Carbon (2 of 3) (IMAGE) Rice University Caption Polyethyleneimine (PEI) with carbon-60 atoms, aka buckminsterfullerenes, form a spongy brown compound that absorbs a fifth of its weight in carbon dioxide but no measurable amount of methane. That may make it suitable for capturing carbon dioxide at wellheads and from industrial flue gases. 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.