projectiles (IMAGE) Vienna University of Technology Caption The model developed at TU Wien explains why tiny holes - only a few nanometers in size - are formed in some two-dimensional materials when they are bombarded with highly charged ions, but not in others. The effect of nano-hole formation can be exploited to produce novel sieves for certain molecules. Credit TU Wien Usage Restrictions none License Original 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.