Friction and anti-wear properties of two tris(pentafluoroethyl)trifluorophosphate ionic liquids as neat lubricants

Effectiveness of phosphonium cation-based ionic liquids as lubricant additive

“…Early works dealt with ILs with the imidazolium cation and fluorine-containing anions [12][13][14][15][16], but these anions tend to produce toxic and corrosion products in the presence of water [17]. The good lubricating properties of ILs are related to its polarity [18] and reactivity provoking the formation of adsorbed tribofilms on the metal surfaces and contributing to friction and wear reduction [19][20][21].…”

Phosphonium cation-based ionic liquids as neat lubricants: Physicochemical and tribological performance

“…These facts contribute to the friction and wear reduction properties of ILs [22]. Regarding the use of ILs as neat lubricants, several studies have shown great potential for this purpose [16,20,[23][24][25][26][27][28].…”

“…They have been tested for several applications such as extraction solvents, chemical synthesis solvents, electrolytes in batteries and super-capacitors, and in corrosion protection [32]. From a tribological point of view, some ILs of this family have been tested as neat lubricants reporting better tribological performance than imidazolium counterparts [33][34][35] and conventional oils [22,[36][37]. Table 1 summarizes the main works developed with phosphonium cation-based ionic liquids in tribology.…”

On the viscosity of two 1-butyl-1-methylpyrrolidinium ionic liquids: Effect of the temperature and pressure

“…They can be employed for applications involving extreme operating conditions on account of their high temperature stability and low vapor pressure [6]. Due to its high thermal conductivity, ILs dissipate heat more effectively during sliding [6,7], and can also reduce some non-desirable effects like abrasion [8,9]. However, one of the most important characteristic of ILs is their ability to be tuned, which arises from the large number of possible anion−cation pairs.…”