Novel Ionic Lubricants for Magnetic Thin Film Media

New protic ionic liquids (PILs) have been developed. The kinetic friction coefficients of ammonium salts of the alcolate, the carboxylate, and the sulfonate were from 0.23, 0.17, and 0.15, respectively, and 0.26 for Fomblin Z-DOL. PILs have better friction and wear properties compared to Z-DOL. The ammonium salts as a hydrophilic group have a lower frictional coefficient, which enhanced the abrasion resistance. The friction and the thermal degradation decreases with the increasing between the Broensted acid and the Broensted amine. The material based on an ammonium sulfonate has higher , and does not decompose even at 300 , making it more thermally stable than Z-DOL.