Long Range Hydration Effects in Electrolytic Free Suspended Black Films

Details Long Range Hydration Effects in Electrolytic Free Suspended Black Films Long Range Hydration Effects in Electrolytic Free Suspended Black Films

1998-06-16

arxiv.org/abs/cond-mat/9806186v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures, to be published Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.81.160

The force law within free suspended black films made of negatively charged Aerosol-OT (AOT) with added LiCl or CsCl is studied accurately using X-ray reflectivity (ca. 1{\AA}). We find an electrolyte concentration threshold above which a substantial additional repulsion is detected in the LiCl films, up to distances of 100 {\AA}. We interpret this phenomenon as an augmentation of the Debye screening length, due to the local screening of the condensed hydrophilic counterions by the primary hydration shell.

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