Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: Poster: Interfaces and Thin Films
CPP 14.5: Poster
Montag, 22. März 2010, 16:30–18:00, Poster C
Block Architecture for Neutron Reflectivty Investigation of Internal Interfaces of Polyelectrolyte Multilayers — •Olaf Soltwedel1, Oxana Ivanova1, Madlen Müller1, Ralf Köhler2, and Christiane A. Helm1 — 1Institut für Physik, Ernst-Moritz-Arndt Universität, Felix-Hausdorff-Str. 6, D-17489 Greifswald, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energien, Glienicker Straße 100, D-14109 Berlin, Germany
Polyelectrolyte multilayer (PEM) are built by sequential adsorption of oppositely charged polyelectrolytes, either poly(styrenesulfonate) - pSS and poly(diallyldimethylammonium) - pDADMAC or poly(allylamine hydrochloride) - pAH solutions. Using neutron reflectivity and a two block PEM architecture, one block consisting of protonated polyelectrolyte bilayers only and one of deuterated bilayers, it is possible to quantify unambiguously the scattering length density and the thickness of the respective blocks. Also, the internal roughness of the interface between the blocks is determined. While the total number of deposited layers is kept constant, the ratio between the protonated and the deuterated block is varied systematically. Different growth zones, i.e. the precursor zone adjacent to the substrate, the core zone and the outer zone next to the air can be distinguished. Depending on the polycation used, not only the internal roughness but also the extension of the zones change within the PEM. Also annealing effects, which appear during preparation of PEM and or after treatment with salt solutions, are investigated with this approach.