Heterogeneous nucleation experiments bridging the scale from molecular ion clusters to nanoparticles |
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Authors: | Winkler Paul M Steiner Gerhard Vrtala Aron Vehkamäki Hanna Noppel Madis Lehtinen Kari E J Reischl Georg P Wagner Paul E Kulmala Markku |
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Affiliation: | Fakult?t für Physik, Universit?t Wien, Boltzmanngasse 5, A-1090 Wien, Austria. |
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Abstract: | Generation, investigation, and manipulation of nanostructured materials are of fundamental and practical importance for several disciplines, including materials science and medicine. Recently, atmospheric new particle formation in the nanometer-size range has been found to be a global phenomenon. Still, its detailed mechanisms are mostly unknown, largely depending on the incapability to generate and measure nanoparticles in a controlled way. In our experiments, an organic vapor (n-propanol) condenses on molecular ions, as well as on charged and uncharged inorganic nanoparticles, via initial activation by heterogeneous nucleation. We found a smooth transition in activation behavior as a function of size and activation to occur well before the onset of homogeneous nucleation. Furthermore, nucleation enhancement for charged particles and a substantial negative sign preference were quantitatively detected. |
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