Clathrates Artistic (IMAGE) Northwestern University Caption These are the gold nanoparticle bipyramids assembled into a complex crystal structure, known in chemistry as a clathrate. Credit Credit: Glotzer Group, University of Michigan. Copyright: Science Usage Restrictions Usage restrictions: Credit must be given 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.