Dr Zeng Zhiyuan and his research group (IMAGE) City University of Hong Kong Caption Dr Zeng Zhiyuan (front row, right) and his research group from the Department of Materials Science and Engineering at City University of Hong Kong. Credit City University of Hong Kong Usage Restrictions Image must be used with appropriate caption and credit. 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.