Nanoclusters (IMAGE) University of Iowa Caption Nanoparticles atom by atom: A Keggin-type nanocluster, visualized above, can adsorb toxic cations (positively charged ions) in the water. Credit Sara Mason group, University of Iowa 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.