Abstract
In this review, the production method of commercial IEMs and research stage IEMs prepared using various production methods as well as their membrane structure were introduced. Novel IEMs using an ion track graft polymerization method with high performance were also introduced. Moreover, the principle of ionic transport through a mosaic charged（CM）membrane was explained. Because the cation-exchange and anion-exchange domains of a CM membrane are alternately arranged and these charged domains are passed through the membrane, the membrane shows high electrolyte permselectivity. Here, we have also introduced the preparation methods and the structure of a novel CM membrane prepared using the ion track graft polymerization method. In a piezodialysis system consisting of the CM membrane and two NaCl solutions of 500 ppm, the concentration at the high pressure side increased while that at the low pressure side decreased, indicating that the CM membrane has potential application to desalination of salt solutions with low salt concentrations.
