Acquisition of an Electron Energy Imaging Filter for the Electron Microbeam Analysis Laboratory (EMAL)

9704175 Martin该合同支持为密歇根大学电子微束分析实验室(EMAL)的JEOL 4000 EX高分辨率透射电子显微镜采购Gatan成像滤光片(GIF)配件。GIF由一个弯曲的磁扇形透镜组成，它充当棱镜的作用，将传输的电子束作为能量的函数分散。然后，可以对分散的光束进行滤波，以根据电子能量损失谱的选定部分创建图像或衍射图案。这一仪器将大大提高Emal电子光学仪器的微观分析能力。GIF目前尚未提供的其他功能包括：(1)低原子序数元素的高分辨率元素和电子状态图，(2)改善了衬底上聚合物和有机薄膜的对比度，(3)通过消除非弹性散射辐射改进了电子衍射分析，以及(4)改善了会聚束电子衍射图案的对比度。我们实验室正在进行的研究将直接受益于这项收购，包括构建和表征光电活性有序聚合物的晶界缺陷；热活性苯环丁烯功能化聚合物的合成、加工和表征；用于神经假肢的微机械硅传感器的生物兼容性基因工程多肽的加工和微观结构；以及聚合物和聚合物复合材料表面附近的微观结构。该仪器还将为材料科学和工程系、化学工程系、核工程系和放射科学系的其他研究项目提供有用的能力，详情见提案正文。GIF将增强Emal的电子光学设施，直接影响使用这些仪器的学生、教职员工和教职员工的研究机会。它也将作为材料微观结构研究生和本科生课程(MSE 460、MSE 560和MSE 662)实验室课程的一部分在课程中使用。GIF还将用于通过密歇根大学继续工程教育计划提供的夏季聚合物显微镜短期课程。***

9704175 Martin This award provides support for the acquisition of a Gatan Imaging Filter (GIF) accessory for the JEOL 4000 EX High Resolution Transmission Electron Microscope (HREM) located in the University of Michigan Electron Microbeam Analysis Laboratory (EMAL). The GIF consists of a curved magnetic sector lens that acts as a prism to disperse the transmitted electron beam as a function of energy. The dispersed beam can then be filtered to create images or diffraction patterns from selected portions of the electron energy loss spectra. This instrument would significantly enhance the microanalytical capabilities of the electron optics instrumentation at EMAL. Additional functionality provided by the GIF which is not presently available includes: (1) high resolution elemental and electronic state mapping of low atomic number elements, (2) improved contrast of polymer and organic thin films on substrates, (3) improved electron diffraction analysis by removal of inelastically scattered radiation, and (4) improved contrast in convergent beam electron diffraction patterns. Research underway in our laboratory which wi11 directly benefit from this acquisition includes the construction and characterization of grain boundary defects in optoelectronically active ordered polymers; the synthesis, and processing and characterization of thermally reactive benzocyclobutene functionalized polymers; the processing and microstructure of genetically engineered polypeptides for biocompatibility of micromachined silicon sensors for neural prosthetics, and the microstructure of polymers and polymer composites near surfaces. The instrument will also provide useful capabilities for other research projects in Materials Science and Engineering, Chemical Engineering, and Nuclear Engineering and Radiological Sciences departments, as detailed in the text of the proposal. %%% The GIF will provide an enhancement of the electron optics facility at EMAL, directly influencing the re search opportunities available for students, staff, and faculty who use these instruments. It will also be used in the curriculum as part of the laboratory sessions for graduate and undergraduate courses in Microstructure of Materials (MSE 460, MSE 560, and MSE 662). The GIF will also be used in summer short courses on Polymer Microscopy offered through the University of Michigan Continuing Engineering Education program. ***