to]7.5 nm. df is predicted to be material dependent.
ACCESSION #
9826316

 

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