Mechanical Properties of Nanotubes: Elastic Moduli, Buckling and a Nanometer-Scale Switch

9700677 Superfining这个项目将对纳米管进行合成、表征和建模，以了解它们与纳米级机械设备相关的机械性能以及作为复合材料的组成部分。弹性模数将使用原子力显微镜进行测量，以确定应力/应变关系。将通过确定的模数中的结构特征和不连续性的关联来特别注意管子的失效模式。这些研究将在碳和取代纳米管、填充管上进行，并将与分子动力学计算进行比较。原子分子动力学模拟将被用来提供对驱动纳米管机械性能的力的原子尺度的洞察。该项目将从最简单的MEMS结构--悬臂开关开始，将纳米管整合到机械设备结构中。这将作为界面效应的试验台，界面效应将在纳米级结构的运行中发挥关键作用。纳米管的表征和原型设备的生产都将通过AFM的独特、先进的接口--纳米操纵器--实现，该接口允许在测量施加在物体上的法向力和侧向力的同时进行方便的操作。***

9700677 Superfine This project will synthesize, characterize and model nanotubes to understand their mechanical properties as they relate to nanometer scale mechanical devices and as components of composite materials. The elastic moduli will be measured using Atomic Force Microscopy to determine stress/strain relationships. Particular attention will be paid to the failure modes of the tubes through the correlation of structural features and discontinuities in the determined moduli. These studies will be performed on carbon and substituted nanotubes, filled tubes, and will be compared with molecular dynamics calculations. The atomistic molecular dynamics simulations will be used to provide atomic scale insight into the forces which drive nanotube mechanical performance. The project will begin the incorporation of nanotubes into mechanical device structures beginning with the simplest MEMS structure, a cantilever switch. This will serve as a test bed for the interfacial effects which will play a critical role in the operation of a nanometer scale structure. Both the characterization of the nanotubes and the production of prototype devices will be made possible by a unique, advanced interface for AFM, the nanoManipulator, which permits facile manipulation while measuring the normal and lateral forces exerted on the object. ***