1 Centre for Additive Manufacturing, Faculty of Engineering, The University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom. qin.hu@nottingham.ac.uk.
2 School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom.
3 Nanoscale and Microscale Research Centre, The University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom.
4 Centre for Additive Manufacturing, Faculty of Engineering, The University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom.
5 Department of Chemical and Environmental Engineering, Faculty of Engineering, The University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom.
6 Centre for Additive Manufacturing, Faculty of Engineering, The University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom. ricky.wildman@nottingham.ac.uk.