Heavy Metal (3 of 3) (IMAGE) Rice University Caption An electron microscope image shows quartz fibers with carbon nanotubes after epoxidation. Experiments showed epoxidation appears to give the filters their absorptive quality. Credit Barron Research Group/Rice University 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.