A method to make diamonds from crude oil at explosive speed is developed


A method to make diamonds from crude oil at explosive speed is developed

Known as the hardest substance in naturediamondIn addition to being known as expensive jewelry, is also applied to industry such as electronic components, glass, grinding and polishing tools, and is an indispensable substance for civilized society. The disadvantage, however, was that the production of artificial diamonds was time-consuming. A research team at Stanford University has announced a technology that can instantly produce such artificial diamonds from substances derived from crude oil.

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Diamonds are crystallized carbon molecules when exposed to high temperatures and pressures for hundreds of millions of years near the mantle, which is deep underground. Diamonds created near the mantle were lifted near the surface by volcanic eruptions, and a sudden drop in temperature caused "KimberliteIn the igneous rocks called "", and appear where humans can reach. Due to this unusual production process, diamonds have been highly available and have been treated as valuable ores.

In 1954, an American researcher at 2000 ° C and 10 gigaPascalUsing an apparatus that can produce the above, we succeeded in synthesizing artificial diamonds for the first time in history. Then you can synthesize higher purity diamondChemical vapor depositionThe (CVD) method was also devised, and with the advancement of technology, human beings can synthesize artificial diamonds that are as good as natural diamonds. The following articles will help you understand the history of artificial diamonds and how to make them.

How to make artificial diamond indistinguishable from nature-gigazine

However, conventional methods require nickel, cobalt, and iron as catalysts for promoting crystallization. Although it is much shorter than several hundred million years, the synthesis of artificial diamondIt can take days or weeksConsumes a lot of power. Therefore, the development of a method that can further reduce the production cost of artificial diamond has been an issue.

Stanford University research team refined from crude oilTriamantaneI focused on a substance called. Triamantane is a powdered substance composed of carbon and hydrogen, whose molecular structure closely resembles the crystal structure of diamondDiamondoidIt is one kind of. The research team used Triamantane,Diamond anvil cellWe conducted an experiment in which the sample was placed in a pressure device called, and placed under various temperature and pressure conditions.

Then, at about 626 ° C and 20 gigapascal, the hydrogen atoms contained in triamantane were removed, the carbon atoms were aligned, and an extremely high-purity artificial diamond was synthesized in an instant. Traditional synthetic diamond synthesis required several steps until the carbon atoms became diamond, but a method discovered by a team at Stanford University changed directly from triamantane to diamond, It took only 19 microseconds (19 / million seconds).

However, the artificial diamond generated from triamantane in this experiment is very small, and at the time of writing the article, it is impossible to synthesize large artificial diamonds that can be used as jewelry. Wendy Mao, professor of geoscience at Stanford University, said, “ This experiment was done in the laboratory only and is not practical, '' while saying “ There are a few keys to making pure diamonds Was just clarified. "

If this technology can be applied, the cost of synthesizing artificial diamonds will drop dramatically, and artificial diamonds can be expected to be used in various fields such as medicine, biotechnology, and quantum computing. "If we can make small amounts of pure diamonds, we can produce pure diamonds for specific applications," said Yu Lin, the lead author of the paper.

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