Sentences with phrase «nanodiamonds at»

Not exact matches

That's at least 100 times larger than the nanodiamonds that form when planetary objects collide, and it's far larger than diamonds that form by condensing from carbon vapor inside clouds of interplanetary gas and dust.

In a series of papers, Firestone and his colleagues claimed various kinds of evidence for the hypothesis, including deposits of the element iridium (rare on Earth but abundant in meteorites), microscopic diamonds (called nanodiamonds), and magnetic particles in deposits at sites supposedly dated to about 12,800 years ago.

In tests, the researchers dispersed nanodiamonds in mineral oil and found that a very small concentration — one - tenth of a percent by weight — raised the thermal conductivity of the oil by 70 percent at 373 kelvins (about 211 degrees Fahrenheit).

Nanodiamonds smaller than 6 nanometers across have proven to be an effective additive to mineral oil for thermal - transfer and storage applications, according to researchers at Rice University.

«We've shown how to continuously flip the electron spin in a nanodiamond levitated in a vacuum and in the presence of different gases,» said Tongcang Li, an assistant professor of physics and astronomy and electrical and computer engineering at Purdue University.

The nanodiamond thermometers also have potential uses in chemistry to monitor how heat flows affect chemical reactions, especially at the interface between two substances, says David Awschalom, a physicist at the University of California in Santa Barbara, who led one of the earlier studies demonstrating diamond - based thermometry.

The Nitrogen - Vacancy defect (NV centre) in diamonds and diamond nanocrystals (nanodiamonds) provides a unique alternative for DNP as the NV centre electron spin can be optically polarized to over 90 % polarization at room temperature by short laser pulses.

«We developed a unique nanomechanical approach to precisely control and quantify the ultralarge elastic strain distributed in the nanodiamond samples,» said Yang Lu, associate professor at Chinese University of Hong Kong (CUHK).

United Kingdom About Blog The international and interdisciplinary forum, Fullerenes, Nanotubes, and Carbon Nanostructures, aims at publishing peer - reviewed research of original work in all areas of CARBON research including fullerenes, nanotubes, nanodiamond, graphene, any type of carbon nanostructure and any work dealing with carbon and carbon - related topics.

Schultz, professor of geological sciences at Brown and an impact specialist, said the most provocative evidence for an extraterrestrial impact was the discovery of nanodiamonds, microscopic bits of diamond formed only from the kind of intense pressure you'd get from a comet or meteorite slamming into the Earth.

According to Richard Kerr's news item that accompanies the article in Science, at least some experts are skeptical that Kennett and others have really found nanodiamonds, or that, even if they have, they are necessarily evidence of an impact.