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Enrichment of deuterium oxide at hydrophilic interfaces in aqueous solutions
KTH, School of Chemical Science and Engineering (CHE), Chemistry.
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2007 (English)In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 23, no 24, 11943-11946 p.Article in journal (Refereed) Published
Abstract [en]

The structure of water at aqueous interfaces is of the utmost importance in biology, chemistry, and geology. We use neutron reflectivity and quartz crystal microbalance to probe an interface between hydrophilic quartz and bulk liquid solutions of H2O/D2O mixtures. We find that near the interface the neutron scattering length density is larger than in the bulk solution and there is an excess adsorbed mass. We interpret this as showing that there is a region adjacent to the quartz that is enriched in D2O and extends 5-10 nm into the solution. This suggests caution when interpreting results where D2O is substituted for H2O in aqueous interfacial chemistry.

Place, publisher, year, edition, pages
2007. Vol. 23, no 24, 11943-11946 p.
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Chemical Sciences
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URN: urn:nbn:se:kth:diva-37197DOI: 10.1021/la700932sISI: 000250976700001Scopus ID: 2-s2.0-36749089576OAI: oai:DiVA.org:kth-37197DiVA: diva2:432538
Note

QC 20110804

Available from: 2011-08-04 Created: 2011-08-04 Last updated: 2017-12-08Bibliographically approved

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