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TITANE

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Dioxyde de titane. SOCIETE FRANCAISE DE CHIMIE – Titane. Le titane fait partie des métaux de tran­si­tion.

SOCIETE FRANCAISE DE CHIMIE – Titane.

De numéro ato­mi­que 22 et de masse ato­mi­que de 47,8, c’est un métal léger d = 4,5. Le titane n’est pas un métal rare puis­que les sour­ces miné­ra­les répar­ties sur les mine­rais tels que l’ill­mé­nite FeTiO3 et le rutile TiO2 sont esti­mées à 600 Mt (en équivalent TiO2). Le titane a été décou­vert par le révé­rend William Gregor, un pas­teur miné­ra­lo­giste à ses heures, qui décou­vra en 1789 dans les sables des riviè­res de Cornouailles le « sable noir » qui était l’ill­mé­nite. Après dis­so­lu­tion, elle laissa appa­raî­tre un pré­ci­pité blanc qui était son oxyde. Ce n’est que 36 ans plus tard que Jacob Berzélius isola le titane, mais il fallut atten­dre plus de 100 ans, pour qu’en 1939 le pro­cédé Kroll, du nom du chi­miste luxem­bour­geois Wilhelm J. Ce pro­cédé conver­tit le dioxyde de titane en son chlo­rure, l’oxy­gène étant éliminé sous forme de monoxyde de car­bone, le chlo­rure étant réduit par le magné­sium : Sources.

Données TITANE. SCIENCE DAILY 09/09/08 Titanium Work Surfaces Could Cut Food Poisoning Cases Say Scientists. Food factory work surfaces coated in titanium could cut the number of food poisoning cases every year, scientists heard at the Society for General Microbiology's Autumn meeting being held this week at Trinity College, Dublin.

SCIENCE DAILY 09/09/08 Titanium Work Surfaces Could Cut Food Poisoning Cases Say Scientists

In the food industry surfaces must be easy to clean. Wear of food contact surfaces through abrasion, cleaning and impact damage increases the surface roughness. Researchers from Manchester Metropolitan University, UK have looked at the way different work surfaces harbour bacteria that could contaminate food. They discovered that titanium could be a better work surface than stainless steel, as some pathogenic bacteria find it more difficult to attach themselves to the metal. "It is important that surfaces in a hygienic environment are kept clean," said Adele Packer from Manchester Metropolitan University. The researchers looked at how bacteria are retained after cleaning to surfaces with scratches. MEATINFO 11/09/08 Titanium could fight food poisoning.

Speaking at the Society for General Microbiology's Autumn meeting being held this week at Trinity College, Dublin, researchers from Manchester Metropolitan University said that food factory surfaces coated in titanium could be easier to keep free of bacteria than more tradition stainless steel surfaces.

MEATINFO 11/09/08 Titanium could fight food poisoning

The scientists have looked at the way that different surfaces harbour bacteria that could contaminate food and found that some pathogenic bacteria found it more difficult to attach themselves to titanium. Researcher Adele Packer said: "It is important that surfaces in a hygienic environment are kept clean. Scratches may entrap micro-organisms such as Escherichia coli and protect them from being removed during cleaning.

"We measured scratches found on different surfaces and reproduced them in our lab. We coated the surfaces with titanium so that they all had the same chemistry and the only difference was the surface roughness. " Titanium. Titanium is a chemical element with symbol Ti and atomic number 22.

Titanium

It is a lustrous transition metal with a silver color, low density and high strength. It is highly resistant to corrosion in sea water, aqua regia and chlorine. The two most useful properties of the metal are corrosion resistance and the highest strength-to-density ratio of any metallic element.[6] In its unalloyed condition, titanium is as strong as some steels, but less dense.[7] There are two allotropic forms[8] and five naturally occurring isotopes of this element, 46Ti through 50Ti, with 48Ti being the most abundant (73.8%).[9] Although they have the same number of valence electrons and are in the same group in the periodic table, titanium and zirconium differ in many chemical and physical properties.

Titane. Un article de Wikipédia, l'encyclopédie libre.

Titane

Le titane est un élément chimique métallique de symbole Ti et de numéro atomique 22. Les propriétés industriellement intéressantes du titane sont sa résistance à la corrosion, souvent associée à la résistance à l’érosion et au feu, la biocompatibilité, mais aussi ses propriétés mécaniques (résistance, ductilité, fatigue, etc.) qui permettent notamment de façonner des pièces fines et légères comme les articles de sport.

Histoire[modifier | modifier le code] Le titane a été découvert par le révérend William Gregor en 1791[7], minéralogiste et pasteur britannique. En analysant des sables de la rivière Helford dans la vallée de Menachan en Cornouailles, il isola ce qu'il nomma du sable noir, connu aujourd’hui sous le nom d'ilménite. LENNTECH - Titanium (Ti) and water. Seawater contains 1 ppb of titanium.

LENNTECH - Titanium (Ti) and water

In phytoplankton titanium concentrations up to 30 ppm (dry mass) were discovered. River water contains only 3 ppb. EPA – TITANIUM.