MRI: Acquisition of a Scanning Transmission Electron Microscope for Research in Northern New England

该项目由主要研究仪器（MRI）和刺激竞争性研究的既定计划（EPSCoR）共同资助。非技术描述：该主要研究仪器奖支持购买先进的扫描透射电子显微镜（STEM），该显微镜位于达特茅斯学院电子显微镜设施内的专用实验室内。虽然位于达特茅斯，STEM服务于北方新英格兰的区域研究和教学机会，包括在新罕布什尔州，佛蒙特大学和缅因州奥罗诺大学，在那里它是同类中唯一的显微镜。远程监控和操作功能方便了非现场用户的访问，包括主要本科院校（PUI）全州网络中的课程和项目。STEM支持本科生、研究生和博士后研究员的教学和研究培训，并通过达特茅斯和新罕布什尔州大学的项目，以及通过全州范围的PUI IDEA生物医学研究卓越网络进行远程培训和外展，扩大妇女和代表性不足的群体在生物学、化学、工程学和材料科学方面的参与。许多研究项目旨在为社会带来直接效益，解决能源生产和储存、气体传感、先进材料和催化剂等关键需求。技术说明：收购的STEM拥有可在20 kV至200 kV范围内工作的高亮度场发射枪，并配备能量色散X射线光谱仪（EDS）。该显微镜使许多需要高分辨率成像和元素分析的项目成为可能，以及生物和光束敏感标本的断层扫描和低剂量成像。它使研究能够回答有关各种先进材料的结构，形成，性能和相互作用的基本问题，如高熵合金，金属间化合物，多孔有机材料，增量形成的金属片，tau-MnAl和NiFe永磁体，质子交换膜电池，用于辐射损伤检测的硅器件，SiGeSn合金，Na-S电池材料，纳米颗粒单独和嵌入多孔薄膜中，新型Li电池材料，纳米晶体合金和纳米层压材料，二维过渡金属二硫属化物，非氧化物陶瓷，该奖项反映了NSF的法定使命，并被认为是值得通过使用基金会的智力价值和更广泛的评估支持。影响审查标准。

This project is jointly funded by Major Research Instrumentation (MRI) and the Established Program to Stimulate Competitive Research (EPSCoR).Non-technical Description:This Major Research Instrumentation award supports the acquisition of an advanced scanning transmission electron microscope (STEM), which is housed in a purpose-built laboratory within the Electron Microscope Facility at Dartmouth College. While located at Dartmouth, the STEM serves regional research and teaching opportunities over Northern New England including at the University of New Hampshire, the University of Vermont, and the University of Maine-Orono, where it is the only microscope of its kind. The remote monitoring and operation capabilities facilitate access for off-site users, including for courses and projects in statewide networks of primarily undergraduate institutions (PUI). The STEM supports teaching and research training of undergraduates, graduate students, and post-doctoral fellows, and broadens the participation of women and under-represented groups in biology, chemistry, engineering, and materials science through programs at Dartmouth and the University of New Hampshire, and through remote training and outreach via statewide PUI IDeA Networks of Biomedical Research Excellence. Many of the research projects are designed to yield direct benefits to society, addressing critical needs including energy production and storage, gas-sensing, advanced materials, and catalysts.Technical Description:The acquired STEM has a high-brightness field emission gun capable of operating from 20 kV to 200 kV, and is equipped with an energy dispersive X-ray spectrometer (EDS). The microscope makes possible many projects requiring high-resolution imaging and elemental analysis, as well as tomography and low-dose imaging for biological and beam-sensitive specimens. It enables research to answer fundamental questions regarding the structure, formation, properties, and interactions of a wide range of advanced materials such as high-entropy alloys, intermetallic compounds, porous organic materials, incrementally-formed sheet metal, tau-MnAl and NiFe permanent magnets, proton-exchange membrane cells, silicon devices for radiation damage detection, SiGeSn alloys, Na-S battery materials, nanoparticles alone and embedded in porous thin films, novel Li battery materials, nanocrystalline alloys and nanolaminates, two-dimensional transition metal dichalcogenides, non-oxide ceramics, and biomolecular specimens and biomaterials.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.