Low viscosity, electrically conductive ferrofluid composition

摘要

A low viscosity, electrically conductive ferrofluid composition and method of making and using same, which composition comprises a polar liquid carrier, a polar liquid agent miscible in the polar carrier and comprising a polyol, such as a tetraethylene glycol dimethyl ether; magnetic particles to impart magnetic characteristics to the ferrofluid composition; and a surfactant, particularly a cationic surfactant in an amount sufficient to stabilize and disperse the magnetic particles, the surfactant dissociated or ionized predominately by the polar liquid agent.