Shaloski, Michael A.; Gord, Joseph R.; Staudt, Sean; Quinn, Sarah L.; Bertram, Timothy H.; Nathanson, Gilbert M. (2017). Data From: Reactions of N₂O₅ with Salty and Surfactant-Coated Glycerol: Interfacial Conversion of Br^– to Br₂ Mediated by Alkylammonium Cations. In Center for Aerosol Impacts on Chemistry of the Environment (CAICE). UC San Diego Library Digital Collections. https://doi.org/10.6075/J0DN437M

Publication abstract: Gas−liquid scattering and product-yield experiments are used to investigate reactions of N₂O₅ with glycerol containing Br^- and surfactant ions. N₂O₅ oxidizes Br^- to Br₂ for every solution tested: 2.7 M NaBr, 0.03 M tetrahexylammonium bromide (THABr), 0.03MTHABr + 0.5MNaBr, 0.03MTHABr + 0.5MNaCl, 0.03MTHABr + 0.01 M sodium dodecyl sulfate (SDS), and 0.01 M cetyltrimethylammonium bromide (CTABr). N₂O₅ also reacts with glycerol itself to produce mono- and dinitroglycerin. Surface tension measurements indicate that 0.03 M THABr and 2.7 M NaBr have similar interfacial Br^- concentrations, though their bulk Br^- concentrations differ by 90-fold. We find that twice as much Br₂ is produced in the presence of THA+, implying that the conversion of Br^- to Br₂ is initiated at the interface, perhaps mediated by the charged, hydrophobic pocket within the surface THA⁺ cation. The addition of 0.5 M NaBr, 0.5 M NaCl, or 0.01 M SDS to 0.03 M THABr lowers the Br₂ production rate by 23%, 63%, and 67% of the THABr value, respectively. When CTA⁺ is substituted for THA⁺,Br₂ production drops to 12% of the THABr value. The generation of Br₂ under such different conditions implies that trace amounts of surface-active alkylammonium ions can catalyze interfacial N₂O₅ reactions, even when salts and other surfactants are present.

This package contains data and an explanatory readme file to reproduce figures 3-7 of “Reactions of N₂O₅ with Salty and Surfactant-Coated Glycerol: Interfacial Conversion of Br^– to Br₂ Mediated by Alkylammonium Cations”.

• Time period of project: 2014-04-01 to 2016-01-01

• 2017

• Shaloski, Michael A.

• Bertram, Timorthy H.
• Gord, Joseph R.
• Nathanson, Gilbert M.
• Quinn, Sarah L.
• Shaloski, Michael A.
• Staudt, Sean

• Nathanson, Gilbert M.

• Heterogeneous reaction
• Liquid–gas scattering
• Microjet
• N2O5
• Sea spray aerosol (SSA)

• data

Doi: https://doi.org/10.6075/J0DN437M

Primary associated publication

• Shaloski, M. A.; Gord, J. R.; Staudt, S.; Quinn, S. L.; Bertram, T. H.; Nathanson, G. M. Reactions of N2O5 with Salty and Surfactant-Coated Glycerol: Interfacial Conversion of Br– to Br2 Mediated by Alkylammonium Cations. J. Phys. Chem. A. (2017). 121, 3708–3719. https://doi.org/10.1021/acs.jpca.7b02040

Other version

• Alternate project file location: https://doi.org/10.4246/caice-mshaloski_gnathanson_jpca2017_20170512_mshaloski_gnathanson_jpca2017md58e8096e7c922509a9a6b9c53959d53cc.zip

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2023-05-22