Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 113: Thin Films, Nanostructures and Nanoparticles II

O 113.9: Vortrag

Freitag, 24. März 2017, 12:30–12:45, ZEU 114

Metrology on Nascent Soot Particles from Flames by Helium Ion Microscopy — •Daniel Emmrich¹, Maurin Salamanca², Lena Ruwe², Henning Vieker¹, André Beyer¹, Katharina Kohse-Höinghaus², and Armin Gölzhäuser¹ — ¹Physics of Supramolecular Systems, Bielefeld University, 33615 Bielefeld, Germany — ²Department of Chemistry, Bielefeld University, 33615 Bielefeld, Germany

Soot emissions from combustion processes are a problem for environment and health. A detailed understanding on the formation process of soot is a prerequisite for the development of strategies to reduce the emission of soot. While mature soot particles are spherical aggregates with dimensions of 20-50 nm, nascent soot particles are smaller and structurally inhomogeneous. Thus, especially the latter poses challenges in their characterization. In this study, we extracted soot particles from flames of different fuels and use helium ion microscopy (HIM) to determine size and shape of the particle down to a size of 2 nm. HIM is a scanning technique similar to scanning electron microscopy (SEM) but taking advantage from the higher mass of the helium ions. The use of helium ions in comparison to electrons in SEM enables higher contrast accompanied with high resolution, high surface sensitivity and low beam currents resulting in low sample damage. This microscope enables high throughput and high resolution to follow the growth of nascent soot particles taken at different distances from the burner surface [1, 2]. [1] M. Schenk et al., ChemPhysChem, 14, 3248 (2013) [2] M. Schenk et al., Proc Combust Inst, 35, 1879 (2015)