Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 16, Issue 21, Pages 9819-9830Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp54233e
Keywords
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Funding
- ETH Zurich
- Swiss National Science Foundation
- Canada Foundation for Innovation
- EPSRC
- NERC through ACID-PRUF programme
- European Union
- Killam Postdoctoral Fellowship
- Engineering and Physical Sciences Research Council [EP/K503484/1, 1632983, EP/G007713/1] Funding Source: researchfish
- EPSRC [EP/G007713/1] Funding Source: UKRI
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Evaporation studies of single aqueous sucrose aerosol particles as a function of relative humidity (RH) are presented for coarse and fine mode particles down into the submicron size range (600 nm < r < 3.0 mu m). These sucrose particles serve as a proxy for biogenic secondary organic aerosols that have been shown to exist, under ambient conditions, in an ultraviscous glassy state, which can affect the kinetics of water mass transport within the bulk phase and hinder particle response to changes in the gas phase water content. A counter-propagating Bessel beams (CPBBs) optical trapping setup is employed to monitor the realtime change in the particle radius with RH decreasing from 75% to 5%. The slow-down of the size change upon each RH step and the deviation from the theoretical equilibrium hygroscopic growth curve indicate the onset of glassy behavior in the RH range of 10-40%. Size-dependent effects were not observed within the uncertainty of the measurements. The influence of the drying time below the glass transition RH on the timescale of subsequent water condensation and re-equilibration for sucrose particles is explored by optical tweezers measurements of micron-sized particles (3 mu m < r < 6 mu m). The timescale for water condensation and re-equilibration is shown to increase with increasing drying time, i.e. the time over which a viscous particle is dried below 5% RH. These studies demonstrate the importance of the history of the particle conditioning on subsequent water condensation and re-equilibration dynamics of ultraviscous and glassy aerosol particles.
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