Abstract
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 flourescence (EDX), and atomic force microscopy (AFM). Results indicates 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 635 nm x 635 nm x 53 nm. 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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 995-998 |
| Number of pages | 4 |
| Journal | Geophysical Research Letters |
| Volume | 28 |
| Issue number | 6 |
| DOIs | |
| State | Published - Mar 15 2001 |
| Externally published | Yes |
ASJC Scopus subject areas
- Geophysics
- General Earth and Planetary Sciences
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