Ion-specific induced charges at aqueous soft interfaces.

  title={Ion-specific induced charges at aqueous soft interfaces.},
  author={Wenjie Wang and Rebecca Y Park and Alex Travesset and David Vaknin},
  journal={Physical review letters},
  volume={106 5},
Ionic specificity effects, i.e., ions of the same valence leading to different macroscopic effects, are studied by considering a Langmuir monolayer of arachidic acid over a solution containing either Fe(3+) or La(3+). We systematically vary pH levels as a way to control the interfacial surface charge and characterize the system by surface-sensitive x-ray scattering and spectroscopic techniques. We show that the critical surface pressure at the tilted (L2) to untilted (LS) transition is ionic… CONTINUE READING

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