title: Low fractal dimension cluster-dilute soot aggregates from a premixed flame.
abstract: Using a novel morphology segregation technique, we observed minority populations ( approximately 3%) of submicron-sized, cluster-dilute fractal-like aggregates, formed in the soot-formation window (fuel-to-air equivalence ratio of 2.0-3.5) of a premixed flame, to have mass fractal dimensions between 1.2 and 1.51. Our observations disagree with previous observations of a universal mass fractal dimension of approximately 1.8 for fractal-like aerosol aggregates formed in the dilute-limit via three-dimensional diffusion-limited cluster aggregation processes. A hypothesis is presented to explain this observation. Subject to verification of this hypothesis, it may be possible to control the fractal dimension and associated properties of aggregates in the cluster-dilute limit through application of a static electric field during the aggregation process.
authors: Desert Research Institute, Nevada System of Higher Education, Reno, NV 89512, USA. Rajan.Chakrabarty@dri.edu
authors: Rajan K
authors: RK
authors: Chakrabarty
authors: Hans
authors: H
authors: Moosmüller
authors: W Patrick
authors: WP
authors: Arnott
authors: Mark A
authors: MA
authors: Garro
authors: Guoxun
authors: G
authors: Tian
authors: Jay G
authors: JG
authors: Slowik
authors: Eben S
authors: ES
authors: Cross
authors: Jeong-Ho
authors: JH
authors: Han
authors: Paul
authors: P
authors: Davidovits
authors: Timothy B
authors: TB
authors: Onasch
authors: Douglas R
authors: DR
authors: Worsnop