Acquisition of an Electron Microscope (Materials Research)

透射电子显微镜用于研究 将获得复杂的流体和聚合物系统。 小说 冷冻断裂技术将直接检查 聚丙烯酰胺凝胶，聚丁二炔的棒-卷转变 溶液和表面活性剂-油-水微乳液 显微镜 快速冷冻这些系统可以保存 无伪影的显微结构。所述固化流体 断裂并覆盖着铂和碳层， 复制断裂面然后检查这些复制品 在电子显微镜下的分子分辨率。 的 复制品也可以用扫描隧道检查 显微镜评估三维轮廓与高 解决方案 单个聚合物链可以用 前所未有的分辨率和间隙分布 可以测量凝胶中的流体。 第一次，直接 外部扰动对凝胶影响的反馈 结构是可能的。 三维结构的中- 由等体积的油和水组成的范围微乳液 也可以用分子量法检查表面活性剂共增溶的 分辨率 导电聚合物的溶液浇铸膜 可以检查复合材料以确定 复合材料和导电部分的形态。 生物和其他非导电材料可以成像 同时扫描隧道和透射电子 显微镜

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.