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    Enrichment of Deuterium Oxide at Hydrophilic Interfaces in Aqueous Solutions

    Year: 2007

    Journal: Langmuir, Vol. 23, No. 24, 2007, 20100827

    Authors: Stålgren J.J.R †, Boschkova K. ‡, Ericsson J-C §, Frank C.W. †, Knoll W. |, Satija S. ^, Toney M.F. * £

    Last authors: Michael F. Toney

    Organizations: Department of Chemical Engineering, Stanford University, Stanford, California 94305, Institute for Surface Chemistry, Box 5607, SE-114 86 Stockholm, Sweden, Department of Chemistry, Surface Chemistry, Royal Institute of Technology, Box 5607, SE-100 44 Stockholm, Sweden, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany, NIST Center for Neutron Scattering, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, and Stanford Synchrotron Radiation Laboratory, Stanford Linear Accelerator Center, Menlo Park, California 94025

    Country: USA, US, United States of America

    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.