Zinc Oxide: UVB, UVA2, UVA1: USA 25%, EU 25%, Japan no limit, Australia 20%: 1% gives a SPF of about 1: Zinc Oxide (micronized) UVB, UVA2, UVA1 1% gives a SPF of about 1.5: Zinc Oxide (micronized & coated) UVB, UVA2, UVA1 1% gives a SPF of about 1.5: Zinc Oxide (micronized) plus Titanium Dioxide: UVB, UVA2, UVA1 5% each gives a SPF of about 12-19: OM-Cinnamate plus [99] Radiation resistance[100] makes ZnO a suitable candidate for space applications. The pointed tips of ZnO nanorods result in a strong enhancement of an electric field. The oxidation state of zinc in this compound is +2 and for oxygen, it is -2. Zinc oxide is an inorganic compound with the formula ZnO. ZnO is a promising anode material for lithium-ion battery because it is cheap, biocompatible, and environmentally friendly. The depletion is necessary, because 64Zn is transformed into radioactive 65Zn under irradiation by the reactor neutrons.[93]. It is used as an additive in numerous materials and products including cosmetics, food supplements, rubbers, plastics, ceramics, glass, cement, lubricants, paints, ointments, adhesives, sealants, pigments, foods, batteries, ferrites, fire retardants, and first-aid tapes. It can be used as pigment or semiconductors in industries. Zinc oxide | ZnO or OZn | CID 14806 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, … As field-effect transistors, they even may not need a p–n junction,[103] thus avoiding the p-type doping problem of ZnO. Awareness of solar — induced skin conditions such as cancer, immune system suppression, and pre-mature skin aging have pushed consumers to look for products containing UV filters to provide UVA screening as well as SPF. It can be prepared by either the French or American process with a slight difference only but the final output in both cases is the same. ), ZnO could become ferromagnetic, even at room temperature. [13], Plastics, such as polyethylene naphthalate (PEN), can be protected by applying zinc oxide coating. [114], Zinc white, calamine, philosopher's wool, Chinese white, flowers of zinc, Except where otherwise noted, data are given for materials in their. Further, precipitation is calcined for obtaining the zinc oxide. The coating lets the visible part of the spectrum in but either reflects the infrared (IR) radiation back into the room (energy saving) or does not let the IR radiation into the room (heat protection), depending on which side of the window has the coating. Zinc oxide (ZnO) is used as a pretreatment step to remove hydrogen sulfide (H2S) from natural gas following hydrogenation of any sulfur compounds prior to a methane reformer, which can poison the catalyst. Copyright © 2020 Andlearning.org One application which has begun to be commercially available is the use of ZnO as the front contact for solar cells or of liquid crystal displays. 81.379 g mol-1. Some of the field-effect transistors even use ZnO nanorods as conducting channels. Kuhn, H. (1986) "Zinc White", pp. The coating reduces the diffusion of oxygen with PEN. When we are talking about the physical properties then it is grey to white in color and defined as the granular solid with a density of 5.68 g mL-1 and melting point is calculated as 1975 degree Celsius. [113] Exposure to zinc oxide in the air, which also occurs while welding galvanized (zinc plated) steel, can result in a nervous malady called metal fume fever. [98] Other properties of ZnO favorable for electronic applications include its stability to high-energy radiation and its possibility to be patterned by wet chemical etching. [108][109], In 2008 the Center for Nanostructure Characterization at the Georgia Institute of Technology reported producing an electricity generating device (called flexible charge pump generator) delivering alternating current by stretching and releasing zinc oxide nanowires. This problem occurs while melting brass because the melting point of brass is close to the boiling point of zinc. [92], Zinc oxide depleted in 64Zn (the zinc isotope with atomic mass 64) is used in corrosion prevention in nuclear pressurized water reactors. Therefore, its most common potential applications are in laser diodes and light emitting diodes (LEDs). For instance as transparent conducting oxide layer and ZnO nanostructures provide better light outcoupling. It is highly toxic in nature and it is dangerous for humans due to less concentration. This mini-generator creates an oscillating voltage up to 45 millivolts, converting close to seven percent of the applied mechanical energy into electricity. 81.379 g mol-1. ZnO has wide direct band gap (3.37 eV or 375 nm at room temperature). In form of a thin film ZnO has been demonstrated in miniaturised high frequency thin film resonators, sensors and filters. ZnO has a higher theoretical capacity (978 mAh g−1) than many other transition metal oxides such as CoO (715 mAh g−1), NiO (718 mAh g−1) and CuO (674 mAh g−1). [111], As a food additive, zinc oxide is on the U.S. FDA's list of generally recognized as safe, or GRAS, substances. The chemical formula for the compound could be written as ZnO with a molecular mass of approx. One more technique for preparing Zinc Oxide includes the wet process that is made up of pure zinc sulfate and chloride through precipitation of the carbonate. Zinc Oxide is an inorganic particulate UV filter long recognized for its safety and efficacy in broad spectrum protection in sunscreens. [104], Zinc oxide nanorod sensors are devices detecting changes in electric current passing through zinc oxide nanowires due to adsorption of gas molecules. At temperatures between about 230–430 °C (446–806 °F), H2S is converted to water by the following reaction: The zinc sulfide (ZnS) is replaced with fresh zinc oxide when the zinc oxide has been consumed.[94]. Zinc oxide is an inorganic chemical compound that is used as the main ingredient in preparing drugs or other medicines. This chemical compound is not soluble in water but soluble in acid or alkaline solutions. The coating protects polycarbonate from solar radiation, and decreases its oxidation rate and photo-yellowing. The components Zn and Al are much cheaper and less toxic compared to the generally used indium tin oxide (ITO). 169–186 in, Robinson, Victor S. (1978) "Process for desulfurization using particulate zinc oxide shapes of high surface area and improved strength", National Institute for Occupational Safety and Health, "A comprehensive review of ZnO materials and devices", "Hydrothermal growth of ZnO nanostructures", "Switching in Electrical Transmission and Distribution Systems", "Introduction to Electrical Power and Power Electronics", "Growth of ZnO nanowires on nonwoven polyethylene fibers", "Synthesis, microstructure and photoluminescence of well-aligned ZnO nanorods on Si substrate", General Information of Zinc from the National Institute of Health, WHO, and International Zinc Association, "The nucleotide sequence of the tetracycline resistance determinant tetM from Ureaplasma urealyticum", "Enhanced bioactivity of ZnO nanoparticles-an antimicrobial study", "Contemporary perspective on the use of fluoride products in caries prevention", "Enhancement of antibacterial properties of Ag nanorods by electric field", "Zinc oxide tape: a useful dressing for the recalcitrant finger-tip and soft-tissue injury", "Zinc oxide as the chemical for skin care", "Critical Wavelength & Broad Spectrum UV Protection", "Physical sunscreens: on the comeback trail", "Manufactured Nanomaterials and Sunscreens: Top Reasons for Precaution", "Nano-tech sunscreen presents potential health risk", "Small amounts of zinc from zinc oxide particles in sunscreens applied outdoors are absorbed through human skin", "ZnO nanoparticles enhanced antibacterial activity of ciprofloxacin against Staphylococcus aureus and Escherichia coli", Vincent van Gogh, 'Wheatfield with Cypresses, 1889, US Environment Protection Agency: Sunscreen, "ZnO – nanostructures, defects, and devices", "Ultraviolet Lasers Realized via Electrostatic Doping Method", "Light-controlling, flexible and transparent ethanol gas sensor based on ZnO nanoparticles for wearable devices", "Ion-beam-produced structural defects in ZnO", "Piezoelectric Nanowires Turn Fabric Into Power Source", "New Small-scale Generator Produces Alternating Current By Stretching Zinc Oxide Wires", "Bio-inspired Murray materials for mass transfer and activity", Diethylamino hydroxybenzoyl hexyl benzoate (Uvinul A Plus), Phenylbenzimidazole sulfonic acid (Ensulizole), https://en.wikipedia.org/w/index.php?title=Zinc_oxide&oldid=985177574, Pages using collapsible list with both background and text-align in titlestyle, Articles containing unverified chemical infoboxes, Creative Commons Attribution-ShareAlike License, 1,974 °C (3,585 °F; 2,247 K) (decomposes), This page was last edited on 24 October 2020, at 12:38.

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