Ion liquid based magnetofluid preparation method

The invention relates to room temperature ionic liquid magnetic fluid materials and a preparation method thereof, belonging to the material and the preparation thereof technical field. The invention applies the chemical coprecipitation method to prepare the nanometer-level Fe3O4 particles of which the face treatment is conducted by using the betaine as the surface active agent, and then the particles are evenly dispersed in the room temperature ion liquid, in the end the room temperature ionic liquid magnetic fluid materials are made. During the preparing process, the oxygen does not need to be excluded; the made Fe3O4 particles are small in diameter, narrowly distributed and relatively strong in magnetic performance; moreover, the method also has the advantages of simple and convenient operation and low priced and easily accessible raw materials, and is easy to be widely used.