磁性液体是一种用表面活性剂 (如油酸等 )将强磁性超微粒子如氮化铁、四氧化三铁等均匀分散在非导电性液体(如水、酯、醚、煤油 )或导电性液态金属 (如铟锡镓合金和水银 )中形成一种稳定的胶体溶液 ;它既有流动性 ,又有强磁性 ,对磁场相当敏感 ,已在许多领域中得到了应用。例如 Magnetic fluid is a kind of surface active agent (such as oleic acid, etc.) ferromagnetic ultrafine particles such as iron nitride, ferroferric oxide, etc. are uniformly dispersed in a non-conductive liquid (such as water, ester, ether, kerosene) or conductive liquid Metal (such as indium gallium alloy and mercury) to form a stable colloidal solution; it is both fluid and ferromagnetic, very sensitive to the magnetic field, has been applied in many fields. E.g