Atmospheric Surfactants and Humic-like Substances

A special issue of Atmosphere (ISSN 2073-4433). This special issue belongs to the section "Aerosols".

Deadline for manuscript submissions: closed (31 May 2013) | Viewed by 10496

Special Issue Editors

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Guest Editor
1. Department of Marine Environment and Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
2. School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK
Interests: air pollution exposure; air pollution in China; fireworks pollution; heritage climatology
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Guest Editor
Department of Earth Science and Environment, Universiti Kebangsaan Malaysia, Malaysia
Interests: composition of atmospheric aerosols; atmospheric surfactants; source apportionment of atmospheric pollutants; surface ozone and volatile organic carbon; volatile organic carbons from sea-surface microlayer
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Over the last two decades awareness has grown of potential roles for surfactants, long chain carboxylic acids and humic-like substances in the atmospheric aerosol. Surfactants in the atmosphere can arise from the sea-surface microlayer, be associated with biomass burning or other combustion processes, which can produce humic-like substances (HULIS). Large humic-like substance molecules can act as surface active components, alter surface tension, increase the solubility of organic substances, slow the evaporation of water from aerosols, and have the potential to alter droplet size. They could affect climate by producing more cloud droplets and therefore a higher albedo. Humic-like substances and surfactants in the atmosphere are relevant to global and regional atmospheric chemistry and have implication for developing environmental policies.

We are planning a special issue devoted to papers, which will provide in-depth reviews of physical and chemical characteristics and formation of atmospheric surfactants and humic-like. We would be interested in critical reviews of their possible anthropogenic and natural sources, characteristics and contribution to cloud formation and solubility as well as the impact of surfactants on the climate change and human health as part of this special issue. We hope that this issue in Atmosphere will serve as the compendium of the current state of understanding and
be of value to specialist workshops on this topic.

Prof. Dr. Peter Brimblecombe
Dr. Mohd Talib Abd Latif
Guest Editors

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  • surfactants
  • humic like substances
  • atmospheric aerosol
  • water soluble organic matter

Published Papers (1 paper)

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Palmitic Acid on Salt Subphases and in Mixed Monolayers of Cerebrosides: Application to Atmospheric Aerosol Chemistry
by Ellen M. Adams and Heather C. Allen
Atmosphere 2013, 4(4), 315-336; - 10 Oct 2013
Cited by 56 | Viewed by 9783
Palmitic acid (PA) has been found to be a major constituent in marine aerosols, and is commonly used to investigate organic containing atmospheric aerosols, and is therefore used here as a proxy system. Surface pressure-area isotherms (π-A), Brewster angle microscopy (BAM), and vibrational [...] Read more.
Palmitic acid (PA) has been found to be a major constituent in marine aerosols, and is commonly used to investigate organic containing atmospheric aerosols, and is therefore used here as a proxy system. Surface pressure-area isotherms (π-A), Brewster angle microscopy (BAM), and vibrational sum frequency generation (VSFG) were used to observe a PA monolayer during film compression on subphases of ultrapure water, CaCl2 and MgCl2 aqueous solutions, and artificial seawater (ASW). π-A isotherms indicate that salt subphases alter the phase behavior of PA, and BAM further reveals that a condensation of the monolayer occurs when compared to pure water. VSFG spectra and BAM images show that Mg2+ and Ca2+ induce ordering of the PA acyl chains, and it was determined that the interaction of Mg2+ with the monolayer is weaker than Ca2+. π-A isotherms and BAM were also used to monitor mixed monolayers of PA and cerebroside, a simple glycolipid. Results reveal that PA also has a condensing effect on the cerebroside monolayer. Thermodynamic analysis indicates that attractive interactions between the two components exist; this may be due to hydrogen bonding of the galactose and carbonyl headgroups. BAM images of the collapse structures show that mixed monolayers of PA and cerebroside are miscible at all surface pressures. These results suggest that the surface morphology of organic-coated aerosols is influenced by the chemical composition of the aqueous core and the organic film itself. Full article
(This article belongs to the Special Issue Atmospheric Surfactants and Humic-like Substances)
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