| Surface-driven actuation: Sign reversal under load and surface load-memory effect | |
| Liu, Ling-Zhi1,2; Mameka, Nadiia1; Markmann, Juergen1,3; Jin, Hai-Jun2; Weissmueller, Joerg1,3 | |
| 通讯作者 | Liu, Ling-Zhi(lingzhi.liu@hzg.de) |
| 2019-06-24 | |
| 发表期刊 | PHYSICAL REVIEW MATERIALS
 |
| ISSN | 2475-9953 |
| 卷号 | 3期号:6页码:7 |
| 摘要 | Motivated by suggestions that hybrid nanomaterials from nanoporous metal and aqueous electrolyte can be used as actuators, we study the impact of an external load on the actuation behavior of nanoporous gold impregnated with aqueous electrolyte. At no load, we observe the well-documented trend for a more positive electrode potential prompting elongation of the nanoporous body. For purely capacitive electrode processes we confirm that the elastic response to external load is simply superimposed on the potential-induced elongation, so that the strain per electric charge is invariant with the load. The observations so far are consistent with the expectation for surface-stress driven actuation in a linear elastic materials system. Surprisingly, however, actuation in the regime of oxygen electrosorption responds strongly to loading: as the load is increased, the strain per charge gradually drops to zero and even inverts its direction. In other words, the actuator moves backward when asked to do work against a substantial external load. Furthermore, we demonstrate that the length change in response to lifting the oxygen adsorbate layer depends on the load that was present at the instant of oxysorption. This "load memory effect" has analogies to shape-memory behavior in massive alloys. Yet, contrary to shape-memory alloys, the microscopic origin is here a surface phase transition. We argue that the observation is a signature of the reorientation of local surface domains with anisotropic surface stress, and that the required atomic transport process acts only while mobile adatoms are supplied during the deposition or lifting of the oxygen adsorbate layer. |
| 资助者 | German Research Foundation (DFG) |
| DOI | 10.1103/PhysRevMaterials.3.066001 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | German Research Foundation (DFG)[We1424/16-1] |
| WOS研究方向 | Materials Science |
| WOS类目 | Materials Science, Multidisciplinary |
| WOS记录号 | WOS:000473315300006 |
| 出版者 | AMER PHYSICAL SOC |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.imr.ac.cn/handle/321006/134270 |
| 专题 | 中国科学院金属研究所 |
| 通讯作者 | Liu, Ling-Zhi |
| 作者单位 | 1.Helmholtz Zentrum Geesthacht, Inst Mat Res Mat Mech, D-21502 Geesthacht, Germany 2.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China 3.Hamburg Univ Technol, Inst Mat Phys & Technol, D-21073 Hamburg, Germany |
| 推荐引用方式 GB/T 7714 | Liu, Ling-Zhi,Mameka, Nadiia,Markmann, Juergen,et al. Surface-driven actuation: Sign reversal under load and surface load-memory effect[J]. PHYSICAL REVIEW MATERIALS,2019,3(6):7. |
| APA | Liu, Ling-Zhi,Mameka, Nadiia,Markmann, Juergen,Jin, Hai-Jun,&Weissmueller, Joerg.(2019).Surface-driven actuation: Sign reversal under load and surface load-memory effect.PHYSICAL REVIEW MATERIALS,3(6),7. |
| MLA | Liu, Ling-Zhi,et al."Surface-driven actuation: Sign reversal under load and surface load-memory effect".PHYSICAL REVIEW MATERIALS 3.6(2019):7. |
| 条目包含的文件 | 条目无相关文件。 | |||||
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