Nanoparticles Under Electron Microscope (IMAGE) University of Arizona College of Engineering Caption UA researcher and paper co-author Reyes Sierra used an electron microscope to acquire this image of silica nanoparticles. Credit Reyes Sierra 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.