Articles | Volume 14, issue 7
https://doi.org/10.5194/amt-14-5001-2021
https://doi.org/10.5194/amt-14-5001-2021
Research article
 | 
21 Jul 2021
Research article |  | 21 Jul 2021

A dual-droplet approach for measuring the hygroscopicity of aqueous aerosol

Jack M. Choczynski, Ravleen Kaur Kohli, Craig S. Sheldon, Chelsea L. Price, and James F. Davies

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Short summary
Relative humidity (RH) and hygroscopicity play an important role in regulating the physical, chemical, and optical properties of aerosol. In this work, we develop a new method to characterize hygroscopicity using particle levitation. We levitate two droplets with an electrodynamic balance and measure their size with light-scattering methods using one droplet as a probe of the RH. We demonstrate highly accurate and precise measurements of the RH and hygroscopic growth of a range of samples.