Ultrapurification of Superconducting Powders

在制备超导粉末（Tc = 110 K）时， Bi系、超导前驱体粉末（Tc = 80 K）具有与110相似的组成和物理性质 K阶段。 该项目的目标是分离 110 K相粉末在其显著部分之后， 形成了 考虑到没有显著差异 在物理性质（例如密度、电和 磁特性）的 80 K相和110 K相，基于 可以排除这些性质的差异。 在这 研究，双水相形成技术和选择性 将研究絮凝技术以分离110 K 从80K阶段。 110优先分馏 富聚合物（或水相）中的K（或80 K）相将 使用葡聚糖、纤维素和其他合成的 聚合物 通过选择性分离器分离两相， 絮凝技术也将涉及优先 给定颗粒相和聚合物之间的相互作用。 的 聚合物检查将包括，聚丙烯酰胺，聚丙烯酸 酸和聚环氧乙烷。 预计产生的基本知识库 在这项研究中，将用于处理 超导粉末，以及其他相关应用 材料生产和环境。

In the preparation of superconducting powder (Tc = 110 K) in the Bi-system, the precursor superconducting powder (Tc = 80 K) has similar composition and physical properties as the 110 K phase. The objective of this project is the separation of the 110 K phase powder after a significant fraction of it is formed. Considering that there is no significant difference in the physical properties (e.g. density, electrical and magnetic characteristics) of the 80 K phase and the 110 K phase, separation techniques based on differences in such properties can be ruled out. In this study, aqueous biphase formation technique and selective flocculation technology will be examined to separate the 110 K phase from the 80 K phase. Preferential fractionation of 110 K (or 80 K) phase in the polymer rich (or aqueous phase) will be achieved using dextran, cellulose and other synthetic polymers. Separation of the two phases by the selective flocculation technology would also involve preferential interaction between a given particle phase and polymer. The polymer examined would include, polyacrylamides, polyacrylic acid and polyethylene oxide. It is expected that the fundamental knowledge base generated in this study would be used in the processing of superconducting powders, as well as other applications related to materials production and environment.