Enrichment of Deuterium Oxide at Hydrophilic Interfaces in Aqueous Solutions

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...

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Bibliographic Details
Published in:Langmuir 2007-11, Vol.23 (24), p.11943-11946
Main Authors: Stålgren, Johan J. R, Boschkova, Katrin, Ericsson, Jan-Christer, Frank, Curtis W, Knoll, Wolfgang, Satija, Sushil, Toney, Michael F
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Kemi
NATURAL SCIENCES
NATURVETENSKAP
Surface physical chemistry
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Summary: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.
ISSN:0743-7463
1520-5827
1520-5827
DOI:10.1021/la700932s