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

该合同为位于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（HREM）的Gatan成像滤光片（GIF）配件的采购提供支持。GIF由一个弯曲的磁性扇形透镜组成，该透镜充当棱镜，以能量的函数分散传输的电子束。然后可以对分散的光束进行过滤，从电子能量损失谱的选定部分产生图像或衍射图案。该仪器将大大提高EMAL电子光学仪器的微观分析能力。GIF提供的其他功能目前还没有实现，包括：(1)低原子序数元素的高分辨率元素和电子状态映射，(2)提高了聚合物和有机薄膜在衬底上的对比度，(3)通过去除非弹性散射辐射改善了电子衍射分析，(4)提高了会聚束电子衍射模式的对比度。我们实验室正在进行的研究将直接受益于此次收购，包括光电活性有序聚合物中晶界缺陷的构建和表征；热反应性苯并环丁烯功能化聚合物的合成、加工与表征神经义肢微机械硅传感器生物相容性的基因工程多肽的加工和微观结构，聚合物和聚合物复合材料近表面的微观结构。该仪器还将为材料科学与工程、化学工程、核工程和放射科学系的其他研究项目提供有用的能力，详见提案文本。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，教职员工的研究机会。它也将作为研究生和本科生材料微观结构课程（MSE 460， MSE 560和MSE 662）的实验课程的一部分使用。GIF还将用于密歇根大学继续工程教育项目提供的暑期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. ***