Structure of the orthoclase (001)- and (010)-water interfaces by high-resolution X-ray reflectivity |
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Authors: | P Fenter L Cheng Z Zhang NC Sturchio |
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Institution: | 1 Environmental Research Division, Argonne National Laboratory, Argonne, IL 60439, USA 2 Dept. of Materials Science and Engineering, Northwestern Univ., Evanston, IL 60208, USA 3 Dept. of Earth and Environmental Sciences, Univ. of Illinois at Chicago, Chicago, IL 60607, USA |
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Abstract: | High-resolution in situ X-ray specular reflectivity was used to measure the structures of orthoclase (001) and (010) cleavage surfaces in contact with deionized water at 25°C. X-ray reflectivity data demonstrate a high degree of structural similarity between these two orthoclase-water interfaces. Both interfacial structures include cleavage along the plane of minimal bond breakage resulting in surfaces terminated by non-bridging oxygens; structured water within 5 Å of the orthoclase surface (consisting of adsorbed species at the surface and layered water above the surface), with a featureless water profile beyond 5 Å; substitution of outermost K+ ions by an oxygen containing species (presumably H3O+); and small structural displacements of the near surface atoms. The interfacial water structure, in comparison with recent results for other mineral-water interfaces, is intermediate between the minimal structure found at calcite-, barite-, and quartz-water interfaces and the more extensive structure found at the muscovite-water interface. |
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