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Type: Artigo de periódico
Title: Interfacial water dielectric-permittivity-profile measurements using atomic force microscopy
Author: Teschke, O
Ceotto, G
de Souza, EF
Abstract: 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 epsilon approximate to4 at the interface and increasing to epsilon =80 about 10 nm from the surface suggests a reorientation of water molecule dipoles in the presence of the mica interfacial charge.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevE.64.011605
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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