28 Facts About Zinc oxide

Crystalline zinc oxide is thermochromic, changing from white to yellow when heated in air and reverting to white on cooling.

In both cases, the zinc and oxide centers are tetrahedral, the most characteristic geometry for Zn.

Zinc oxide is noted for its strongly nonlinear optical properties, especially in bulk.

Zinc oxide vapor reacts with the oxygen in the air to give ZnO, accompanied by a drop in its temperature and bright luminescence.

Zinc oxide particles are transported into a cooling duct and collected in a bag house.

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Ordinary white powdered zinc oxide can be produced in the laboratory by electrolyzing a solution of sodium bicarbonate with a zinc anode.

Zinc oxide compounds were probably used by early humans, in processed and unprocessed forms, as a paint or medicinal ointment, but their composition is uncertain.

Zinc oxide ointment is mentioned by the Greek physician Dioscorides .

The zinc oxide is thought to have been produced by heating zinc ore in a shaft furnace.

Zinc oxide has been recovered from zinc mines at Zawar in India, dating from the second half of the first millennium BC.

Zinc oxide white was accepted as a pigment in oil paintings by 1834 but it did not mix well with oil.

In recent times, most zinc oxide was used in the rubber industry to resist corrosion.

Applications of zinc oxide powder are numerous, and the principal ones are summarized below.

For material science applications, zinc oxide has high refractive index, high thermal conductivity, binding, antibacterial and UV-protection properties.

When mixed with eugenol, a ligand, zinc oxide eugenol is formed, which has applications as a restorative and prosthodontic in dentistry.

Zinc oxide is used in mouthwash products and toothpastes as an anti-bacterial agent proposed to prevent plaque and tartar formation, and to control bad breath by reducing the volatile gases and volatile sulfur compounds in the mouth.

Zinc oxide is widely used to treat a variety of skin conditions, including atopic dermatitis, contact dermatitis, itching due to eczema, diaper rash and acne.

Zinc oxide can be used in ointments, creams, and lotions to protect against sunburn and other damage to the skin caused by ultraviolet light .

The nanoparticles are not absorbed into the skin more than regular-sized zinc oxide particles are, and are only absorbed into the outermost layer of the skin but not into the body.

Zinc oxide is added to many food products, including breakfast cereals, as a source of zinc, a necessary nutrient.

Zinc oxide was linked to dioxin contamination in pork exports in the 2008 Chilean pork crisis.

Zinc oxide is used as a pigment in paints and is more opaque than lithopone, but less opaque than titanium dioxide.

Micronized and nano-scale zinc oxide provides strong protection against UVA and UVB ultraviolet radiation, and are consequently used in sunscreens, and in UV-blocking sunglasses for use in space and for protection when welding, following research by scientists at Jet Propulsion Laboratory .

Paints containing zinc oxide powder have long been utilized as anticorrosive coatings for metals.

Zinc oxide paints retain their flexibility and adherence on such surfaces for many years.

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Zinc oxide depleted in Zn is used in corrosion prevention in nuclear pressurized water reactors.

Zinc oxide is used as a pretreatment step to remove hydrogen sulfide from natural gas following hydrogenation of any sulfur compounds prior to a methane reformer, which can poison the catalyst.

Zinc oxide itself is non-toxic; it is hazardous to inhale zinc oxide fumes, such as generated when zinc or zinc alloys are melted and oxidized at high temperature.