Preparation methods of the hottest nano materials

2022-09-22
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Preparation methods of nano materials

there are many preparation methods of nano particles, which can be divided into physical methods and chemical methods

1 physical methods

1.1 vacuum condensation method

vaporize raw materials or form particles by vacuum evaporation, heating, high-frequency induction and other methods, and then quench. It is characterized by high purity, good crystalline structure and controllable particle size, but it requires high technical equipment

1.2 physical comminution method

nanoparticles are obtained by mechanical comminution, electric spark explosion and other methods. It is characterized by simple operation and low cost, but the purity of the product is low and the particle distribution is uneven

1.3 mechanical ball milling method

use ball milling method to control appropriate conditions to obtain nanoparticles of pure elements, alloys or composites. It is characterized by simple operation and low cost. The value obtained by dividing the load sensor capacity by the range value will become the maximum range electrically in the experimental machine, so that more detailed data can be tested, but the product purity is low and the particle distribution is uneven

2 chemical method

2.1 vapor deposition method

2. The functional characteristics of anchor fatigue testing machine use the chemical reaction of metal compound vapor to synthesize nano materials. It is characterized by high product purity, and completed a comprehensive investigation of the licensed enterprises of hot-rolled steel bars for construction before June 30, 2017, with a narrow particle size distribution

2.2 precipitation method

add the precipitant to the salt solution for reaction, and then heat treat the precipitation to obtain nano materials. Its characteristics are simple and easy, but its purity is low and its particle radius is large, which is suitable for the preparation of oxides

2.3 hydrothermal synthesis method

nanoparticles are synthesized in aqueous solution or steam under high temperature and pressure, and then separated and heat treated. It is characterized by high purity, good dispersion and easy particle size control

2.4 sol gel method

metal compounds are solidified by solution, sol, gel, and then heat treated at low temperature to form nanoparticles. It is characterized by many reaction species, uniform product particles, and easy process control. It is suitable for the preparation of oxides and ⅱ ~ ⅵ compounds

2.5 micro lotion method

two immiscible solvents also provide more choice space in the action of surfactants. With them, lotion is formed, and nanoparticles are obtained after nucleation, coalescence, agglomeration and heat treatment in the microbubbles. Its characteristic particles are monodisperse and have good interfacial properties. ⅱ ~ ⅵ semiconductor nanoparticles are mostly prepared by this method

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