Berlin 2012 – scientific programme

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DS: Fachverband Dünne Schichten

DS 34: Organic thin films II: Interface spectroscopy

DS 34.6: Talk

Thursday, March 29, 2012, 16:15–16:30, H 2032

Effect of ionic strength on self-assembly and surface properties of oligoelectrolyte multilayers — •Samantha Micciulla, Chloé Chevigny, and Regine v.Klitzing — Technische Universität Berlin, Deutschland

Polyelectrolyte multilayers are self-assembled systems which have found many applications since their introduction in the early nineties. Easiness of preparation and properties tunability have induced an increasing interest in the field of surface modification. This requires a deep understanding of their structural features and of the tools to control their response to different surrounding environments.
The effect of key parameters (pH, dipping time, concentration, functionality, charge density) has been largely studied. Our interest is now focused on the effect of chain length. Namely, we decided to go down to the oligomeric limit (30 monomers/chain) to test the achievement of layer-by-layer multilayer growth and understand how the molecular weight influences the resulting system.
The combination of optical (Ellipsometry) and acoustic (Atomic Force Microscopy (AFM) and Quarzt Crystal Microbalance with Dissipation (QCM-D) ) techniques offers an overall description of surface and rheological properties, pointing out the effect of ionic strength in solution on OEM self-assembly, as well as analogies and differences with their high molecular weight equivalents.