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MM: Fachverband Metall- und Materialphysik

MM 60: Nanomaterials - Nanoparticles

MM 60.1: Vortrag

Donnerstag, 14. März 2013, 15:45–16:00, H25

Tuning of silver ion release properties of silver-polymer nanocomposites — •Nisreen Alissawi, Vladimir Zaporojtchenko, Thomas Strunskus, and Franz Faupel — Institute for Materials Science - Multicomponent Materials, Faculty of Engineering, Christian-Albrechts-University (CAU) Kiel, Kaiser Str. 2, 24143, Kiel, Germany

The tuning of silver ion release is very important for biomedical applications of silver nanocomposite materials to reduce the potential toxicity effects towards human cells and the environment. In this work a well defined model system consisting of nearly two dimensional silver nanoparticle ensembles deposited on the surface of a polymer matrix was used to study the influence of different parameters on the silver ion release. Samples were prepared by physical vapor deposition (PVD) techniques. The effect on Ag ion release kinetics was investigated in dependence of the composite morphology (Ag nanoparticle size, concentration, and distribution), for nanocomposites containing silver (Ag) and gold (Au) as alloy nanoparticles with different composition, or with a polymer barrier on top of the NPs. Composition and the time-dependent release of silver ions after immersion in water were examined by a combination of techniques. Increasing the gold fraction in Ag-Au alloy NPs leads to a strong improvement of the oxidation resistance of the AgNPs. Moreover, a polymer barrier stabilizes the morphology of the composites and allows controlling the Ag ion release rate.