Unary and Binary Heterogeneous Nucleation of Organic Vapors on Monodisperse WOx Seed Particles with Diameters Down to 1.4 nm

Autor(en)

Paul Winkler, Gerhard Steiner, Aron Vrtala, Georg Reischl, Markku Kulmala, Paul Wagner

Abstrakt

Unary and binary heterogeneous nucleation has been studied experimentally using monodisperse tungsten oxide (WOx) particles in the size range from 1.4 nm up to 7 nm. WOx particles were generated using a commercially available WOx generator in combination with a nanoDMA for size selection. n-Propanol and n-nonane as well as mixtures thereof were used as the nucleating substances. The experiments were performed with an expansion-type condensation particle counter in combination with a constant-angle Mie scattering detector providing counting efficiency of 100% down to at least 3 nm particle diameter. The binary n-propanol-n-nonane system was found to co-nucleate only reluctantly which is in agreement with homogeneous nucleation experiments as well as composition of critical clusters as determined by the heterogeneous nucleation theorem. The size dependent measurements for the pure systems revealed that n-nonane leads to contamination of the chamber at particle sizes below 4 nm. In contrast, n-propanol is suitable to detect particles as small as 1.4 nm.

Organisation(en)

Aerosolphysik und Umweltphysik

Externe Organisation(en)

University of Helsinki

Journal

Aerosol Science and Technology

Band

45

Seiten

493-498

Anzahl der Seiten

6

ISSN

0278-6826

DOI

https://doi.org/10.1080/02786826.2010.547536

Publikationsdatum

2011

Peer-reviewed

Ja

ÖFOS 2012

1030 Physik, Astronomie, 103008 Experimentalphysik, 105904 Umweltforschung

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/f2103ceb-30e9-455f-9839-6f6b8624fdf5