Surface Composition of Free Mixed NaCl/Na2 SO4 Nanoscale Aerosols Probed by X-ray Photoelectron Spectroscopy

The Journal of Physical Chemistry. a
E AntonssonE Rühl

Abstract

The local chemical surface composition of unsupported mixed solid NaCl/Na2SO4aerosols ( d ∼ 70 nm) is studied by X-ray photoelectron spectroscopy. The solid aerosols are generated by drying aqueous droplets containing mixtures of the two salts in different mole fractions. The mole fraction of these salts is found to deviate at the solid aerosol surface significantly from the initial droplet composition. The minority species in the droplets are found to be enhanced at the surface of the solid mixed aerosols. This surface enhancement is rationalized in terms of the nucleation/crystallization process, where the salts evidently do not cocrystallize, rather than each salt forms pure crystal moieties. Characteristic variations of the surface ion concentration as a function of the mole fraction of the salts in the initial droplet are observed in the nanometer size regime. This is unlike core-shell architectures previously found in mixed micron salt aerosols, indicating that aerosol models derived from micron-sized aerosols are evidently not fully reliable to describe the surface composition of nanosized aerosols. Furthermore, surface enhancement of the minority component in mixed NaCl/Na2SO4aerosols is also different from previous res...Continue Reading

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Citations

May 30, 2019·Physical Chemistry Chemical Physics : PCCP·E AntonssonE Rühl
Feb 23, 2020·Annual Review of Physical Chemistry·Loren BanRuth Signorell

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