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Polynuclear Speciation of Trivalent Cations near the Surface of an Electrolyte Solution.
- Source :
-
Langmuir : the ACS journal of surfaces and colloids [Langmuir] 2015 May 19; Vol. 31 (19), pp. 5432-9. Date of Electronic Publication: 2015 May 05. - Publication Year :
- 2015
-
Abstract
- Despite long-standing efforts, there is no agreed upon structural model for electrolyte solutions at air-liquid interfaces. We report the simultaneous detection of the near-surface and bulk coordination environments of a trivalent metal cation (europium) in an aqueous solution by use of X-ray absorption spectroscopy. Within the first few nanometers of the liquid surface, the cations exhibit oxygen coordination typical of inner-sphere hydration of an aquated Eu(3+) cation. Beyond that, outer-sphere ion-ion correlations are observed that are otherwise not present in the bulk electrolyte. The combination of near-surface and bulk sensitivities to probe metal ion speciation in electrolyte solutions is achieved by detecting electron-yield and X-ray fluorescence signals from an inverted pendant drop. The results provide new knowledge about the near-surface chemistry of aqueous solutions of relevance to aerosols and ion transport processes in chemical separations and biological systems.
Details
- Language :
- English
- ISSN :
- 1520-5827
- Volume :
- 31
- Issue :
- 19
- Database :
- MEDLINE
- Journal :
- Langmuir : the ACS journal of surfaces and colloids
- Publication Type :
- Academic Journal
- Accession number :
- 25909822
- Full Text :
- https://doi.org/10.1021/acs.langmuir.5b01354