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X-Ray Scattering Studies of Organic Monolayers on Electrolytic Solutions: Arachidic Acid on CdCl2

  • K. Kjaer
  • J. Als-Nielsen
  • R. M. Kenn
  • C. Böhm
  • P. Tippmann-Krayer
  • C. A. Helm
  • H. Möhwald
  • F. Leveiller
  • D. Jacquemain
  • M. Lahav
  • L. Leiserowitz
  • M. Deutsch
Conference paper
Part of the Springer Proceedings in Physics book series (SPPHY, volume 61)

Abstract

The interaction between a charged monolayer of fatty acid molecules on the surface of a CdCl2 aqueous solution and the ions below has been investigated by means of X-ray Reflection and Grazing-Incidence Diffraction. A stoichiometric, localised layer of Cd++ ions forms an epitaxial 2×3 superstructure below the 2D-crystalline fatty acid monolayer.

Keywords

Arachidic Acid Electron Density Profile Full Curve Vertical Density Profile Organic Monolayer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. [1]
    G. L. Gaines, “Insoluble Monolayers at Liquid-Gas Interfaces”; Interscience: New York (1966).Google Scholar
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    K. Kjaer, J. Als-Nielsen, C. A. Helm, P. Tippmann-Krayer and H. Möhwald, J. Phys. Chem. 93, pp. 3200–6 (1989).CrossRefGoogle Scholar
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    In ref. [2], pH was adjusted with NaOH and could not be determined very accurately. We estimate now that pH was about 7, high enough to completely dissociate COOH to COO-. At higher pH, precipitation occurs [4].Google Scholar
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    Gmelins Handbuch der Anorganischen Chemie, 33:Cadmium, p. 436. Eighth edition (1959).Google Scholar
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    J. Als-Nielsen and K. Kjaer, In: “Phase Transitions in Soft Condensed Matter”; T. Riste and D. Sherrington, Eds; Proc. NATO ASI Series B 211, Plenum: New York, pp. 113–138 (1989).Google Scholar
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    F. Leveiller, D. Jacquemain, M. Lahav, L. Leiserowitz, M. Deutsch, K. Kjaer and J. Als-Nielsen, Science 252, pp. 1532–1536 (1991).Google Scholar
  7. [7]
    pH was adjusted with NH3 and measured to within 0.1. The use of NH3 allows pH ≤ 8.8 due to the formation of the complexe Cd(NH3)++ 4 (cf. ref. [4], p.443). At higher pH we observed the precipitation of a fine white powder.Google Scholar
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    Cf. G. Vineyard, Phys. Rev. B 26, pp. 4146–4159 (1982) and papers in this volume.ADSCrossRefGoogle Scholar
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    F. Leveiller et al., to be published (1991).Google Scholar
  10. [10]
    Five parameters were adjusted to fit ten observed intensities.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1992

Authors and Affiliations

  • K. Kjaer
    • 1
  • J. Als-Nielsen
    • 1
  • R. M. Kenn
    • 2
  • C. Böhm
    • 2
  • P. Tippmann-Krayer
    • 2
  • C. A. Helm
    • 2
  • H. Möhwald
    • 2
  • F. Leveiller
    • 3
  • D. Jacquemain
    • 3
  • M. Lahav
    • 3
  • L. Leiserowitz
    • 3
  • M. Deutsch
    • 4
  1. 1.Physics DepartmentRisø National LaboratoryRoskildeDenmark
  2. 2.Physical Chemistry DepartmentMainz UniversityMainzFed. Rep. of Germany
  3. 3.Structural Chemistry DepartmentWeizmann InstituteRehovotIsrael
  4. 4.Physics DepartmentBar-Ilan UniversityRamat-GanIsrael

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