In stark contrast, recent measurements of organic particle properties often imply the existence of highly viscous semi-solid and even amorphous solid particles 4, 5, 6. Until recently, researchers assumed that atmospheric organic particles are liquid in phase and, hence, have low viscosity. The composition of SOA is especially uncertain, with only approximately 10% of the mass of secondary OA identified at the molecular level 2. Ambient organic aerosols (OA) can be emitted directly (referred to as primary OA) or can be formed by a complex series of reactions (referred to as secondary OA, SOA) 3. The organic component can represent 50% or more of the mass of the fine aerosol particle fraction (particles smaller than 1 μm in diameter) in the atmosphere 2. Atmospheric particles, which range in size from <10 nm to ∼10 μm, consist of both inorganic and organic material 1, 2.
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