Condensation Kinetics of Water on Amorphous Aerosol Particles

Responding to changes in the surrounding environment, aerosol particles can grow by water condensation changing rapidly in composition and changing dramatically in viscosity. The timescale for growth is important to establish for particles undergoing hydration processes in the atmosphere or during i...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2018-07, Vol.9 (13), p.3708-3713
Main Authors: Rothfuss, Nicholas E, Marsh, Aleksandra, Rovelli, Grazia, Petters, Markus D, Reid, Jonathan P
Format: Article
Language:English
Subjects:
Chemistry
Materials Science
Physics
Science & Technology - Other Topics
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Summary:Responding to changes in the surrounding environment, aerosol particles can grow by water condensation changing rapidly in composition and changing dramatically in viscosity. The timescale for growth is important to establish for particles undergoing hydration processes in the atmosphere or during inhalation. Using an electrodynamic balance, we report direct measurements at −7.5, 0, and 20 °C of timescales for hygroscopic condensational growth on a range of model hygroscopic aerosol systems. These extend from viscous aerosol particles containing a single saccharide solute (sucrose, glucose, raffinose, or trehalose) and a starting viscosity equivalent to a glass of ∼1012 Pa·s, to nonviscous (∼10–2 Pa·s) tetraethylene glycol particles. The condensation timescales observed in this work indicate that water condensation occurs rapidly at all temperatures examined (
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.8b01365