Bismuth nanoparticles are nontoxic magnetic nanoparticles with high specific surface area

Overview of Bismuth Nanoparticles

Bismuth nanoparticles (or bismuth nanopowders, nanocrystals or nanocrystals) are non-toxic, magnetic nanoparticles with high specific surface area. Bismuth nanoparticles have a variety of applications, including as an additive to industrial lubricants, as an alloying agent in metallurgy, as a heat transfer medium in nuclear reactors, and as a contrast agent in medical imaging and cancer radiation therapy. Nanoscale bismuth particles are usually 30-80 nm (nm) in size and have a specific surface area (SSA) of 15-30 m2/g. They are also available in ultra-pure and high-purity, coated and dispersed forms.

Bismuth (Bi) is naturally a diamagnetic element with an atomic number 83. It is a pentavalent transition metal whose oxides and sulfides are important commercial ores. It has low thermal conductivity, high Hall coefficient and high resistivity. A thin layer of bismuth is deposited on the surface of the material to make it behave as a semiconductor. Similarly, bismuth is denser in the liquid phase than in the solid phase and expands by about 3% during solidification. This property allows it to be used as a component of the alloy to compensate for the shrinkage of other components in the alloy. Bismuth is relatively non-toxic and has a low melting point (271 ° C). About 63% of bismuth is used in cosmetics, pigments, and pharmaceuticals.26% is also used for galvanizing and casting in the metallurgical field.7% is used for bismuth alloys, soldiers and ammunition, and 4% is also used for research.

The traditional production methods of bismuth powder include water mist, gas atomization and ball milling. When atomizing and drying in water, the bismuth powder is oxidized easily due to the large surface area of the bismuth powder. Similarly, at high temperatures, the contact between bismuth and oxygen is easy to cause a lot of oxidation. Both methods result in many impurities, irregular shapes and uneven particle distribution of bismuth powder. In the ball milling method, the bismuth ingot is manually hammered with stainless steel to the bismuth granule ≤10mm, or the bismuth is quenched with water. The bismuth particles are then crushed by a ball mill lined with ceramic rubber in a vacuum environment. Although the ball mill in a vacuum has less oxidation and low impurities, the method is time-consuming and time-consuming, with low yield and high cost.

Applications of Bismuth Nanoparticles

Bismuth powder belongs to non-ferrous metal powder, and its character is light gray. Its use is very wide, mainly used in the preparation of bismuth products, bismuth alloy and bismuth compounds. The bismuth resources in China rank first in the world, and there are more than 70 bismuth deposits in China, which makes China the absolute superior country of bismuth in the world.

As a safe "green metal", bismuth is also widely used in semiconductors, superconductors, flame retardants, pigments, cosmetics and other fields besides the pharmaceutical industry. It is expected to replace toxic elements such as lead, antimony, cadmium and mercury. In addition, bismuth is the most diamagnetic metal, and its resistivity increases while its thermal conductivity decreases under the action of the magnetic field. It also has a good application prospect in thermoelectricity and superconductivity. In addition, the application range of nano-bismuth powder also includes:

Electronic material

Bismuth is a kind of environmentally friendly brittle metal with high resistivity and strong diamagnetism. It can be used in semiconductor materials and high-temperature superconducting materials.

Lubricating oil

The nanoscale bismuth powder has good lubrication properties and a synergistic effects with the active element sulfur in common lubricating oil additives. It is expected to replace lead and be used as a green lubricating oil additive.

Magnetism material

Bismuth nanomaterials have a magnetoresistive effect and thermoelectric effect, which may become magnetic induction materials and thermoelectric conversion materials with production and development value, and have wide application value.

Bismuth Nanoparticles Price

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