title: Ionic Grease Lubricants: Protic [Triethanolamine][Oleic Acid] and Aprotic [Choline][Oleic Acid].
abstract: Ionic liquid lubricants or lubricant additives have been studied intensively over past decades. However, ionic grease serving as lubricant has rarely been investigated so far. In this work, novel protic [triethanolamine][oleic acid] and aprotic [choline][oleic acid] ionic greases are successfully synthesized. These ionic greases can be directly used as lubricants without adding thickeners or other additives. Their distinct thermal and rheological properties are investigated and are well-correlated to their tribological properties. It is revealed that aprotic ionic grease shows superior temperature- and pressure-tolerant lubrication properties over those of protic ionic grease. The lubrication mechanism is studied, and it reveals that strong physical adsorption of ionic grease onto friction surface plays a dominating role for promoted lubrication instead of tribo-chemical film formation.
authors.affiliation: Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering, The University of Akron , Akron, Ohio 44325 United States.
authors.forename: Liwen
authors.initials: L
authors.lastname: Mu
authors.affiliation: Division of Machine Elements, Luleå University of Technology , Luleå 97187, Sweden.
authors.forename: Yijun
authors.initials: Y
authors.lastname: Shi
authors.affiliation: Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering, The University of Akron , Akron, Ohio 44325 United States.
authors.forename: Tuo
authors.initials: T
authors.lastname: Ji
authors.affiliation: Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering, The University of Akron , Akron, Ohio 44325 United States.
authors.forename: Long
authors.initials: L
authors.lastname: Chen
authors.affiliation: Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering, The University of Akron , Akron, Ohio 44325 United States.|College of Chemistry and Chemical Engineering, Northeast Petroleum University , Daqing 163318, PR China.
authors.forename: Ruixia
authors.initials: R
authors.lastname: Yuan
authors.affiliation: College of Chemistry and Chemical Engineering, Northeast Petroleum University , Daqing 163318, PR China.
authors.forename: Huaiyuan
authors.initials: H
authors.lastname: Wang
authors.affiliation: Intelligent Composites Laboratory, Department of Chemical and Biomolecular Engineering, The University of Akron , Akron, Ohio 44325 United States.
authors.forename: Jiahua
authors.initials: J
authors.lastname: Zhu
keywords: friction; interface; ionic grease; lubrication; rheology