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Acquisition of an Electron Microscope (Materials Research)

购买电子显微镜（材料研究）

基本信息

批准号：
8719771
负责人：
Joseph Zasadzinski
金额：
$ 7.5万
依托单位：
University of California-Santa Barbara
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1987
资助国家：
美国
起止时间：
1987-12-15 至 1989-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8719771&HistoricalAwards=false
关键词：
Acquisition Electron Microscope Materials Research

项目摘要

A transmission electron microscope for use in investigations of complex fluid and polymer systems will be acquired. Novel freeze-fracture techniques used will directly examine polyacrylamide gels, rod-coil transitions of polydiacetylene solutions, and surfactant-oil-water microemulsions using electron microscopy. Rapid freezing of these systems can preserve the microstructure without artifact. The solidified fluid is fractured and coated with layers of platinum and carbon to replicate the fracture surfaces. These replicas are then examined in the electron microscope with molecular resolution. The replicas can also be examined with the scanning tunneling microscope to assess three dimensional contours with high resolu1tion. Individual polymer chains can be visualized with unprecedented resolution and the distribution of interstitial fluid in gels can be measured. For the first time, direct feedback about the influence of external perturbations on the gel structure is possible. The three dimensional structure of mid- range microemulsions consisting of equal volumes of oil and water cosolubilized by surfactant can also be examined with molecular resolution. Solution cast films of conducting polymer composites can be examined to determine the nature of the composite and the morphology of the conducting fraction. Biological and other non-conducting materials can be imaged simultaneously with scanning tunneling and transmission electron microscopy.

将获得用于研究复杂流体和聚合物体系的透射电子显微镜。使用的新型冷冻-断裂技术将直接使用电子显微镜检查聚丙烯酰胺凝胶、聚二乙炔溶液的棒-线圈转变以及表面活性剂-油-水微乳液。这些体系的快速冷冻可以在没有伪影的情况下保存微结构。凝固的流体被压裂，并涂上一层铂和碳层，以复制断口表面。这些复制品随后在电子显微镜下以分子分辨率进行检查。复制品还可以用扫描隧道显微镜进行检查，以获得高分辨率的三维轮廓。单个聚合物链可以以前所未有的分辨率可视化，并且可以测量凝胶中间质流体的分布。第一次，关于外部扰动对凝胶结构的影响的直接反馈成为可能。由表面活性剂增溶的等体积油和水组成的中端微乳液的三维结构也可以用分子分辨率来研究。可以对导电聚合物复合材料的溶液浇铸膜进行检查，以确定复合材料的性质和导电部分的形态。利用扫描隧道和透射电子显微镜可以同时对生物和其他非导电材料成像。