Retrieving the translational diffusion coefficient of water from experiments on single levitated aerosol droplets

Daniel M. Lienhard, Andrew J. Huisman, David L. Bones, Yiea Funk Te, Bei P. Luo, Ulrich K. Krieger*, Jonathan P. Reid

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

47 Citations (Scopus)

Abstract

The time-dependent growth and shrinkage of aqueous aerosol particles trapped in an electrodynamic balance exposed to changes in relative humidity (RH) depend on the translational diffusion coefficient of water (D H2O). Resonances in the Mie scattering patterns of the illuminated micrometre-sized droplets are used to follow the compositional evolution through stepwise changes in RH. Under conditions where the diffusion of water molecules becomes sufficiently slow, e.g. in the highly viscous or even glassy regime, the concentration and temperature dependent values of D H2O can be determined iteratively by comparing the observed shifts in the Mie resonant wavelengths with predicted shifts from a diffusion model of a multi-layered sphere. It is shown that condensation and evaporation of water vapour from or to highly viscous or glassy droplets follow different kinetic regimes, a result that is consistent with previous studies of adsorption and desorption on glassy surfaces. This journal is

Original languageEnglish
Pages (from-to)16677-16683
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number31
DOIs
Publication statusPublished - 21 Aug 2014

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