Coating of soot and (NH4)2SO4 particles by ozonolysis products of α-pinene
No Thumbnail Available
Authors
Saathoff, Harald
Naumann, Karl-Heinz
Schnaiter, Martin
Schöck, Werner
Möhler, Ottmar
Schurath, Ulrich
Gysel, Martin
Baltensperger, Urs
Author (Corporation)
Publication date
10/2003
Typ of student thesis
Course of study
Collections
Type
01A - Journal article
Editors
Editor (Corporation)
Supervisor
Parent work
Journal of Aerosol Science
Special issue
DOI of the original publication
Link
Series
Series number
Volume
34
Issue / Number
10
Pages / Duration
1297-1321
Patent number
Publisher / Publishing institution
Elsevier
Place of publication / Event location
Amsterdam
Edition
Version
Programming language
Assignee
Practice partner / Client
Abstract
The ozonolysis of α-pinene in a large aerosol chamber was used to generate secondary organic aerosol (SOA) mass by homogeneous nucleation, or by heterogeneous nucleation, either on soot, or on (NH4)2SO4 seed aerosols. The rate of the α-pinene + ozone reaction and the aerosol yield of ∼19% are in good agreement with literature data. The organic coating of soot particles leads to a compaction of the fractal agglomerates expressed by an increase in fractal dimension from 1.9 to 2.1 for Diesel soot, and from 2.0 to 2.3 for spark generated “Palas” soot. The dielectric coating of the soot particles with SOA layers between 2 to 11 nm gives rise to a substantial enhancement of their single scattering albedo, from about 0.2 to 0.5, and increases the effective absorption coefficients of both soot types by ca. 30%. The coating of both soot types increases the hygroscopic growth factors (HGF) to values close below the HGF measured for pure SOA material d/d0∼1:12 at 90% RH.
Keywords
Subject (DDC)
550 - Geowissenschaften
Event
Exhibition start date
Exhibition end date
Conference start date
Conference end date
Date of the last check
ISBN
ISSN
0021-8502
Language
English
Created during FHNW affiliation
No
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
Closed
License
Citation
SAATHOFF, Harald, Karl-Heinz NAUMANN, Martin SCHNAITER, Werner SCHÖCK, Ottmar MÖHLER, Ulrich SCHURATH, Ernest WEINGARTNER, Martin GYSEL und Urs BALTENSPERGER, 2003. Coating of soot and (NH4)2SO4 particles by ozonolysis products of α-pinene. Journal of Aerosol Science. Oktober 2003. Bd. 34, Nr. 10, S. 1297–1321. DOI 10.1016/s0021-8502(03)00364-1. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46807