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Studies of Competing Evaporation Rates of Multiple Volatile Components from a Single Binary-Component Aerosol Droplet

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)9709-9719
Number of pages11
JournalPhysical Chemistry Chemical Physics
Volume21
Early online date23 Apr 2019
DOIs
DateAccepted/In press - 20 Apr 2019
DateE-pub ahead of print - 23 Apr 2019
DatePublished (current) - 21 May 2019

Abstract

The simultaneous evaporation and condensation of multiple volatile components from multicomponent aerosol droplets leads to changes in droplet size, composition and temperature. Measurements and models that capture and predict these dynamic aerosol processes are key to understanding aerosol microphysics in a broad range of contexts. We report measurements of the evaporation kinetics of droplets (initially ∼25 μm radius) formed from mixtures of ethanol and water levitated within a electrodynamic balance over timescales spanning 500 ms to 6 s. Measurements of evaporation into a gas phase of varied relative humidity and temperature are shown to compare well with predictions from a numerical model. We show that water condensation from the gas phase can occur concurrently with ethanol evaporation from aqueous–ethanol droplets. Indeed, water can condense so rapidly during the evaporation of a pure ethanol droplet in a humid environment, driven by the evaporative cooling the droplet experiences, that the droplet becomes pure water within 0.4 s.

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Royal Society of Chemistry at https://pubs.rsc.org/en/content/articlelanding/2019/cp/c9cp01158g#!divAbstract. Please refer to any applicable terms of use of the publisher.

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    Embargo ends: 23/04/20

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