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Acid-Base Speciation of Carboxylate Ions in the Surface Region of Aqueous Solutions in the Presence of Ammonium and Aminium Ions
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
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2015 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 119, no 10, 4033-4040 p.Article in journal (Refereed) Published
Abstract [en]

The acid base speciation of surface-active carboxylate ions in the surface region of aqueous solutions was studied with synchrotron-radiation-based photoelectron spectroscopy. The protonated form was found at an extraordinarily large fraction compared to that expected from the bulk pH. When adding salts containing the weak acid NH4+ to the solution, the fraction of the acidic form at the surface increases, and to a Much greatet extent than expected from the bulk pH of the solution. We show that ammonium ions also are overrepresented in the surface region, and propose that the interaction between the surface-active anionic carboxylates and cationic ammonium ions creates a carboxylateammonium bilayer close to the surface, which increases the probability of the protonation of the carboxylae ions. By comparing the situation when a salt of the less volatile amine diethanolatnine is used, We also show that the observed evaporation of ammonia that occurs after such an event only affects the equilibrium marginally.

Place, publisher, year, edition, pages
2015. Vol. 119, no 10, 4033-4040 p.
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Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-251803DOI: 10.1021/jp509945gISI: 000351188300016PubMedID: 25700136OAI: oai:DiVA.org:uu-251803DiVA: diva2:808349
Available from: 2015-04-28 Created: 2015-04-24 Last updated: 2017-12-04Bibliographically approved

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Werner, JosephinaEkholm, VictorWalz, Marie-MadeleineBjörneholm, Olle

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