Heterogeneous Nucleation Experiments Bridging the Scale from Molecular Ion Clusters to Nanoparticles

Autor(en)

Paul Winkler, Gerhard Steiner, Aron Vrtala, H Vehkamäki, M. Noppel, Kari E. J. Lehtinen, Georg Reischl, Paul Wagner, Markku Kulmala

Abstrakt

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.

Organisation(en)

Aerosolphysik und Umweltphysik

Externe Organisation(en)

University of Helsinki

Journal

Science

Band

319

Seiten

1374-1377

Anzahl der Seiten

4

ISSN

0036-8075

DOI

https://doi.org/10.1126/science.1149034

Publikationsdatum

2008

Peer-reviewed

Ja

ÖFOS 2012

103020 Oberflächenphysik, 210006 Nanotechnologie, 105904 Umweltforschung

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/37f3d2b6-8299-4167-8068-1566f2ee254d