Portrait by unknown artist, Ulloa became prominent as a scientist and was appointed to serve on various important scientific commissions. Ductile means the metal can be drawn into thin wires. It is a dull-grey metal that does not even look as good as stainless steel. Artificially radioactive isotopes of platinum have also been produced. Like diamonds, platinum comes from the earth's mantle. Platinum has a of about 1,773 °C 3,223 °F and a of about 3,827 °C 6,921 °F. It was named after the recently-discovered asteroid Pallas.
Platinum is perhaps the best material for electrical contacts, since it is not only hard, but will not tarnish. Isla de Léon, Cádiz, Spain, 5 July 1795 , natural history. Vernet äntô´nyō ŧħā ōōlyō´ä , 1716—95, Spanish scientist and naval officer. Platinum is not a silvery metal--it is grey--and is not found as bright, attractive nuggets like gold. Instead, they are usually obtained as byproducts from mining other metals, such as copper and nickel. Palladium was also identified in 1803; it will dissolve in nitric acid alone. History Of Platinum Though Antonio de Ulloa is the most commonly sited person when a discussion of who discovered platinum arises, there are other reports that he was not the first to find this metal, and they Spanish were not the first to put it to good use.
They reached the Pacific side of Panama on December 29, where de Ulloa conducted astronomical surveys. Reproduction by written permission only. Our gloves were indeed some defense to our hands, but our faces were entirely exposed; nor were our clothes a sufficient defense for the rest of our bodies, for their stings penetrating through the cloth, caused a very painful and fiery itching. The Greek osmh means an odour or smell, good or bad. Our common food in this inhospitable region was a little boiled rice, with some flesh or fowl, which we procured from Quito; and instead of fluid water, our pot was filled with ice; we had the same resource with regard to what we drank ; and while we were eating every one was obliged to keep his plate over a chafing-dish of coals, to prevent his provisions from freezing.
Credit for the modern rediscovery of platinum is usually given to Antonio de Ulloa. Ulloa had also gained fame among European scientists by founding an astronomical observatory and a mineralogical laboratory. De Ulloa relates, however, that he was treated with great courtesy by the British, who had a particular admiration for daring explorers and adventurers. By good luck they encountered Indians who were friendly, and who helped them construct shelters at night out of efficient local materials. A platinum-cobalt alloy is used to make very powerful magnets. It will explode a mixture of H 2 and O 2.
De Ulloa was glad they had brought mules, for these animals proved to be most adroit in navigating the precipitous mountain trails. The book was translated into English as A Voyage to 1758, 5th ed. The powdered metal gives off the tetroxide by catalyzing its own oxidation by the oxygen of the air. Platinum sponge is a sponge-like material of black platinum powder. As a young man he went to Peru with a scientific expedition, remaining in the country from 1736 to 1744; the result was an account of the people and the country published in 1748. The platinum soaks up hydrogen the way a sponge soaks up water. Platinum is also used in small amounts in alloys.
Overall, the greatest single use of platinum in the is in the manufacture of automobiles and trucks. Its atomic number is 78 and it is represented by the chemical symbol Pt. Unfortunately, on heating the material became porous. The two oxides, PtO and PtO 2, are unstable and decompose upon heating. The rest of his life was spent in quiet scholarly pursuits; he died in July 1795 on the Isle of Leon. My source does not say how the platinum was consolidated in these coins, but it was probably by the same welding or sintering process discovered by Wollaston.
If you hammered on it, you got a hammered black powder. IrO 4 exhibits iridescent colours that gave the metal its name. Also good for familiarization with Ununoctium. Extraction The major challenge in obtaining pure platinum is separating it from other platinum metals. Its crystal structure is face-centred cubic, characteristic of soft metals.
The image in the title shows a tasteful diamond-platinum ring, and will give an idea of the appearance of platinum. The pure metal is malleable and ductile , and lustrous and silvery in appearance. Ulloa worked in Ecuador from 1736 to 1744, during which time the two Spaniards discovered the element in the area. Ulloa died at Isla de Leon, , in 1795. A postage stamp issued in Spain in honor of Antonio de Ulloa, in the context of the third centenary of his birth 1716 , is presented. Catalytic converters on motor cars, which remove hydrocarbon residues, surely use some cheaper and less delicate catalyst at the present time. Other, much cheaper, catalysts such as nickel or iron have been substituted for platinum in recent years, so that platinum is retained only when no substitute can be found.