Adhesion between atomically flat metallic surfaces.
Adhesion between atomically flat metallic surfaces.
复制标题
原子级平坦金属表面之间的粘合力。
DOI：
--
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Dodson
中科院分区：
文献类型：
--
作者：
Taylor;Nelson;Dodson
对紧密接近的原子平坦表面之间的粘合相互作用的研究要求将它们的分离控制在十分之一埃以内。然而，在某些情况下，当两种固体的分离接近体积值时，它们的表面层将表现出结构不稳定性。当这种情况发生时，当表面达到其平衡体积分离的 1--2 A 以内时，就会发生从具有两个空间不同表面的几何形状到单个均匀结构的突然转变，称为“粘合剂雪崩”。雪崩事件是由于每个表面的间距减小到临界值时粘附力梯度临界增长的结果。我们应用嵌入原子方法来检查 (001) 和 (111) 取向的 Ni、Cu 和 Au 表面的这种现象。考虑了粘附的静力学和动力学，揭示了雪崩时产生拉应力波，并最终由于色散和耗散的影响而衰减为热量。这些张力波与由雪崩事件的发生引起的粘合力的波状传输相关。雪崩事件的存在将给界面力实验研究的解释带来困难。更多» 更少
The study of adhesive interactions between atomically flat surfaces in close proximity requires that their separation be controlled and known to within a tenth of an angstrom. In some instances, however, two solids will display a structural instability of their surface layers as their separation approaches the bulk value. When this occurs, an abrupt transition, termed adhesive avalanche,' from a geometry with two spatially distinct surfaces to a single homogeneous structure takes place as the surfaces are brought to within 1--2 A of their equilibrium bulk separation. The avalanche event is the result of a critical growth in the adhesive force gradient at each surface as their separation is reduced to a critical value. We have applied the embedded-atom method to examine this phenomenon for (001)- and (111)-oriented Ni, Cu, and Au surfaces. Both statics and dynamics of adhesion are considered, revealing that tensile stress waves are generated upon avalanche and eventually decay into heat due to the effects of dispersion and dissipation. These tensile waves are associated with a wavelike transmission of the adhesive force, caused by the occurrence of the avalanche event. The presence of avalanche events will cause difficulties in the interpretation of experimental studies of interfacialmore » forces.« less