Yolk-Shell Nanocrystal from ZIF-8 (image) Boston College Share Print E-Mail Caption Boston College researches started with a metallic crystal. It was then coated with a "sacrificial layer" of copper oxide. The application of ZIF-8 formed a porous skin that then etched away the copper. Within the resulting cavity, researchers were able to control the chemical reaction thanks to the skin-like shell of ZIF-8. Credit Journal of the American Chemical Society Usage Restrictions None 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.