Archive for the ‘carbon graphite’ Category

Researchers from North Carolina State University have discovered a new phase of solid carbon, called Q-carbon, which is distinct from the known phases of graphite and diamond. They have also developed a technique for using Q-carbon to make diamond-related structures at room temperature and at ambient atmospheric pressure in air.

Phases are distinct forms of the same material. Graphite is one of the solid phases of carbon; diamond is another.

“We’ve now created a third solid phase of carbon,” says Jay Narayan, the John C. Fan Distinguished Chair Professor of Materials Science and Engineering at NC State and lead author of three papers describing the work. “The only place it may be found in the natural world would be possibly in the core of some planets.”

Q-carbon has some unusual characteristics. For one thing, it is ferromagnetic – which other solid forms of carbon are not.

“We didn’t even think that was possible,” Narayan says.

In addition, Q-carbon is harder than diamond, and glows when exposed to even low levels of energy.
“Q-carbon’s strength and low work-function – its willingness to release electrons – make it very promising for developing new electronic display technologies,” Narayan says.

But Q-carbon can also be used to create a variety of single-crystal diamond objects. To understand that, you have to understand the process for creating Q-carbon.

Researchers start with a substrate, such as sapphire, glass or a plastic polymer. The substrate is then coated with amorphous carbon – elemental carbon that, unlike graphite or diamond, does not have a regular, well-defined crystalline structure. The carbon is then hit with a single laser pulse lasting approximately 200 nanoseconds. During this pulse, the temperature of the carbon is raised to 4,000 Kelvin (or around 3,727 degrees Celsius) and then rapidly cooled. This operation takes place at one atmosphere – the same pressure as the surrounding air.

The end result is a film of Q-carbon, and researchers can control the process to make films between 20 nanometers and 500 nanometers thick.

By using different substrates and changing the duration of the laser pulse, the researchers can also control how quickly the carbon cools. By changing the rate of cooling, they are able to create diamond structures within the Q-carbon.

“We can create diamond nanoneedles or microneedles, nanodots, or large-area diamond films, with applications for drug delivery, industrial processes and for creating high-temperature switches and power electronics,” Narayan says. “These diamond objects have a single-crystalline structure, making them stronger than polycrystalline materials. And it is all done at room temperature and at ambient atmosphere – we’re basically using a laser like the ones used for laser eye surgery. So, not only does this allow us to develop new applications, but the process itself is relatively inexpensive.”
And, if researchers want to convert more of the Q-carbon to diamond, they can simply repeat the laser-pulse/cooling process.

If Q-carbon is harder than diamond, why would someone want to make diamond nanodots instead of Q-carbon ones? Because we still have a lot to learn about this new material.

“We can make Q-carbon films, and we’re learning its properties, but we are still in the early stages of understanding how to manipulate it,” Narayan says. “We know a lot about diamond, so we can make diamond nanodots. We don’t yet know how to make Q-carbon nanodots or microneedles. That’s something we’re working on.”

NC State has filed two provisional patents on the Q-carbon and diamond creation techniques.
The work is described in two papers, both of which were co-authored by NC State Ph.D. student Anagh Bhaumik. “Novel Phase of Carbon, Ferromagnetism and Conversion into Diamond” will be published online Nov. 30 in the Journal of Applied Physics. “Direct conversion of amorphous carbon into diamond at ambient pressures and temperatures in air” was published Oct. 7 in the journal APL Materials.

humandiamond

An Treviso, Italian man’s 20-year-old son died in a car accident a few months ago and had already been buried. However, his father had his son’s remains exhumed, then cremated and finally had his remains turned into a remembrance diamond.

Corriere del Veneto reports that the owner of a Treviso funeral parlor said the 55-year-old father had visited his parlor to make funeral arrangements for his mother.

At that time, the man found some marketing material for a Swiss company called Algordanza, who offer the bizarre service of transforming human remains into artificial diamonds. From their website, it can be seen that they offer this service in quite a few countries in the world.

Silvia Zanardo, one of the partners of the funeral company, said that they explained the idea to the father and he asked them to help him, which they then did.

The funeral company then exhumed the son’s remains and cremated them, as the first step in the transformation process. After an eight-month waiting period, the father has finally received the diamond.

Apparently Algordanza has been operating in Italy since 2009, creating the “remembrance diamonds.”

Christina Sponza, a marketing representative for the company, explained how it works.

“The human body is formed in part by carbon, the same molecule that makes up the diamond.”

“With the cremation process, you get the carbon graphite. In Switzerland, the graphite is then pressed and held in very high temperatures, which simulate the pressure under which real diamonds are formed.”

“Finally, we deliver to relatives the diamond in a box, a sort of eternal funeral urn.”

The video below gives more detail of the process:

Read more: http://www.digitaljournal.com/news/odd%20news/italian-man-has-son-s-remains-turned-into-a-remembrance-diamond/article/364546#ixzz2oy8oOL89