Acquisition of High-Resolution Electron Microscopy Facilities for The Johns Hopkins University

9512438 Veblen这项学术研究基础设施赠款提供680,000美元，作为约翰·霍普金斯大学购买和安装新型场发射枪高分辨率电子显微镜(FEG-HRTEM)费用的一半支持。配套资金将通过凯克基金会提供。地球科学设施和仪器计划的ARI拨款和工程学的土木工程和机械系统的ARI拨款分别为57万美元和11万美元。约翰霍普金斯大学对HRTEM设施的需求超越了传统的系和分部界限，包括广泛的工程和科学学科。该显微镜将是一个跨部门/跨部门电子显微镜实验室的基石，该实验室将使霍普金斯大学在生物医学工程、化学工程、化学、地球和行星科学、环境工程、材料科学和工程、机械工程和物理领域的研究人员受益。具体地说，将获得并安装一台300keV原子分辨率的电子显微镜，该场发射枪能够在纳米级(0.2 nm)对材料进行点对点表征，并配备能够进行极高分辨率(~1 nm)化学分析的大电流探头。许多先进材料的发展和环境化学、地球化学和物理学基础认识的进步正在纳米甚至原子尺度上进行，这些领域的研究高度依赖于在这些长度尺度上观察和表征固体的能力。将在新的电子显微镜设备中进行的具体研究项目的例子有：纳米材料的加工和表征、金属间合金中的位错核结构、环境化学(解决有毒金属和其他污染物在土壤矿物上的吸附问题)、稀土磁致材料的开发和表征、多孔性半导体的纳米级观察、材料中失效机制的识别及其在制造过程中的应用，以及晶体化学和地球化学研究。***

9512438 Veblen This Academic Research Infrastructure grant provides $680,000 as one-half support of the costs of acquiring and installing a new high-resolution transmission electron microscope with a field emission gun (FEG-HRTEM) at The Johns Hopkins University. Matching funds will be provided through the Keck Foundation. Funding is split between the Earth Sciences Facilities and Instrumentation Program's ARI allocation and Engineering's Civil and Mechanical System's ARI allocation in amounts of $570,000 and $110,000, respectively. The need for HRTEM facilities at Johns Hopkins University extends beyond traditional departmental and divisional boundaries and includes a broad range of engineering and scientific disciplines. This microscope will be the keystone of an interdepartmental/interdivisional electron microscopy laboratory that will benefit Hopkins researchers in biomedical engineering, chemical engineering, chemistry, earth and planetary sciences, environmental engineering, materials science and engineering, mechanical engineering, and physics. Specifically, a 300 keV atomic resolution TEM with a field emission gun capable of point-to-point characterization of material at the nanoscale (0.2 nm) and equipped with a high current probe capable of extremely high resolution (~ 1 nm) chemical analyses will be acquired and installed. Development of many advanced materials and the advancement of fundamental understanding in environmental chemistry, geochemistry, and physics are occurring at nanometer or even atomic dimensions and research in these areas is highly dependent on the ability to observe and characterize solids at these length scales. Examples of specific research projects that will be conducted in the new electron microscopy facility are processing and characterization of nanoscale materials, dislocation core structures in intermetallic alloys, environmental chemistry (addressing sorption of toxic metals and other pollutants on soil minerals), development and characterization of rare-earth magnetostictive materials, nanoscale observations of porous semiconductors, the identification of failure mechanisms in materials with applications to manufacturing processes, and investigations in crystal chemistry and geochemistry. ***