Nano nano boron nitride powder takes us into the tiny world
Nano nano boron nitride powder has specific optical, electrical, magnetic, thermal, acoustic, mechanical, chemical and biological properties, and are widely used in industrial and civilian fields. The continuous development of Nano nano boron nitride powder preparation technology will definitely have a significant impact on the traditional chemical industry and other industries. The impact will bring huge changes to people lives and bring human development into a new stage.
Preparation method of Nano nano boron nitride powder:
Gas-phase method: The gas-phase method refers to the method of directly using gas or through various means to transform substances into gas, causing them to undergo physical or chemical reactions in the gas state. And finally it condense and grow to form nanoparticles in the cooling process.
Advantages: fine particles, less agglomeration. It can prepare metal carbides, nitrides, borides and other non-oxide ultrafine powders that are difficult to prepare by liquid phase method.
Disadvantages: high cost of equipment requirements.
Liquid phase method: The homogeneous solution is separated from the solvent through various ways. The solute is formed into particles of a certain shape and size to obtain the precursor of the required powder. After pyrolysis, the Nano nano boron nitride powder are obtained.
Features: Simple equipment, easy access to raw materials, high purity, good uniformity, accurate chemical composition control, etc. It is mainly used for the preparation of oxide-based ultrafine powders.
Excellent characteristics of Nano nano boron nitride powder:
High temperature, high hardness, and high strength are the eternal theme of the development of structural materials. The hardness of nanostructured materials is inversely proportional to the particle size (in accordance with the Hall-Retch relationship). The refinement of material grains and the existence of high-density interfaces will inevitably have a great impact on the mechanical properties of Nano nano boron nitride powder. Therefore, the slip and proliferation of dislocations in Nano nano boron nitride powder will not occur, which is the strengthening effect of nanocrystals.
The size of nanoparticles (10-100nm) is smaller than the wavelength of light waves, so they will have a complex interaction with incident light. Under proper evaporative deposition conditions, black metal ultrafine particles that easily absorb light can be obtained, called metallic black, which is in sharp contrast to the high-reflectivity glossy surface formed by metal during vacuum coating. Due to the quantum size effect, the absorption gloss of nano-semiconductor particles is generally blue-shifted. Nano nano boron nitride powder can be applied to infrared sensor materials due to their high light absorption rate. In addition, TIO2 ultrafine or nano particles can also be used for anti-ultraviolet products.
When people subdivide the macroscopic object into ultra-fine particles, it will show many strange properties, as, its optical, thermal, electrical, magnetic, mechanical, and chemical properties. They will be better and significantly different compared to those of large solid.
Academician Qian Xuesen predicted: "The structure around nanometers and below nanometers will be the characteristics of the next stage of scientific and technological development. It will be a technological revolution, and it will be another industrial revolution in the 21st century.”
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