Nanographene Structures (IMAGE) Technische Universität Dresden Caption Mechanical energy provided by the collision of milling ball in planetary ball mills allows to synthesize nanographene structures under environmentally friendly and solvent-free reaction conditions. Credit Sven Grätz 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.