Long Range Hydration Effects in Electrolytic Free Suspended Black Films
D. Sentenac, J.J. Benattar
TL;DR
This study investigates how electrolytes like LiCl and CsCl affect the force interactions in free suspended black films, revealing a threshold electrolyte concentration that enhances repulsion due to increased Debye screening length.
Contribution
It provides the first detailed measurement of electrolyte-induced long-range forces in black films using high-resolution X-ray reflectivity.
Findings
Electrolyte concentration threshold causes increased repulsion.
LiCl induces a longer-range repulsion than CsCl.
Enhanced Debye screening length explains the observed forces.
Abstract
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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