Nano Self-Assembly (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption This electron micrograph shows a self-assembled composite in which nanoparticles of lead sulfide have arranged themselves in a hexagonal grid. Credit Ting Xu, Lawrence Berkeley National Laboratory- UC Berkeley 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.