Branched polyethyleneimine modified carbon nanoparticles as the effective additives of water lubrication. Issue 12 (2nd December 2019)

• Record Type: Journal Article
• Authors: Mou, Zihao; Wang, Baogang; Huang, Zhiyu
• Is Part Of: Fullerenes, nanotubes and carbon nanostructures. Volume 27:Issue 12(2019)
• Page Start: 899
• Page End: 906
• Publication Date: 2019-12-02
• Subjects: Carbon nanoparticle -- polyethyleneimine -- lubricant additives -- friction -- wear; Fullerenes -- Periodicals; Nanotubes -- Periodicals; Nanostructures -- Periodicals; 546.6812
• DOI: 10.1080/1536383X.2019.1659246
• Languages: English
• ISSNs: 1536-383X

Abstract

Abstract: Branched polyethyleneimine (PEI) modified carbon nanoparticles (CNPs-PEI) with an average particle size of 20.1 nm were facile synthesized by hydrothermal treatment of citric acid and PEI. The PEI and oxygen-containing groups on CNPs-PEI endowed them with excellent dispersion stability in water. The tribological properties of CNPs-PEI as the water-based additives were evaluated under the four-ball mode, steel/steel contact and fixed load of 40 N by varying additive concentration. Amazingly, adding only 0.15 wt% of CNPs-PEI made the mean friction coefficient and wear volume of base liquid reduced by 53.4% and 94.9%, respectively, reflecting that the CNPs-PEI could be an effective additive of water lubrication. The wear scar surface analyses indicated that CNPs-PEI as additives promoted the formation of boundary lubrication films on the rubbing surfaces by mending and depositing effects, directly accounting for the distinguished friction-reducing, antiwear and oxidation resistance properties of CNPs-PEI.