Lipophilic magnetite nanoparticles coated with stearic acid: A potential agent for friction and wear reduction

Author(s)

Zuin, Andre ; Cousseau, Tiago ; Sinatora, Amilton ; Toma, Sergio Hiroshi ; Araki, Koiti ; Toma, Henrique Eisi

• Document type: Journal article
• Source: TRIBOLOGY INTERNATIONAL; v. 112, p. 10-19, AUG 2017.
• Web of Science Citations: 8

Abstract

Lipophilic magnetite nanoparticles (MagNP; d approximate to 10 nm) functionalized with stearic acid were synthetized and tested as additive in polyalphaolefin synthetic base oil (PAO8) in a model system. The thermal properties of the starting base oil and of the base oil mixed with nanoparticles were evaluated using TG/DTA under inert and oxidizing atmosphere. The frictional response of the lubricants was evaluated under a broad range of operating conditions at the boundary lubrication regime using a 10 mm AISI 52,100 bearing steel ball against the flat face of an AISI H13 steel disc. The results showed that: i) MagNP improved the thermal stability of the base oil; ii) reduced the friction values, mostly during load step transition; iii) reduced significantly the wear marks. (AU)

• FAPESP's process: 13/19145-9 - Effect of addition of magnetite nanoparticles on the friction and wear in lubricated tests that simulate the system ring-cylinder in flex-fuel type engine
• Grantee: Andre Zuin
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 09/54891-8 - Tribological challenges in flex-fuel engines
• Grantee: Roberto Martins de Souza
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Research Partnership for Technological Innovation (PITE)