Electrical stiffness modulation-confirming the impact of surface excess elasticity on the mechanics of nanomaterials

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	Electrical stiffness modulation-confirming the impact of surface excess elasticity on the mechanics of nanomaterials
	N. Mameka; J. Markmann; H. J. Jin; J. Weissmuller
	2014
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	76 页码:272-280
摘要	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(-1), 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. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[mameka, nadiia ; markmann, juergen ; weissmueller, joerg] helmholtz zentrum geesthacht, inst werkstofforsch, d-21502 geesthacht, germany. [markmann, juergen ; weissmueller, joerg] tech univ hamburg, inst werkstoffphys & technol, d-21073 hamburg, germany. [jin, hai-jun] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; mameka, n (reprint author), helmholtz zentrum geesthacht, inst werkstofforsch, d-21502 geesthacht, germany. ; nadiia.mameka@hzg.de
关键词	Surface Excess Elasticity Surface Stress Nanoporous Dynamic Mechanical Analysis Nanostructures Stress-charge Response Nanoporous Gold Youngs Modulus Metal Adsorption Strain Au(111) Solids Au Reconstruction
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73338
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	N. Mameka,J. Markmann,H. J. Jin,et al. Electrical stiffness modulation-confirming the impact of surface excess elasticity on the mechanics of nanomaterials[J]. Acta Materialia,2014,76:272-280.
APA	N. Mameka,J. Markmann,H. J. Jin,&J. Weissmuller.(2014).Electrical stiffness modulation-confirming the impact of surface excess elasticity on the mechanics of nanomaterials.Acta Materialia,76,272-280.
MLA	N. Mameka,et al."Electrical stiffness modulation-confirming the impact of surface excess elasticity on the mechanics of nanomaterials".Acta Materialia 76(2014):272-280.