Super paramagnetic fluids and methods of making super paramagnetic fluids

摘要

Super paramagnetic fluids having improved thermal and oxidative stability and processes for making super paramagnetic fluids having improved thermal and oxidative stability. The super paramagnetic fluids according to this invention comprise (a) a carrier liquid; (b) a dispersing agent com­prising a salt of an aromatic sulfonic acid which disperses coated magnetic particles in said carrier liquid; and (c) coated magnetic particles coated with at least one or­ganic acid which renders said magnetic particles hydrophobic, said organic acid being capable of peptizing said magnetic particles into a fugitive solvent, said fugitive solvent being a solvent for said dispersing agent.