Nanosponge TEM (image) University of California - San Diego Caption Transmission electron microscopy demonstrated that the nanosponges are approximately 85 nanometers in diameter. Credit Zhang Research Lab, UC San Diego Jacobs School of Engineering Usage Restrictions with credit. embargoed until April 14 at 1pm EST. 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.