In recent work Corry examined water and ion transport through CNT-based membranes. This work aimed to investigate whether larger diameter (1.1 nm) NTs could be made to reject ions by attaching various charged and polar functional groups to the NT ends. Although the addition of charges is shown to prevent the passage of ions, it also reduces the flow of water through the membrane. Despite this the performance of these membranes was shown to be many times better than existing desalination membranes.