Publisher DOI: 10.1016/j.actamat.2014.04.067
Title: Electrical stiffness modulation : confirming the impact of surface excess elasticity on the mechanics of nanomaterials
Language: English
Authors: Mameka, Nadiia 
Markmann, Jürgen 
Jin, Hai-Jun 
Weissmüller, Jörg 
Keywords: Dynamic mechanical analysis; Nanoporous; Nanostructures; Surface excess elasticity; Surface stress
Issue Date: 13-Jun-2014
Source: Acta Materialia 76: 272-280 (2014)
Abstract (english): 
Local variations in the stiffness at surfaces may affect the elastic response of nanostructures, yet experiments disagree on the magnitude and even sign of the surface excess elastic constants. The present study reports the variation in the effective macroscopic stiffness of bulk samples of nanoporous gold when the surface state is modulated under potential control in an electrochemical environment. Using in situ experiments in a dynamic mechanical analyzer to measure the storage and loss moduli, we show that adsorption of ≤1 atomic monolayer of oxygen species as well as a capacitively controlled excess of electrons at the surface stiffen the material, while oxygen desorption/electron depletion enhance the compliance. Relative changes in the effective stiffness of up to 8% imply the variation of a surface excess elastic constant of the order of 60 N m , much larger than the absolute value of that constant deduced from previous atomistic simulation studies of clean surfaces. Since the electrode potential affects exclusively the surface, our observations provide conclusive evidence for the impact of local stiffness variation at surfaces on the effective elastic response of nanostructures. © 2014 Elsevier Ltd. All rights reserved. -1
ISSN: 1359-6454
Journal: Acta materialia 
Institute: Werkstoffphysik und -technologie M-22 
Document Type: Article
Funded by: Deutsche Forschungsgemeinschaft (DFG) 
More Funding information: This work was supported by Deutsche Forschungsgemeinschaft through Grant WE1424/14-1.
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