膜の構造制御と機能 相転換法による膜構造制御

Abstract

The control of 3-dimensions membrane structure is of primary concern in the development of new separation membranes. Here, a new possibility for separation membrane is presented using a phase inversion process. The structure of the asymmetric membrane fabricated by a dry/wet phase inversion process showed an ultrathin skin layer and sponge-like structure characterized by the presence of macrovoids. We have prepared a series of asymmetric membranes with different defect-free skin layer thicknesses from 10 to 5.0×103nm by the dry/wet phase inversion.The gas selectivity of the asymmetric membrane increases with a decrease in the surface skin layer thickness, which may be due to the fact that the surface skin layer of the membrane with a thinner thickness forms a more packed structure. On the other hand, porous membranes with nanoscale pore sizes are of interest in areas such as catalysis, sensors, size-and shape-selective separation media, adsorbents, and scaffolds for composite materials synthesis.Those with pore sizes on the order of 1nm to 10μm are required. A new possibility for porous membrane is presented using a phase inversion process.