METHOD FOR PRODUCING NUCLEAR-POROUS MEMBRANS EXPEDIENTLY MEMBRANE-FILTERS

摘要

Nucleoporous membranes primarily for filtration purposes are made from a particle sensitive trace detector polymeric films of 8-20 micron thickness by irradiation with low energy (5-10 MeV) and low charge (pref. Helium nuclei) ionic bundles. Symmetric or assymetric pores are obtd. by alkaline etching of irradiated films, on one or both sides. Symmetric pore structure is formed by particles passing through membranes. An assymetric pore structure is the result of absorbed (arrested) particles being followed by etching both sides. Etching conditions determine pore dimensions.