Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 100: Nanostructures at surfaces: Dots, particles, clusters II
O 100.7: Vortrag
Donnerstag, 15. März 2018, 16:45–17:00, MA 141
Characterization of Soot Particles by Helium Ion Microscopy — •André Beyer1, Daniel Emmrich1, Maurin Salamanca2, Lena Ruwe2, Henning Vieker1, Katharina Kohse-Höinghaus2, and Armin Gölzhäuser1 — 1Physics of Supramolecular Systems and Surfaces, Bielefeld University, 33615 Bielefeld, Germany — 2Department of Chemistry, Bielefeld University, 33615 Bielefeld, Germany
Complementary techniques for the characterization of soot particles are needed to gain insight into their formation processes. In this contribution, we focus on Helium Ion Microscopy (HIM) which allows high contrast imaging of soot particles with sizes down to 2 nm. Soot formation was realized with well-defined model flames from different fuel compositions. The particles were sampled on silicon substrates at different positons within the flame which allows choosing the particles degree of maturity. Large numbers of particles were recorded with a single HIM image in a relatively short time. A number of such images were combined to obtain meaningful particle size distributions. In addition, the following geometric properties of soot particles were evaluated: sphericity, circularity, and fractal dimension. Comparison with other experimental techniques as well as theoretical model calculations demonstrate the strength of HIM as a soot characterization method [1-3].
[1] M. Schenk et al., ChemPhysChem 14 (2013) 3248.
[2] M. Schenk et al., Proc Combust Inst 35 (2015) 1879.
[3] C. Betrancourt et al., Aerosol Sci. Technol. 51 (2017) 916.