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Liquid-liquid phase separation and evaporation of a laser-trapped organic-organic airborne droplet using temporal spatial-resolved Raman spectroscopy

Abstract

Aerosol particles reaction could happen between different components within a particle or between a particle and its environment. The fate of atmospheric aerosols depends on the environment, the composition and the distribution of the components within a particle. It could be very interesting to see how a liquid aerosol particle behaves in ambinet air if the particle is composed of mixed chemicals. Does it remain in a mixed phase or separate as the liquid is aerosolized? How do the chemicals within the droplet separate and interact with the air? In this paper, individual single microdroplet, formed from organic-organic mixture of diethyl phthalate (DEPh) and glycerol, was investigated using laser-trapped position-resolved temporal Raman spectroscopic technology. For the first time, we were able to directly observe different gradient distributions of the two chemicals at different positions within such an airborne droplet, their time-resolved processes of liquid-liquid phase-separation, and changes in the physical microstructure and chemical micro-composition of the microdroplets in ambient air. Results revealed that the DEPh migrated to the surface and formed the outer layer and the glycerol was more concentrated toward the interior of the droplet , that and the DEPh evaporated rapidly than the more slowly evaporating glycerol, and that both organic chemicals within the mixed droplet evaporated much faster than either of them within their pure droplets. This technique also supplies a new method in studying the fine structure and chemical reactions of different molecules taking place inside a particle and at the interface of a particle with the surrounding microenvironment.

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Publication details

The article was received on 13 Apr 2018, accepted on 14 Jun 2018 and first published on 14 Jun 2018


Article type: Paper
DOI: 10.1039/C8CP02372G
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Liquid-liquid phase separation and evaporation of a laser-trapped organic-organic airborne droplet using temporal spatial-resolved Raman spectroscopy

    A. Kalume, C. Wang, J. Santarpia and Y. Pan, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP02372G

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