S-1 Supporting Information Combined tribological and bactericidal effect of nanodiamonds as potential lubricant for artificial joints Asghar Shirani a,# , Qichan Hu b,# , Yingchao Su c , Tasha Joy a , Donghui Zhu* ,c , Diana Berman* ,a a) Materials Science and Engineering, University of North Texas, Denton, TX 76203, USA b) Department of Biomedical Engineering, University of North Texas, Denton, TX 76203, USA c) Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY 11749, USA # Equal contribution *Corresponding Author: Donghui.Zhu@stonybrook.edu; Diana.Berman@unt.edu