High-Tc Superconducting Membrane: (II) Nanosized Superconducting Particles into ¥á-Alumina Support

[摘要] Porous superconducting membranes were realized by the electrophoretic deposition of bismuth cuprate colloid precursors. In order to prepare superconducting colloidal suspension, the high T_c bismuth cuprate superconductor, Bi₂Sr₂CaCu₂O_8+y or Bi₂Sr₂Ca₂Cu₃O_10+y, should first be intercalated with mercury iodide molecules and subsequently with organic compounds such as pyridine and alkylpyridinium to induce interlayer complexes like bis(alkylpyridinium)tetraiodomercury and bis(Py)diiodomercury. Finally, the resulting organic complex intercalates were dispersed in an organic solvent to form superconducting colloids with an average particle size of ~200 nm. Gas separation membranes were prepared by the filtration of superconducting nano particles through an �?-alumina support. Their physical properties such as superconductance, porosity and pore size were measured by SQUID and mercury porosimetry, respectively, and their morphology and thickness were checked by SEM. The gas permeation experiments for nitrogen and oxygen mixture were performed at liquid nitrogen temperature.

[学科分类] 化学（综合）

[关键词] Gas separation;Superconducting membrane;Superconducting colloid.