SEM images of material samples (IMAGE) Rice University Caption Scanning electron microscopy images of the starting material (from left), the material resulting from the high-concentration phosphoric acid treatment and the purified boron nitride nanotubes. Credit (Image courtesy of the Martí group/Rice University) Usage Restrictions Must credit the Martí group/Rice University. License Original 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.