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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 47: Charged Soft Matter

CPP 47.3: Vortrag

Freitag, 15. März 2013, 10:15–10:30, H34

Substrate Dominated versus Bulk Phase Dominated Polyelectrolyte Multilayer: The Swelling Effect — •Maximilian Zerball and Regine von Klitzing — Institute of Chemistry, Stranski- Laboratorium, TU Berlin, 10623 Berlin, Str. 17.Juni 124

For the past twenty years, the Layer-by-Layer technique (LbL) has made it possible to modify surfaces by covering them with thin films. This technique gives the opportunity for a wide variety of potential applications for polyelectrolyte multilayers (PEM), for example chemical reactors, antireflective coatings or microcontainers. For all these applications, it is from greatest interest to control thickness and structure of the film perfectly. Additionally it is important to know how external stimuli change the film properties.

The thickness, more precisely the distance of the film/air interface away from the substrate influences the structure of the film. For the initial layers the structure is mainly influenced by the chemical nature of the substrate. After a certain number of layers the effect of the substrate vanishes completely and the PEM properties are mainly dominated by the bulk behavior of the polyelectrolyte system. Further, these structure changes influencing the swelling behavior of the PEM.

This study is focusing on the correlation between the structure and the swelling behavior of PEM in these two different regimes. For that purpose, the properties of the PEM are monitored after the deposition as a function of the number of layers by Ellipsometry, Atomic Force Microscopy and X-Ray Reflectometry under different relative humidity.