Phys. Rev. E 64, 011605 (2001) [10 pages]Interfacial water dielectric-permittivity-profile measurements using atomic force microscopyReceived 19 January 2001; published 27 June 2001 The arrangement of water molecules at charged aqueous interfaces is an important question in biology, electrochemistry, and geochemistry. Theoretical studies suggest that the molecules become arranged in several layers adjacent to a solid interface. Using atomic force microscopy we have measured the water dielectric-permittivity profile perpendicular to mica surfaces. The measured variable permittivity profile starting at ε≈4 at the interface and increasing to ε=80 about 10 nm from the surface suggests a reorientation of water molecule dipoles in the presence of the mica interfacial charge. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevE.64.011605
DOI:
10.1103/PhysRevE.64.011605
PACS:
68.08.-p, 68.37.Ef, 77.22.Ch, 77.55.+f
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