Polymeric Molecular Sieve Membranes (IMAGE) University of Cambridge Caption Image shows fluorescence of solution (left) and membrane (right) made of a polymer of intrinsic microporosity (PIM-1) under irradiation of ultraviolet (UV) light. The ultraviolet irradiation induces oxidation and surface densification of the polymeric molecular sieve membranes. Credit Nature Publishing Group Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.