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The Effect of Low Solublility Organic Acids on the Hygroscopicity of Sodium Halide Aerosols : Volume 14, Issue 4 (18/02/2014)

By Miñambres, L.

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Book Id: WPLBN0003976369
Format Type: PDF Article :
File Size: Pages 37
Reproduction Date: 2015

Title: The Effect of Low Solublility Organic Acids on the Hygroscopicity of Sodium Halide Aerosols : Volume 14, Issue 4 (18/02/2014)  
Author: Miñambres, L.
Volume: Vol. 14, Issue 4
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Castaño, F., Sánchez, M. N., Méndez, E., Miñambres, L., & Basterretxea, F. J. (2014). The Effect of Low Solublility Organic Acids on the Hygroscopicity of Sodium Halide Aerosols : Volume 14, Issue 4 (18/02/2014). Retrieved from

Description: Departamento de Química Física, Facultad de Ciencia y Tecnología, University of the Basque Country, UPV/EHU, Campus de Leioa, B. Sarriena, s/n, Leioa 48940, Spain. In order to accurately assess the influence of fatty acids on the hygroscopic and other physicochemical properties of sea salt aerosols, hexanoic, octanoic or lauric acid together with sodium halide salts (NaCl, NaBr and NaI) have been chosen to be performed in this study. The hygroscopic properties of sodium halide submicrometer particles covered with organic acids have been examined by Fourier-transform infrared spectroscopy in an aerosol flow cell. Covered particles were generated by flowing atomized sodium halide particles (either dry or aqueous) through a heated oven containing the gaseous acid. The obtained results indicate that gaseous organic acids easily nucleate onto dry and aqueous sodium halide particles. On the other hand, Scanning Electron Microscopy (SEM) images indicate that lauric acid coating on NaCl particles makes them to aggregate in small clusters. The hygroscopic behaviour of covered sodium halide particles in deliquescence mode shows different features with the exchange of the halide ion: whereas the organic covering has little effect in NaBr particles, NaCl and NaI covered particles change their deliquescence relative humidities, with different trends observed for each of the acids studied. In efflorescence mode, the overall effect of the organic covering is to retard the loss of water in the particles. It has been observed that the presence of gaseous water in heterogeneously nucleated particles tends to displace the cover of hexanoic acid to energetically stabilize the system.

The effect of low solublility organic acids on the hygroscopicity of sodium halide aerosols

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