1. College of Materials Science and Engineering Zhejiang University of Technology Hangzhou 310014 China
2. Environmental Process Modelling Centre Nanyang Environment and Water Research Institute Nanyang Technological University 1 Cleantech Loop Singapore 637141 Singapore
3. College of Environment Zhejiang University of Technology Hangzhou 310014 China
4. Singapore Centre for 3D Printing School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore