IMAGE (IMAGE) Kyoto University Caption The metal oxide clusters obtained in this study are positively (+) charged unlike conventional negatively (-) charged ones. Its surface protons are highly acidic, which is important in catalysis. Credit Mindy Takamiya/Kyoto University iCeMS Usage Restrictions Credit must be given to the creator. License CC BY 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.