Low Fractal Dimension Cluster-Dilute Soot Aggregates from a Premixed Flame

被引：53

作者：

Chakrabarty, Rajan K. ^{[1
,2
]}

Moosmueller, Hans ^{[1
]}

Arnott, W. Patrick ^{[1
,3
]}

Garro, Mark A. ^{[1
,4
]}

Tian, Guoxun ^{[1
,3
]}

Slowik, Jay G. ^{[5
]}

Cross, Eben S. ^{[6
]}

Han, Jeong-Ho ^{[6
]}

Davidovits, Paul ^{[6
]}

Onasch, Timothy B. ^{[7
]}

Worsnop, Douglas R. ^{[7
]}

机构：

[1] Nevada Syst Higher Educ, Desert Res Inst, Reno, NV 89512 USA

[2] Univ Nevada, Chem Phys Program, Reno, NV 89557 USA

[3] Univ Nevada, Dept Phys, Reno, NV 89557 USA

[4] Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA

[5] Univ Toronto, Dept Chem, Toronto, ON M5S 3H6, Canada

[6] Boston Coll, Dept Chem, Chestnut Hill, MA 02467 USA

[7] Aerodyne Res Inc, Billerica, MA 01821 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 23期

基金：

美国国家科学基金会;

关键词：

LIGHT-SCATTERING; COAGULATION; MORPHOLOGY; AEROSOLS;

D O I：

10.1103/PhysRevLett.102.235504

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using a novel morphology segregation technique, we observed minority populations (approximate to 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 approximate to 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.

引用

页数：4

共 35 条

[1] Morphology based particle segregation by electrostatic charge [J].

Chakrabarty, Rajan K. ;

Moosmuller, Hans ;

Garro, Mark A. ;

Arnott, W. Patrick ;

Slowik, Jay G. ;

Cross, Eben S. ;

Han, Jeong-Ho ;

Davidovits, Paul ;

Onasch, Timothy B. ;

Worsnop, Douglas R. .

JOURNAL OF AEROSOL SCIENCE, 2008, 39 (09) :785-792

[2] Light scattering and absorption by fractal-like carbonaceous chain aggregates:: Comparison of theories and experiment [J].

Chakrabarty, Rajan K. ;

Moosm ller, Hans ;

Arnott, W. Patrick ;

Garro, Mark A. ;

Slowik, Jay G. ;

Cross, Eben S. ;

Han, Jeong-Ho ;

Davidovits, Paul ;

Onasch, Timothy B. ;

Worsnop, Douglas R. .

APPLIED OPTICS, 2007, 46 (28) :6990-7006

[3] Emissions from the laboratory combustion of wildland fuels:: Particle morphology and size [J].

Chakrabarty, RK ;

Moosmüller, H ;

Garro, MA ;

Arnott, WP ;

Walker, J ;

Susott, RA ;

Babbitt, RE ;

Wold, CE ;

Lincoln, EN ;

Hao, WM .

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2006, 111 (D7)

[4] Hybrid superaggregate morphology as a result of aggregation in a cluster-dense aerosol [J].

Dhaubhadel, R ;

Pierce, F ;

Chakrabarti, A ;

Sorensen, CM .

PHYSICAL REVIEW E, 2006, 73 (01)

[5]

Finlayson-Pitts BJ, 2000, Chemistry of the Upper and Lower Atmosphere: Theory, Experiments, and Applications

[6] LONG-RANGE CORRELATIONS IN SMOKE-PARTICLE AGGREGATES [J].

FORREST, SR ;

WITTEN, TA .

JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL, 1979, 12 (05) :L109-L117

[7]

Friedlander SheldonK., 1977, Smoke, Dust, and Haze Fundamentals of Aerosol Behavior

[8] Global sensitivity studies of the direct radiative forcing due to anthropogenic sulfate and black carbon aerosols [J].

Haywood, JM ;

Ramaswamy, V .

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 1998, 103 (D6) :6043-6058

[9] Flame synthesis of single-walled carbon nanotubes [J].

Height, MJ ;

Howard, JB ;

Tester, JW ;

Sande, JBV .

CARBON, 2004, 42 (11) :2295-2307

[10] AGGREGATION OF MAGNETIC MICROSPHERES - EXPERIMENTS AND SIMULATIONS [J].

HELGESEN, G ;

SKJELTORP, AT ;

MORS, PM ;

BOTET, R ;

JULLIEN, R .

PHYSICAL REVIEW LETTERS, 1988, 61 (15) :1736-1739

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