Issue 3, 2009
From the journal:

Physical Chemistry Chemical Physics

Infrared spectroscopic study of the effect of oleic acid on the deliquescence behaviour of ammonium sulfate aerosol particles

Juan J. Nájera*a  and  Andrew B. Hornb  

* Corresponding authors

a School of Earth, Atmospheric and Environmental Science, The University of Manchester, Oxford Road, Manchester, UK
E-mail: juan.najera@manchester.ac.uk
Fax: 44 (0) 161 2754598
Tel: 44 (0) 161 2754618

b School of Chemistry, The University of Manchester, Oxford Road, Manchester, UK
E-mail: Andrew.B.Horn@manchester.ac.uk
Fax: 44 (0) 161 2754598
Tel: 44 (0) 161 2754618

Abstract

In order to accurately assess the impact of fatty acids on the hygroscopic properties of atmospheric aerosol particles, (NH4)2SO4 (ammonium sulfate) and oleic acid (cis-9-octadecenoic acid) were chosen to perform this study as components of the particle phase. Micron-sized (700–900 nm) particles containing (NH4)2SO4 and oleic acid were generated by nebulising aqueous solutions of (NH4)2SO4 and sodium oleate. In this study, the effect of oleic acid on the deliquescence phase transition of particles was investigated in a room temperature aerosol flow tube (AFT) system using Fourier transform infrared (FTIR) spectroscopy. Particles morphologies and their chemical compositions were also analysed using a variety of techniques, including attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy and scanning electron microscopy/energy dispersive X-ray analysis (SEM/EDX). The deliquescence relative humidity (DRH) of the (NH4)2SO4 component, determined at 81 ± 2%, was slightly lowered or not affected by the presence of different thickness of oleic acid (21 nm, 44 nm and 109 nm) present in the particles. Analyses of the results presented here are consistent with earlier studies about the possible effects of water–insoluble fatty acids coatings on the phase transitions of atmospheric aerosol particles.

Graphical abstract: Infrared spectroscopic study of the effect of oleic acid on the deliquescence behaviour of ammonium sulfate aerosol particles

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Article information

DOI
https://doi.org/10.1039/B812182F
Article type
Paper
Submitted
23 Jul 2008
Accepted
22 Sep 2008
First published
06 Nov 2008

Phys. Chem. Chem. Phys., 2009,11, 483-494

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Infrared spectroscopic study of the effect of oleic acid on the deliquescence behaviour of ammonium sulfate aerosol particles

J. J. Nájera and A. B. Horn, Phys. Chem. Chem. Phys., 2009, 11, 483 DOI: 10.1039/B812182F

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