TY - JOUR
T1 - Segregation of NaBr in NaBr/NaCl crystals grown from aqueous solutions
T2 - Implications for sea salt surface chemistry
AU - Zangmeister, C. D.
AU - Jessica, A. T.
AU - Pemberton, J. E.
PY - 2001/3/15
Y1 - 2001/3/15
N2 - 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.
AB - 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.
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U2 - 10.1029/2000GL012539
DO - 10.1029/2000GL012539
M3 - Article
AN - SCOPUS:0035866858
VL - 28
SP - 995
EP - 998
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 6
ER -