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R Soc Open Sci

Title:		Repartitioning of glycerol between levitated and surrounding deposited glycerol/NaNO(3)/H(2)O droplets
Author(s):		Gao X; Cai C; Ma J; Zhang Y;
Address:		"The Institute of Chemical Physics, Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, People's Republic of China"
Journal Title:		R Soc Open Sci
Year:		2018
Volume:		20180103
Issue:		1
Page Number:		170819 -
DOI:		10.1098/rsos.170819
ISSN/ISBN:		2054-5703 (Print) 2054-5703 (Electronic) 2054-5703 (Linking)
Abstract:		"Repartitioning of semi-volatile organic compounds (SVOCs) between particles is an important process to understand the particle growth and shrinkage in the atmosphere environment. Here, by using optical tweezers coupled with cavity-enhanced Raman spectroscopy, we report the repartitioning of glycerol between a levitated glycerol/NaNO(3)/H(2)O droplet and surrounding glycerol/NaNO(3)/H(2)O droplets deposited on the inner wall of a chamber with different organic to inorganic molar ratios (OIRs). For the high OIR with 3 : 1, no NaNO(3) crystallization occurs both for levitated and deposited droplets in the whole relative humidity (RH) range, the radius of the levitated droplet decreases slowly due to the evaporation of glycerol from the levitated droplet at constant RHs. The levitated droplets radii with OIR of 1 : 1 and 1 : 3 increase with constant RHs that are lower than 45.3% and 55.7%, respectively, indicating that the repartitioning of glycerol occurs. The reason is that NaNO(3) in the deposited droplets is crystallized when RH is lower than 45.3% for 1 : 1 or 55.7% for 1 : 3. So the vapour pressure of glycerol at the surface of deposited droplets is higher than that of the levitated droplet which always remains as liquid droplet without NaNO(3) crystallization, resulting in the transfer of glycerol from the deposited ones to the levitated one. The process of the glycerol repartitioning we discussed herein is a useful model to interpret the repartitioning of SVOCs between the externally mixed particles with different phase states"
Keywords:		SVOCs aerosol glycerol/NaNO3/H2O optical tweezers repartitioning;
Notes:		"PubMed-not-MEDLINEGao, Xiaoyan Cai, Chen Ma, Jiabi Zhang, Yunhong eng England 2018/02/08 R Soc Open Sci. 2018 Jan 3; 5(1):170819. doi: 10.1098/rsos.170819. eCollection 2018 Jan"