Dresden 2006 – wissenschaftliches Programm
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MM: Metall- und Materialphysik
MM 38: Nanostructured Materials II
MM 38.3: Vortrag
Donnerstag, 30. März 2006, 17:00–17:15, IFW D
Nanoporous Metals Obtained by Dealloying and their Charge-dependent Strain — •Dominik Kramer1, Smrutiranjan Parida1, and Jörg Weissmüller1,2 — 1Forschungszentrum Karlsruhe, Institut für Nanotechnologie, Karlsruhe — 2Universität des Saarlandes, Fachrichtung Technische Physik, Saarbrücken
It has been suggested recently [1] to use nanostructured metals obtained by dealloying for actuator applications: Dealloying by the selective dissolution of the less noble component(s) of an alloy, is an important and convenient route to prepare nanoporous metal and alloy samples of arbitrary size and shape, and it ensures that all the pores are filled with electrolyte solution. Due to the dependence of the surface stress on the surface charge, it is possible to use nanostructured metals in an electrolyte as actuator materials, by using a counter electrode in the same electrolyte [1].
We present a study of the dealloying of silver-gold-platinum and palladium alloys, and a dilatometer investigation of the reversible strain of the resulting structures in various electrolytes. The strain measured is discussed as a function of potential, and of the structure size and composition of the different samples.
[1] D. Kramer, R. N. Viswanath, J. Weissmüller, Nano Lett. 4 (2004) 793