Tribochemistry of Ionic Liquid Lubricant on Magnetic Media

Table 7

Heat of adsorption and desorption of the lubricants on the surface.

Structure and lubricant number	Dielectric constant**	Heat of adsorption/erg cm^−2	Heat of desorption/erg cm^−2
C7F15CO O C18H31 (2)	2.01	2.1	1.0
C7F15CO NH C18H31* (4)	2.36	2.7	1.9
C7F15 O^−H3N^+C18H31 (6)	2.66	18.9	Not detected

*Stearyl amide is slightly soluble in the solvent, therefore, the double bonded lubricants are used. **Dielectric constant is measured at 3 MHz.