Titanium dioxide (B) or TiO2(B) is the monoclinicallotrope of titanium dioxide. The mineral is found in weathering rims on tektites and perovskite and as lamellae in anatase from hydrothermal veins and has a density lower than that of the other three allotropes. In crystallography, the monoclinic crystal system is one of the 7 lattice point groups. ... Allotropy (Gr. ... Titanium dioxide, also known as titanium(IV) oxide or titania, is the naturally occurring oxide of titanium, chemical formula TiO2. ... This article is about minerals in the geologic sense; for nutrient minerals see dietary mineral; for the band see Mineral (band). ... A tektite Tektites (from Greek tektos, molten) are natural glass objects, up to a few centimeters in size, which -according to most scientists- have been formed by the impact of large meteorites on Earths surface, although a few researchers favor an origin from the Moon as volcanic ejecta. ... Perovskite (calcium titanium oxide, CaTiO3) is a relatively rare mineral occurring in orthorhombic (pseudocubic) crystals. ... Lamellar structures are gill-shaped structures, with sheets of one material interleaved with another. ... Anatase is one of the three mineral forms of titanium dioxide. ...
In the laboratory anatase can be converted in a hydrothermal route to TiO2(B) nanotubes and nanowires[1] which are of potential interest as catalytic supports and photocatalysts. For this to happen anatase is mixed with 15Msodium hydroxide and heated at 150 °C for 72 hours. The reaction product is washed with dilute hydrochloric acid and heated at 400 °C for another 15 hours. the yield of nanotubes is quantitative and the tubes have an outer diameter of 10 to 20 nanometres and a inner diameter of 5 to 8 nanometres and have a length of 1 micrometres. A higher reaction temperature (170 °C) and less reaction volume gives the corresponding nanowires. An electronic device known as a diode can be formed by joining two nanoscale carbon tubes with different electronic properties. ... A nanowire is a wire of dimensions of the order of a nanometer ( meters). ... Concentration is a very common concept used in chemistry and related fields. ... Sodium hydroxide (NaOH), also known as caustic soda or lye, is a caustic metallic base used in industry (mostly as a strong chemical base) in the manufacture of paper, textiles, and detergents. ... The chemical substance hydrochloric acid is the aqueous (water-based) solution of hydrogen chloride (HCl) gas. ... A nanometre (American spelling: nanometer) is 1. ... A micrometre (American spelling: micrometer), symbol µm, is an SI unit of length. ...
External links
titanium dioxide page @ www.public.asu.edu
References
[1]Nanotubes with the TiO2-B structure Graham Armstrong, A. Robert Armstrong, Jesús Canales and Peter G. Bruce Chemical Communications, 2005, (19), 2454 - 2456 Abstract
[2]Titanium dioxide (TiO2) as photocatalyst, Green Quest Technology Inc.[1]
Titaniumdioxide occurrences in nature are never pure; it is found with contaminant metals such as iron.
Titaniumdioxide is thus added to paints, cements, windows, tiles, or other products for sterilizing, deodorizing and anti-fouling properties and is also used as a hydrolysis catalyst.
Titaniumdioxide white paint was used to paint the Saturn V rocket, which was the first rocket to send astronauts to the moon.
Titaniumdioxide occurrences in nature are never pure; it is found with contaminant metals such as iron.
Titaniumdioxide is the most widely used white pigment because of its brightness and very high refractive index (n=2.4), in which it is surpassed only by a few other materials.
Titaniumdioxide, particularly in the anatase form, is a photocatalyst under ultraviolet light.
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