Articles | Volume 14, issue 7
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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Cited articles

Bain, A. and Preston, T. C.: The wavelength-dependent optical properties of weakly absorbing aqueous aerosol particles, Chem. Commun., 56, 8928–8931,, 2020. 
Barley, M. H., Topping, D. O., and McFiggans, G.: Critical Assessment of Liquid Density Estimation Methods for Multifunctional Organic Compounds and Their Use in Atmospheric Science, J. Phys. Chem. A, 117, 3428–3441,, 2013. 
Bilde, M. and Pandis, S. N.: Evaporation Rates and Vapor Pressures of Individual Aerosol Species Formed in the Atmospheric Oxidation of α- and β-Pinene, Environ. Sci. Technol., 35, 3344–3349,, 2001. 
Bones, D. L., Reid, J. P., Lienhard, D. M., and Krieger, U. K.: Comparing the mechanism of water condensation and evaporation in glassy aerosol, Proc. Natl. Acad. Sci. USA, 109, 11613–11618,, 2012. 
Cai, C., Stewart, D. J., Reid, J. P., Zhang, Y., Ohm, P., Dutcher, C. S., and Clegg, S. L.: Organic Component Vapor Pressures and Hygroscopicities of Aqueous Aerosol Measured by Optical Tweezers, J. Phys. Chem. A, 119, 704–718,, 2014. 
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.