'Eggshell-and-yolk' Nanostructures (IMAGE) American Chemical Society Caption “Eggshell-and-yolk” Nanostructures Credit Courtesy of Bing Xu 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.