Synergistic Lubrication and Antioxidation Efficacies of Graphene Oxide and Fullerenol as Biological Lubricant Additives for Artificial Joints

Abstract

The service life of artificial joints has gradually failed to meet the needs of patients. Herein, the synergistic lubrication and antioxidant efficacies of graphene oxide (GO) and fullerenol (Fol) as biological lubricant additives for artificial joints were investigated. The lubrication mechanisms of biological lubricant containing GO and Fol at the friction interface of artificial joints were then revealed. Tribological tests showed that the average friction coefficients of Al2O3–Ti6Al4V pairs and Ti6Al4V–UHMWPE pairs for artificial joints could be reduced by 30% and 22%, respectively, when GO and Fol were used as biological lubricant additives simultaneously. The lubrication mechanism showed that some incommensurate sliding contact surfaces could be formed between the GO nanosheets and spherical Fol at the interface, which reduced the interaction forces of friction pairs. The maximum scavenging rates of •OH and DPPH free radicals by the biological lubricant containing GO and Fol were 35% and 45%, respectively, showing a good antioxidant efficacy of the biological lubricant. This can be attributed to the GO and Fol scavenging free radicals through electron transfer and hydrogen transfer. This study provides a theoretical basis for the development and application of carbon nanomaterials as biological lubricant additives for artificial joints in the future.

A novel digitonin/graphene oxide/iron oxide nanocomposite: synthesis, physiochemical characterization and antioxidant activity

“…Furthermore, the results show that the DIG, GO, and Fe 3 O 4 MNPs synergistically interact in terms of their ability to free radicals scavenging. This phenomenon can be attributed to the tendency of spherical Fe 3 O 4 MNPs and lamellar GO to aggregate into significant clusters in aqueous solutions, thereby impeding their capability to effectively scavenge radicals [ 61 ]. When both DIG/GO/Fe 3 O 4 nanocomposite were instantaneously exist in an aqueous solution, the spherical Fe 3 O 4 MNPs might be successfully loaded onto the GO lamellae and intercalated to reduce agglomeration.…”

Tribological Behavior and Wear Protection Ability of Graphene Additives in Synthetic Hydrocarbon Base Stocks

“…In the past few decades, various new two-dimensional materials, including MXenes [6,7], MoS 2 [8,9], WS 2 [10], as well as graphene [11], have become a hot topic in the field of friction [12]. Among them, graphene has been widely considered by researchers due to its low surface energy and unique tribological properties [13][14][15] caused by easy-sliding multi-layer structures [16]. Omrani et al [17] modified graphene using oleic acid and found that 0.02 wt.% oleic acid-modified graphene could be well-dispersed in PAO9 and improve the friction-reducing and anti-wear properties effectively.…”