The Hydropathy Scale as a Gauge of Hygroscopicity in Sub-Micron Sodium Chloride-Amino Acid Aerosols

Joshua P. Darr, Salvatore Gottuso, Mohammed Alfarra, David Birge, Kimberly Ferris, Dillon Woods, Paul Morales, Megan Grove, William K. Mitts, Eduardo Mendoza-Lopez, Amissabah Johnson

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Sodium chloride, NaCl, is commonly used as a proxy for sea spray aerosols. However, field work has demonstrated that sea spray aerosols also often contain a significant organic component. In this work, we examine the effect of amino acids on the hygroscopic properties of NaCl aerosols using a Fourier transform infrared spectrometer coupled to a flow-cell apparatus. It is found that the effect can be drastically different depending on the nature of the amino acid. More hydrophilic amino acids such as glycine lead to continuous hygroscopic growth of internally mixed NaCl-amino acid aerosols generated from an equimolar precursor solution. However, more hydrophobic amino acids such as alanine do not significantly alter the hygroscopicity of NaCl aerosols. The hydropathy scale is found to be a good qualitative diagnostic for the effect that an amino acid will have on the hygroscopicity of NaCl.

Original languageEnglish (US)
Pages (from-to)8062-8070
Number of pages9
JournalJournal of Physical Chemistry A
Volume122
Issue number40
DOIs
StatePublished - Oct 11 2018

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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