1.What is a nano magnetic material
Nanomaterial refers to a new material whose composition is nanometer-sized grains and atoms arranged in a certain model, and its grain size is between 1nm and 100nm. Magnetic nanomaterials refer to magnetic materials that reach the nanometer level.
According to the dimensions, there are super one-dimensional nano powder, one-dimensional nano film, two-dimensional nano fiber and three-dimensional nano-block magnetic material. The characteristics of nanometer magnetic materials are greatly different from those of conventional magnetic materials, because nanometer materials have completely different magnetic physical properties. Using these different superior performance, many new materials can be made.
2. Characteristics of nanomaterials
The characteristics of nanomaterials are different from traditional nanomaterials. In addition to the above reasons, the basic composition of the material, such as the magnitude of the crystal grains, the arrangement structure of the crystal grains, the surface energy level, and the bond energy, is completely different from conventional materials. Magnetic nanomaterials are important components of nanomaterials, so they have the same characteristics as many nanomaterials, such as quantum size effect, small size effect, and macro quantum tunneling effect.
3.Classification of nano-magnetic materials
In the constantly developing market environment of new materials, nano-magnetic materials have also been continuously developed and updated, and are used in all aspects of life. Nano-magnetic materials in the current market can be divided into the following categories according to material properties: magnetic nano-microcrystalline materials, nano-magnetic particulate materials, nano-magnetic ordered arrays, nano-magnetic structural materials, and the like.
4. The future development trend of nano magnetic materials in the Chinese market
1) Nano permanent magnetic material
In a specific preparation environment, magnetic nanomaterials can be prepared to have a single magnetic domain structure, which has more superior properties than ordinary permanent magnet materials, especially the use of permanent magnet materials made of rare earths in the field of motors under study, It has greatly improved the efficiency of electrical energy conversion. Permanent magnetism enterprises are worth trying and researching in this regard.
2) Nano magnetic recording materials
The experimental data show that when the grains of the material enter the nanometer size, they have magnetic properties that are not available for materials of the same composition under the usual structure. value. Therefore, the magnetic recording material prepared by it has higher electromagnetic resistance, higher audio and picture quality, and can achieve higher electromagnetic density. Especially in the recent industry, the use of multilayer films has improved to a greater extent. The storage capacity of nano-magnetic materials.
3) Nano Magnetic Liquid
The performance density of nano-magnetic liquids increases with the increase of the external magnetic field strength. Using the characteristic of magnetic materials, materials with different specific gravity can be separated on the specific gravity. By controlling different magnetic field strengths of magnetic materials, specific magnetic field conditions Separation between substances under a specific density. At the same time, magnetic liquids can also be used as magnetic lubricants to replace lubricants to reduce environmental pollution. This characteristic of magnetic liquid materials can be used in environmental governance, water treatment, adsorption desulfurization and other processes.
4) Soft magnetic material
Soft magnetic materials are mainly used in motor stators, rotors, transformers, relay cores, etc. Generally, materials that are easy to be repeatedly magnetized, and easy to demagnetize after the external magnetic field is removed, are required to be as small as possible, so nano-soft magnetic materials are an ideal choice.
5) Application of biomedicine
Magnetic nanomaterials can be used in medicine for magnetic resonance imaging contrast, magnetic drugs, magnetic sensitization, tissue repair, tumor magnetic hyperthermia, antibodies, drug molecules, gene reports, etc. , Gas-sensitive materials, sensors also have huge market demand.
6) Applications in other industries
In chemical applications, it can be used as a catalyst in chemical reactions, often with a longer life and better catalytic effect, and has been widely used in various reactions. Magnetic purification. Due to the characteristics of nanomaterials, solid matter is subjected to suction, cleaning, and desorption operations.