AI Article Synopsis
- The study examines how absolute ion concentration varies in polyelectrolyte multilayer films created by alternating layers of polyanions and polycations.
- Using standing-wave X-ray fluorescence, researchers found that the outermost layer's charge and washing process significantly influence the concentration and distribution of bromide ions within the films.
- Results indicate that films with PSS on top have lower bromide ion content compared to PAH-terminated films, and washing with water does not completely eliminate all ions even after 6 hours.
Article Abstract
Absolute ion concentration and its profile across polyelectrolyte multilayer films were studied. The films were prepared by alternating adsorption of polyanions and polycations from aqueous solution. Standing-wave X-ray fluorescence was used to map the ion profile. The well-studied multilayer system PSS/PAH was investigated, and bromide ions were used as probe entities. The results show that the sign of the charge of the outermost layer and the washing procedure after finishing the preparation have a decisive effect on the ion concentration and the ion profile. Multilayers with PSS as the outermost layer contain fewer bromide ions than the PAH-terminated multilayers. Exposure to water washes the ions out, but even after 6 h of washing, not all of the bromide ions had been removed.
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| http://dx.doi.org/10.1021/jp068715x | DOI Listing |
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