Chuan Li is a Lecturer in the School of Chemistry and Material Engineering at Chaohu University, China. He received his PhD degree in 2019, from the Hefei University of Technology, China, under the supervision of Professor Xianguo Hu. His research interests deal with green tribology, friction-pair materials, and lubricating additives.Xianguo Hu is a Professor and Vice-Director of the Institute of Tribology, at the Hefei University of Technology, China. His research focuses on lubricants and tribochemistry, friction and wear of material, tribology in metal working, and surface coating. He is the author or co-author of more than 160 peer-reviewed papers.