Introduction to the properties of zinc oxide

2021-07-15

Zinc oxide is an inorganic compound with the chemical formula ZnO. It is an oxide of zinc, insoluble in water but soluble in acids and strong alkalis. Zinc oxide is a commonly used chemical additive, widely applied in the production of plastics, silicate products, synthetic rubber, lubricating oils, paints and coatings, ointments, adhesives, food, batteries, flame retardants, and more. With a large band gap and exciton binding energy, high transparency, and excellent room-temperature luminescence performance, zinc oxide is used in semiconductor applications such as liquid crystal displays, thin-film transistors, and light-emitting diodes. In addition, zinc oxide microparticles, as a nanomaterial, are also beginning to be used in related fields.

　　 Zinc oxide Zinc oxide is an inorganic compound with the chemical formula ZnO. It is an oxide of zinc. It is insoluble in water but soluble in acids and strong alkalis. Zinc oxide is a commonly used chemical additive, widely used in the production of plastics, silicate products, synthetic rubber, lubricating oils, paints and coatings, ointments, adhesives, food, batteries, flame retardants, etc. Zinc oxide has a large band gap and exciton binding energy, high transparency, and excellent room temperature luminescence performance. It is used in liquid crystal displays, thin-film transistors, and light-emitting diodes in the semiconductor field. In addition, micro-particle zinc oxide, as a nanomaterial, is also beginning to play a role in related fields.


Zinc oxide


　　Zinc oxide manufacturers are mainly concentrated in Liaoning (Dalian), Shandong (Weifang), Hebei (Gaoyi, Xingtai), Jiangsu, and Zhejiang. The produced zinc oxide mainly has a content of 99.7%, commonly known as 997 (99.7) zinc oxide. In recent years, nano zinc oxide, with its excellent nano-properties, has grown rapidly, and its application fields are becoming increasingly wider.

　　 Zinc oxide Physical Properties

　　Appearance and properties: White powder or hexagonal crystalline body. Odorless, tasteless, and non-gritty. It turns yellow when heated and turns white again after cooling. When heated to 1800℃, it sublimates. The covering power is half that of titanium dioxide and zinc sulfide. The coloring power is twice that of basic lead carbonate.

　　Solubility: Soluble in acids, concentrated alkali hydroxides, ammonia water, and ammonium salt solutions; insoluble in water and ethanol.

　　 Zinc oxide Chemical Properties

　　 Zinc oxide It is a famous white pigment, commonly known as zinc white. Its advantage is that it does not turn black when encountering H2S gas, because ZnS is also white. When heated, ZnO gradually changes from white to light yellow to lemon yellow. When cooled, the yellow color disappears. Using this characteristic, it can be added to paint or thermometers to make color-changing paint or color-changing thermometers. Because ZnO has astringency and a certain bactericidal ability, it is often used in medicine to make ointments. ZnO can also be used as a catalyst.

　　Chemical Reaction Formula:

　　Reaction with NaOH: ZnO + 2NaOH + H2O = Na2[Zn(OH)4]


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