Caps (2 of 2) (image) Rice University Caption More than a thousand end caps that make up this Rice University logo represent a fraction of those surveyed by Rice researchers who determined that the energies employed in cap formation do not contribute to the chirality of carbon nanotubes. Chirality refers to the angle of hexagons in nanotubes and dictates their electronic and other desirable properties. Credit Evgeni Penev/Rice University Usage Restrictions None 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.