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MM: Fachverband Metall- und Materialphysik

MM 17: Poster Session

MM 17.43: Poster

Montag, 26. März 2012, 17:00–19:00, Poster B

Study of viscoelastic properties of nanoporous gold using dynamic mechanical analysis — •Nadiia Mameka¹, Jürgen Markmann^{1, 2}, and Jörg Weissmüller^{1, 2} — ¹Helmholtz-Zentrum Geesthacht, Institut für Werkstoffforschung, Werkstoffmechanik, 21502 Geesthacht, Germany — ²Technische Universität Hamburg-Harburg, Institut für Werkstoffphysik und -technologie, 21073 Hamburg, Germany

Nanoporous (np) metals fabricated by alloy corrosion have attracted a considerable attention due to their high specific surface area and open nanoligament structure, which can be modified chemically or electrochemically. Unlike bulk nanocrystalline materials, here one can expect not only size-dependence effects of mechanical properties but also significant influence of capillary forces on the elastic and plastic behavior. Recently, it was shown that the mechanical strength of np-Au imbibed with electrolyte can be changed by a factor of 2 by controlling the electrode potential [1]. The aim of this study is the investigation of the change of elasticity of np metals in response to potential changes. We present in-situ experiments in a dynamic mechanical analysis device equipped with an electrochemical cell. The measurements were carried out while electric potentials are applied to a np-Au sample immersed in an electrolyte. Measured storage and loss moduli as well as the damping coefficient upon changing the surface state are discussed.

1. H.J. Jin, J. Weissmüller, Science, 332, 1179 (2011).