| AVS 61st International Symposium & Exhibition | |
| Helium Ion Microscopy Focus Topic | Thursday Sessions |
| Session HI-ThP |
| Session: | Aspects of Helium Ion Microscopy Poster Session |
| Presenter: | Armin Gölzhäuser, University of Bielefeld, Germany |
| Authors: | M. Schenk, University of Bielefeld, Germany S. Lieb, University of Southern California H. Vieker, University of Bielefeld, Germany A. Beyer, University of Bielefeld, Germany A. Gölzhäuser, University of Bielefeld, Germany H. Wang, University of Southern California K. Kohse-Höinghaus, University of Bielefeld, Germany |
| Correspondent: | Click to Email |
Because of its importance for climate, environment and health, detailed information on soot emission is needed. It is particularly important to understand how characteristic parameters, such as size, morphology, and chemical reactivity of soot particles depend upon the formation process. Small soot particles can be particularly dangerous since they can penetrate deeply into the respiratory tract and they may also be more reactive than more mature, larger particles [1]. Investigating the nature of <10 nm soot particles is thus of particular interest. We have studied the morphology of nascent soot probed from previously well-characterized burner-stabilized ethylene flames [2] with Helium-Ion Microscopy (HIM) . HIM allows unambiguous recognition of smaller nascent soot particles than those observed in previous transmission electron microscopy studies. With this technique, surface details are visible down to approximately 5 nm, and particles as small as 2 nm are detectable. The results demonstrate that nascent soot is structurally and chemically inhomogeneous, and even the smallest particles can have shapes that deviate from a sphere [3]. Structural details will be discussed.
[1] B. Frank, R. Schlögl, D.S. Su, Environ. Sci. Technol. 47, 3026-3027, 2013.
[2] A.D. Abid, N. Heinz, E.D. Tolmachoff, D.J. Phares, C.S. Campbell, H. Wang, Combust. Flame 154, 775-788, 2008.
[3] M. Schenk, S. Lieb, H .Vieker, A. Beyer, A. Gölzhäuser, H. Wang, K. Kohse-Höinghaus, ChemPhysChem 14(14), 3248–3254, 2013.