Heterogeneous Nucleation Experiments Bridging the Scale from Molecular Ion Clusters to Nanoparticles
- 7 March 2008
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 319 (5868), 1374-1377
- https://doi.org/10.1126/science.1149034
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.This publication has 22 references indexed in Scilit:
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