Physics
Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..995z&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 6, p. 995-998
Physics
8
Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry
Scientific paper
Surface segregation of NaBr in mixed NaBr/NaCl crystals precipitated from aqueous solutions containing Br is investigated. Crystals were grown from solutions of a wide range of Br:Cl values and studied using x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), energy-dispersive x-ray fluorescence (EDX), and atomic force microscopy (AFM). Results indicate that NaBr surface-segregates to cover 4-5% of the surface at the Br:Cl value found in sea water (1:660). The surface NaBr:NaCl values are 35 times higher those of the bulk crystals. The surface NaBr forms domains of average size 635nm×635nm×53nm. Large areas of the surface contain NaCl with no detectable NaBr. Complete surface segregation of all Br found in sea salt particles is likely to occur, thereby making a greater amount of Br available for surface reactions with gas-phase constituents than would be predicted based on bulk composition.
Pemberton Jeanne E.
Turner Jessica A.
Zangmeister Christopher D.
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