Noncapillary-wave structure at the water-alkane interface |
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Authors: | Mitrinović D M Tikhonov A M Li M Huang Z Schlossman M L |
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Institution: | University of Illinois at Chicago, Department of Physics, 845 West Taylor Street, Chicago, Illinois 60607, USA. |
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Abstract: | Synchrotron x-ray reflectivity is used to study the interface between bulk water and bulk n-alkanes with carbon numbers 6 through 10, 12, 16, and 22. For all interfaces, except the water-hexane interface, the interfacial width disagrees with the prediction from capillary-wave theory. The variation of interfacial width with carbon number can be described by combining the capillary-wave prediction for the width with a contribution from intrinsic structure. This intrinsic structure is determined by the gyration radius for the shorter alkanes and by the bulk correlation length for the longer alkanes. |
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