D
Denis Kramer
Researcher at University of Southampton
Publications - 99
Citations - 7181
Denis Kramer is an academic researcher from University of Southampton. The author has contributed to research in topics: Chemistry & Proton exchange membrane fuel cell. The author has an hindex of 39, co-authored 87 publications receiving 6228 citations. Previous affiliations of Denis Kramer include Imperial College London & University of Minnesota.
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Journal ArticleDOI
Surface-chemistry-driven actuation in nanoporous gold
Jürgen Biener,Arne Wittstock,Arne Wittstock,Luis A. Zepeda-Ruiz,Monika M. Biener,Volkmar Zielasek,Denis Kramer,R. N. Viswanath,Jörg Weissmüller,Marcus Bäumer,A. V. Hamza +10 more
TL;DR: This work demonstrates that surface-chemistry-driven actuation can be realized in high-surface-area materials such as nanoporous gold, and achieves reversible strain amplitudes of the order of a few tenths of a per cent by alternating exposure of nanoporous Au to ozone and carbon monoxide.
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Charge-induced reversible strain in a metal.
TL;DR: It is shown that reversible strain amplitudes comparable to those of commercial piezoceramics can be induced in metals by introducing a continuous network of nanometer-sized pores with a high surface area and by controlling the surface electronic charge density through an applied potential relative to an electrolyte impregnating the pores.
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Volume change during the formation of nanoporous gold by dealloying.
Smrutiranjan Parida,Denis Kramer,Cynthia A. Volkert,Harald Rösner,Jonah Erlebacher,Jörg Weissmüller +5 more
TL;DR: It is suggested that the formation of nanoporous gold in the authors' experiments is accompanied by the creation of a large number of lattice defects and by local plastic deformation.
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Non-linear deformation mechanisms during nanoindentation
TL;DR: In this article, a superdislocation model was proposed to predict the yield point during indentation of tungsten and an iron alloy using the change in shear stress between the elastically and fully plastic loading conditions.
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Approaching the theoretical strength in nanoporous Au
TL;DR: In this paper, the yield strength of the 15nm diameter ligaments is estimated to be 1.5GPa, close to the theoretical strength of Au, and the absolute size of ligaments and cell walls can be used to tailor foam properties.