I. Introduction to Magnetic Fluid Magnetic fluid can be summarized by many people as a substance with both magnetism and fluidity. In fact, it does have two characteristics: the fluidity of liquid and the magnetism of solid matter. People usually refer to magnetic fluid as ferrofluid or magnetic liquid. The biggest feature of magnetic fluid is that if it is at rest, it will generally show no magnetism at all. But if we add a magnetic field around the magnetic fluid at this time, it will show magnetic characteristics. Magnetic fluid will form a very special microstructure when it is in magnetic field for a long time. Its microstructure may have different effects on light. The transmittance and refractive index of sunlight can be changed to some extent.
Second, the preparation method of magnetic fluid Magnetic fluid is actually not a substance that exists in nature, but a substance that humans later prepared with science and technology. Up to now, there are four main preparation methods of magnetic fluid, namely, discharge method, thermal decomposition method, peptization method and grinding method. The so-called grinding method is to grind some magnetic materials, active agents and carrier liquid together, and finally grind them into particles, and then separate the large particles from these particles by centrifugation.
Third, the application of magnetic fluid Magnetic fluid is widely used in astrophysics, industry and controlled thermonuclear reactions. Among them, in the controllable thermonuclear reaction, magnetic fluid can help the human body get more ocean energy. Magnetic fluid is generally used as a sealing element in industry.