NIRT: Nanoscale Shape Memory Actuators and Swimming Bugs - Theory, Computing, and MBE Synthesis

NIRT：纳米级形状记忆执行器和游泳虫 - 理论、计算和 MBE 合成

• 批准号: 0304326
• 负责人: Mitchell Luskin
• 金额: $ 119万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-15 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0304326&HistoricalAwards=false
• 关键词: NIRT; Nanoscale; Shape; Memory; Actuators

Proposal: DMS-0304326PI: Mitchell Luskin [[e-mail]]Institution: University of Minnesota - Twin CitiesTitle: NIRT: Nanoscale Shape Memory Actuators and Swimming Bugs - Theory, Computing, and MBE SynthesisABSTRACTThe investigators will undertake a program of research on the development of shape memory and emerging ferromagnetic shape memory materials for the production of motion at small scales. These materials spontaneously undergo a martensitic (diffusionless, structural) phase transformation with a change of shape. In the ferromagnetic shape memory materials, the shape change can be triggered by a remotely applied magnetic field. Because of their exceptionally high work output per unit volume, and the unusually large shape changes that are predicted to be possible in single crystal thin films, these materials are good candidates for nanoscale motors. The investigators will develop theoretical models and computational predictions for nanoscale motors that move, place, orient, actuate, and propel. A program of molecular beam epitaxial growth of NiTi films will be initiated, and the predicted designs will be put into practice on single crystal thin films of NiTi and Ni2MnGa. The research includes a fundamental theoretical/ computational/ experimental study of the behavior of phase transformation and the shape memory effect at small scales, resting on the study of the martensitic phase transformation in a sequence of specimens of smaller and smaller size. Emerging multiscale mathematical methods, expanded to atomic scale, will play a key role in guiding nanoactuator design.The production of well defined movements of objects at the nanoscale is a critical component of the emerging field of nanotechnology. This underlies the development of nanorobots, plays a crucial role in optical devices and the placement and orientation of sensors, and is an enabling component of devices that foster the interaction between the physical world and the fundamental processes of biology. The production of well defined motions and forces at small scales is particularly hampered by the dominance of interfacial and viscous forces at these scales and the destabilizing effects of random Brownian motions. The shape memory materials proposed by the investigators for use at these scales promise to overcome these impediments to well defined small-scale motion. As an underlying technology for several emerging fields, the research directly supports US strategic goals in materials science, nanotechnology, and national security.

提案：DMS-0304326PI: Mitchell Luskin [[e-mail]]机构：明尼苏达大学-双子城；标题：NIRT：纳米尺度形状记忆驱动器和游泳虫-理论，计算和MBE合成摘要研究人员将开展一项关于形状记忆和用于小尺度运动生产的新兴铁磁形状记忆材料开发的研究计划。随着形状的改变，这些材料自发地经历马氏体（无扩散的结构）相变。在铁磁形状记忆材料中，可以通过远程施加磁场来触发形状变化。由于其单位体积的高输出功，以及预计单晶薄膜中可能出现的异常大的形状变化，这些材料是纳米级电机的良好候选材料。研究人员将开发纳米级电机的理论模型和计算预测，用于移动、放置、定向、驱动和推进。将启动NiTi薄膜的分子束外延生长计划，并将预测的设计应用于NiTi和Ni2MnGa单晶薄膜上。本研究以马氏体相变在一系列尺寸越来越小的试样中的研究为基础，包括对小尺度相变行为和形状记忆效应的基础理论/计算/实验研究。新兴的多尺度数学方法，扩展到原子尺度，将在指导纳米致动器设计中发挥关键作用。在纳米尺度上产生物体的明确运动是新兴的纳米技术领域的关键组成部分。这是纳米机器人发展的基础，在光学设备和传感器的放置和方向中起着至关重要的作用，并且是促进物理世界和生物基本过程之间相互作用的设备的使能组件。在这些尺度上，界面力和粘性力的主导地位以及随机布朗运动的不稳定效应尤其阻碍了在小尺度上定义良好的运动和力的产生。研究人员提出的用于这些尺度的形状记忆材料有望克服这些障碍，实现良好定义的小尺度运动。作为几个新兴领域的基础技术，这项研究直接支持了美国在材料科学、纳米技术和国家安全方面的战略目标。