%0 Journal Article %1 Najera:2009p1824 %A Najera, Juan J %A Horn, Andrew B %D 2009 %J Physical Chemistry Chemical Physics %K Acid, Aerosols, Aqueous-Solutions, Atmospheric Cloud Droplets, Films, Glutaric Growth, Hygroscopic Oleate, Organic Particles, Phase-Changes Relative-Humidity, Sodium Tropospheric %N 3 %P 483--494 %R 10.1039/b812182f %T Infrared spectroscopic study of the effect of oleic acid on the deliquescence behaviour of ammonium sulfate aerosol particles %U http://www.rsc.org/publishing/journals/CP/article.asp?doi=b812182f %V 11 %X In order to accurately assess the impact of fatty acids on the hygroscopic properties of atmospheric aerosol particles, (NH4)(2)SO4 ( 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)(2)SO4 and oleic acid were generated by nebulising aqueous solutions of (NH4)(2)SO4 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)(2)SO4 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.

@article{Najera:2009p1824, abstract = {In order to accurately assess the impact of fatty acids on the hygroscopic properties of atmospheric aerosol particles, (NH4)(2)SO4 ( 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)(2)SO4 and oleic acid were generated by nebulising aqueous solutions of (NH4)(2)SO4 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)(2)SO4 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.}, added-at = {2010-06-22T19:38:37.000+0200}, affiliation = {Univ Manchester, Sch Earth Atmospher {\&} Environm Sci, Manchester M13 9PL, Lancs, England}, author = {Najera, Juan J and Horn, Andrew B}, biburl = {https://www.bibsonomy.org/bibtex/2d80ca6089ef025398c8930eabc43d10d/gsmith}, date-added = {2010-03-11 11:08:57 -0500}, date-modified = {2010-03-11 11:08:58 -0500}, doi = {10.1039/b812182f}, interhash = {23d3c8207b6a8b697e022fe11cf81ff8}, intrahash = {d80ca6089ef025398c8930eabc43d10d}, journal = {Physical Chemistry Chemical Physics}, keywords = {Acid, Aerosols, Aqueous-Solutions, Atmospheric Cloud Droplets, Films, Glutaric Growth, Hygroscopic Oleate, Organic Particles, Phase-Changes Relative-Humidity, Sodium Tropospheric}, language = {English}, local-url = {file://localhost/Users/geoffreysmith/Documents/Papers/Physical%20Chemistry%20Chemical%20Physics/2009/Physical%20Chemistry%20Chemical%20Physics,%2011,%20483-494%202009.pdf}, month = Jan, number = 3, pages = {483--494}, pmid = {000262007000005}, rating = {0}, timestamp = {2010-06-22T19:39:05.000+0200}, title = {Infrared spectroscopic study of the effect of oleic acid on the deliquescence behaviour of ammonium sulfate aerosol particles}, uri = {papers://E88B624E-D406-46FF-9D95-BB9C1AAE3FDC/Paper/p1824}, url = {http://www.rsc.org/publishing/journals/CP/article.asp?doi=b812182f}, volume = 11, year = 2009 }