Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Focused Session: Confinement of Polymers in Nanoscopic Layers - How Much do Properties Change? II

CPP 16.3: Talk

Tuesday, March 15, 2011, 15:00–15:15, ZEU 160

Substrate influence on the structure and properties of polyelectrolyte multilayers — •Chloe Chevigny, Maximilian Zerball, and Regine von Klitzing — Stranski Lab., TU Berlin, Institut für Chemie, Sekr. TC 9, 10623 Berlin

Polyelectrolyte Multilayers (PEM), made by the Layer-by-Layer (LbL) deposition technique, are a very versatile and interesting tool for many technical applications. Since their development 20 years ago, there has been an exponential increase of works in this topic, allowing a better comprehension of their structures and properties, but also more applied studies, resulting in many applications such as sensor coatings or drug delivery systems. However, in order to better understand the functionalities of these systems and find new applications, fundamental studies are always needed. We focus on the properties profile across the film and on the effect of the solid substrate: over which length scale the substrate affects the film properties, and from which distance does the film reach bulk properties? For this project several surfaces types are studied: Silicon and Gold (resp. negatively and positively charged), with or without a first protective layer of PolyEthyleneImine PEI. The structure, as well as the swelling and dynamical properties of the multilayers, are determined via a combination of ellipsometry, X-rays and neutron reflectivity, QCM-D and FRAP measurements. The substrate is found to have an important influence, both on internal structure (layers inter-diffusion increases linearly from top to bottom) and properties (changing the substrate changes both diffusion and swelling features) of the multilayers.