Fractal morphology, imaging and mass spectrometry of single aerosol particles in flight

L, N, Hampton, C, Martin, A and et al, 2012, 'Fractal morphology, imaging and mass spectrometry of single aerosol particles in flight', Nature, vol. 486, no. 7404, pp. 513-517.

Document type: Journal Article
Collection: Journal Articles

Title Fractal morphology, imaging and mass spectrometry of single aerosol particles in flight
Author(s) L, N
Hampton, C
Martin, A
et al,
Year 2012
Journal name Nature
Volume number 486
Issue number 7404
Start page 513
End page 517
Total pages 5
Publisher Nature Publishing Group
Abstract The morphology of micrometre-size particulate matter is of critical importance in fields ranging from toxicology to climate science, yet these properties are surprisingly difficult to measure in the particles native environment. Electron microscopy requires collection of particles on a substrate; visible light scattering provides insufficient resolution; and X-ray synchrotron studies have been limited to ensembles of particles. Here we demonstrate an in situ method for imaging individual sub-micrometre particles to nanometre resolution in their native environment, using intense, coherent X-ray pulses from the Linac Coherent Light Source free-electron laser. We introduced individual aerosol particles into the pulsed X-ray beam, which is sufficiently intense that diffraction from individual particles can be measured for morphological analysis. At the same time, ion fragments ejected from the beam were analysed using mass spectrometry, to determine the composition of single aerosol particles. Our results show the extent of internal dilation symmetry of individual soot particles subject to non-equilibrium aggregation, and the surprisingly large variability in their fractal dimensions. More broadly, our methods can be extended to resolve both static and dynamic morphology of general ensembles of disordered particles. Such general morphology has implications in topics such as solvent accessibilities in proteins, vibrational energy transfer by the hydrodynamic interaction of amino acids, and large-scale production of nanoscale structures by flame synthesis. © 2012 Macmillan Publishers Limited. All rights reserved.
Subject Condensed Matter Imaging
DOI - identifier 10.1038/nature11222
Copyright notice © 2012 Macmillan Publishers Limited. All rights reserved
ISSN 0028-0836
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