Secondary organic aerosols (SOA) are formed in the atmosphere and are a mixture of organic and inorganic compounds. SOAs undergo liquid-liquid phase separation (LLPS) as relative humidity decreases, separating into a core and shell. This happens because of the salting-out effects of electrolytes. Current literature shows that LLPS occurs only if the ratio of oxygens to carbons (O:C) of the organics is between ~0.56 and ~0.71. The majority of studies look at systems of one organic and inorganic component, and those which study multiple organic components focus on the average O:C ratio of the system to determine if LLPS occurs. Using optical and Raman microscopy, we studied how phase separation changes by varying the ratio of organics to fluctuate the average O:C ratio. We will present results showing that average O:C ratio determines if LLPS will occur, but individual O:C ratios determine where the compound is located

Liquid-liquid phase separation of atmospheric aerosols and the effects of oxygen to carbon ratios

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.