@article {33047,
	title = {Liquid-liquid phase separation in organic particles consisting of α-pinene and β-caryophyllene ozonolysis products and mixtures with commercially-available organic compounds},
	journal = {ATMOSPHERIC CHEMISTRY AND PHYSICS},
	volume = {20},
	year = {2020},
	month = {OCT 2020},
	pages = {11263-11273},
	abstract = {<p>Liquid\&ndash;liquid phase separation (LLPS) in organic aerosol particles can impact several properties of atmospheric particulate matter, such as cloud condensation nuclei (CCN) properties, optical properties, and gas-to-particle partitioning. Yet, our understanding of LLPS in organic aerosols is far from complete. Here, we report on LLPS of one-component and two-component organic particles consisting of α-pinene- and β-caryophyllene-derived ozonolysis products and commercially-available organic compounds of relevance to atmospheric organic particles. In the experiments involving single-component organic particles, LLPS was observed in 8 out of 11 particle types studied. LLPS almost always occurred when the oxygen-to-carbon elemental ratio (O : C) was \&le; 0.44, but did not occur when O : C was \&gt; 0.44. The phase separation occurred by spinodal decomposition, and when LLPS occurred, two liquid phases co-existed up to ~ 100 \% relative humidity (RH). In the experiments involving two-component organic particles, LLPS was observed in 23 out of 25 particles types studied. LLPS almost always occurred when the average was O : C \&le; 0.67, but never occurred when the average O : C was \&gt; 0.67. The phase separation occurred by spinodal decomposition or growth of a second phase at the surface of the particles. When LLPS occurred, two liquid phases co-existed up to ~ 100 \%. These results provide further evidence that LLPS is likely a frequent occurrence in organic aerosol particles in the troposphere, even in the absence of inorganic salts.</p>},
	doi = {10.5194/acp-2020-318},
	url = {https://acp.copernicus.org/preprints/acp-2020-318/},
	author = {Song, Y.-C. and B{\'e}, G. and Martin, S. T. and Geiger, F. M. and Bertram, A. K. and Thomson, R. J. and Song, M.}
}
