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Surface Potential of DPPC Monolayers on Concentrated Aqueous Salt Solutions
Clayton B Casper1, Dominique Verreault1, Ellen M Adams1
1Department of Chemistry and Biochemistry, The Ohio State University , 100 West 18th Avenue, Columbus, Ohio 43210, United States.
The Journal of Physical Chemistry. B
|January 14, 2016
Summary
Marine aerosol surface charge is key for cloud formation. Divalent cations like magnesium and calcium significantly alter the surface potential of organic monolayers more than monovalent cations.
Area of Science:
- Atmospheric Chemistry
- Surface Science
- Marine Aerosol Research
Background:
- Electrical charges on marine aerosols influence cloud condensation and thundercloud electrification.
- The role of organic compounds and inorganic ions in marine aerosol surface charging is not fully understood.
Purpose of the Study:
- To model and understand the electrical properties of organic-covered marine aerosols.
- To investigate the effect of marine-relevant cations on the surface potential of dipalmitoylphosphatidylcholine (DPPC) monolayers.
Main Methods:
- Measurement of surface potential of DPPC monolayers.
- Experiments conducted on concentrated chloride salt solutions (0.3-2.0 M) with Na+, K+, Mg(2+), and Ca(2+).
Main Results:
- Monovalent cations (Na+, K+) showed a weak effect on DPPC monolayer surface potential.
- Divalent cations (Mg(2+), Ca(2+)) significantly increased the surface potential, indicating different binding affinities.
- Divalent cations induced greater changes in PC headgroup orientation and interfacial water ordering compared to monovalent cations.
Conclusions:
- Divalent cations impact marine aerosol surface potential more strongly than monovalent cations.
- Complexation of divalent cations and screening of phosphate groups influence interfacial water and headgroup orientation, affecting surface potential.
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