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Water dynamics at neutral and ionic interfaces

Fenn, Emily E ; Wong, Daryl B ; Fayer, M.D

Proceedings of the National Academy of Sciences - PNAS, 2009-09, Vol.106 (36), p.15243-15248 [Periódico revisado por pares]

United States: National Academy of Sciences

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  • Título:
    Water dynamics at neutral and ionic interfaces
  • Autor: Fenn, Emily E ; Wong, Daryl B ; Fayer, M.D
  • Assuntos: Alcohols ; Anisotropy ; Biological Sciences ; Charged particles ; Hydrogen Bonding ; Hydrogen bonds ; Hydroxides - chemistry ; Hydroxyls ; Infrared radiation ; Ions ; Micelles ; Molecules ; Physical Sciences ; Relaxation time ; Spectrophotometry, Infrared ; Spectrum analysis ; Studies ; Surface-Active Agents - chemistry ; Surfactants ; Virtual water ; Water ; Water - chemistry
  • É parte de: Proceedings of the National Academy of Sciences - PNAS, 2009-09, Vol.106 (36), p.15243-15248
  • Notas: Contributed by M. D. Fayer, July 15, 2009
    Author contributions: E.E.F. and M.D.F. designed research; E.E.F. and D.B.W. performed research; E.E.F. and D.B.W. contributed new reagents/analytic tools; E.E.F., D.B.W., and M.D.F. analyzed data; and E.E.F. and M.D.F. wrote the paper.
  • Descrição: The orientational dynamics of water at a neutral surfactant reverse micelle interface are measured with ultrafast infrared spectroscopy of the hydroxyl stretch, and the results are compared to orientational relaxation of water interacting with an ionic interface. The comparison provides insights into the influence of a neutral vs. ionic interface on hydrogen bond dynamics. Measurements are made and analyzed for large nonionic surfactant Igepal CO-520reverse micelles (water nanopool with a 9-nm diameter). The results are compared with those from a previous study of reverse micelles of the same size formed with the ionic surfactant Aerosol-OT (AOT). The results demonstrate that the orientational relaxation times for interfacial water molecules in the two types of reverse micelles are very similar (13 ps for Igepal and 18 ps for AOT) and are significantly slower than that of bulk water (2.6 ps). The comparison of water orientational relaxation at neutral and ionic interfaces shows that the presence of an interface plays the dominant role in determining the hydrogen bond dynamics, whereas the chemical nature of the interface plays a secondary role.
  • Editor: United States: National Academy of Sciences
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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