Recent progress on phosphonium-based room temperature ionic liquids: Synthesis, properties, tribological performances and applications

Phosphonium-based room temperature ionic liquids (P-RTILs) offer outstanding lubricant properties. Studies have shown that the cationic chain length and anionic ring size significantly affect the performance of P-RTIL lubricants by altering properties, such as viscosity, density, thermal stability, wettability, and solubility. Functionalized moieties further improve their performance. However, the presence of halide groups could introduce...