Clean (2 of 3) (IMAGE) Rice University Caption Multiwalled nanotubes before treatment with a Rice University/Swansea University process to remove catalyst residue from their surfaces and from inside. The process begins with heating the nanotubes in a standard kitchen microwave oven. Credit Virginia Goméz Jiménez/Swansea 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.