Clathrates Artistic (image) Northwestern University Share Print E-Mail 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 Share Print E-Mail 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.