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Impacts of Salt and pH on the Phase Behavior of Sea Spray Aerosol Proxy Films

Carter, Kimberly Anne
http://orcid.org/0000-0003-0071-7127
http://rave.ohiolink.edu/etdc/view?acc_num=osu1534468159117872

Abstract Details

2018, Master of Science, Ohio State University, Chemistry.
Sea spray aerosol (SSA) constitutes one of the largest fractions of aerosol emissions on the planet, and it impacts Earth’s radiative budget by regulating cloud albedo, cloud formation, and ice nucleation in the troposphere. Organic matter from the ocean is enriched in SSA with surfactants comprising one of the most surface active classes of compounds. Saturated fatty acids are particularly abundant and readily form thin films at the air-water interface. In this study, a proxy SSA mixture was used to examine interfacial amphiphile organization and dynamics as a function of aqueous subphase composition. The goal was to understand how soluble fatty acids impact film phase behavior at various SSA-relevant pH values. To do this, surface pressure-area isotherms were conducted at nascent SSA and at acidified SSA conditions. Soluble surfactants contribute to SSA proxy phase behavior regardless of the pH, but their overall impact on surface organization increases with decreasing pH. Thus, as SSA acidifies in the marine boundary layer, the surface activity of soluble fatty acids dramatically increases. This work highlights the necessity of including parameters for soluble surfactants in global climate models.
Heather Allen (Advisor)
Sherwin Singer (Committee Member)
110 p.
Chemical Oceanography; Chemistry; Environmental Science; Physical Chemistry
Sea Spray Aerosol; Mixed Monolayers; Fatty Acids; Surface Pressure-Area Isotherms; Air-Water Interface

Recommended Citations

Citations

  • Carter, K. A. (2018). Impacts of Salt and pH on the Phase Behavior of Sea Spray Aerosol Proxy Films [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1534468159117872

    APA Style (7th edition)

  • Carter, Kimberly. Impacts of Salt and pH on the Phase Behavior of Sea Spray Aerosol Proxy Films. 2018. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1534468159117872.

    MLA Style (8th edition)

  • Carter, Kimberly. "Impacts of Salt and pH on the Phase Behavior of Sea Spray Aerosol Proxy Films." Master's thesis, Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1534468159117872

    Chicago Manual of Style (17th edition)

osu1534468159117872
100
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This open access ETD is published by The Ohio State University and OhioLINK.