Chemistry

Researchers create golden aluminum, black platinum, blue silver

Researchers create golden aluminum, black platinum, blue silver

University of Rochester Associate Processor Chunlei Guo has developed a technique that uses a femtosecond laser to blast nanoscale features into the surface of a piece of metal–pretty much any metal. These tiny features interact selectively with white light to reflect a particular color–pretty much any color. It’s also possible to achieve a near-perfect black finish and iridescence. If the process can be made economical (it’s very slow at present, requiring about half an hour to treat a dime-sized area), it could be a complete game-changer when it comes to finishing metals. Guo gives the example of a bicycle factory that could use only a single laser to make parts of any color or color scheme.

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Thorium as the future of nuclear power?

Thorium as the future of nuclear power?

Interesting article over on Wired about Kirk Sorensen and the community served by his Energy From Thorium blog. To hear these people tell it, Thorium fission in fluid fuel reactors offers an idyllic vision of a boundless-energy-from-the-atom type future no one has really believed in since the early 50s. Thorium, reportedly, is abundant, safe, highly efficient as a nuclear fuel, and produces waste that is radioactive only for a few hundred years instead of tens of thousands. Also, the waste products from the Thorium cycle cannot be reprocessed to make bombs, which is the sole reason why it was not chosen as the basis for American nuclear energy technologies back in the 50s.

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How-To: Chemistry-themed Xmas ornaments

How-To: Chemistry-themed Xmas ornaments

Bethany Halford’s column in this week’s Chemical & Engineering News drew my attention to BEYONDbones, an official blog from the Houston Museum of Natural Sciences, and particularly to a couple of chemistry-related holiday projects. This page teaches how to make a crystalline ornament from pipe cleaners and saturated borax, and this one, how to use washable markers and a coffee filter to make tie-dye-like paper ornaments based on the principle of paper chromatography.

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Rocket fuel from aluminum and ice

The key to the process is that the metallic aluminum is present as a nano-scale powder, and its oxidation by water thus occurs over a huge surface area and therefore proceeds very quickly, releasing amazing amounts of energy. The video starts with the acoustic mixing of the nano-aluminum with water to make a gray paste which is frozen, in a mold, to make a tubular rocket motor. It then proceeds through various test-bench firings and culminates (at 4:00) in the launch of an actual rocket using the mixture.

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Make: Projects – Harvesting chemicals from a battery

Make: Projects – Harvesting chemicals from a battery

This tutorial shows how to take apart a spent zinc-carbon dry cell of the common household type. Besides making for an interesting object lesson in electrochemistry, taking apart a spent D-cell, for instance, allows you to salvage many materials which can be of use to amateur chemists–materials which would otherwise probably end up in a landfill. Separated from its reactive components, the leftover parts of the battery can be safely added to most municipal recycling streams.

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