Airfl ow-Field-Induced Sandwich-Type Membrane of Block Copolymer for Selective Ion Separation

摘要

A simple and effective airfl ow method to prepare sandwich-type block copolymer fi lms is reported. The fi lms are composed of three layers: vertically oriented nanocylinders align in both upper and bottom layers and irregular nanocylinders exist in the bulk of the fi lm. The vertically oriented nanocylinders in both sides can provide high accessibility to ions and ensures the exchange of chemical species between the membrane and external environment, while the irregularly oriented nanocylinders in the middle part of the fi lm can prolong the pathway of ions transportation and enhance ions selectivity.