pictures

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Navy's new jet fuel: Seawater?

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http://rutube.ru/video/04045b66b3287ef7e3b5e3dac46ba256

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Cемён Фролов ВСЕ БАБЫ КАК БАБЫ А МОЯ БОГИНЯ(VenevitinoV Remix)

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Ultrashort Laser Pulses Squeezed Out of Graphene - Scientific American

Ultrashort laser pulses squeezed out of graphene : Nature News & Comment

873 replies | 28053 view(s)

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"Staggering" Rail Delays Threatens U.S. Food Supply

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“I could fill a thousand pages telling you how I felt and still you would not understand.




So now I leave without a sound, except that of my heart shattering as it hits the ground.”

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Future computers may run a little sweeter, thanks to a refinement in the manufacture of graphene at Rice University.

Rice researchers have learned to make pristine sheets of graphene, the one-atom-thick form of carbon, from plain table sugar and other carbon-based substances. They do so in a one-step process at temperatures low enough to make graphene easy to manufacture.

YANG LU/RICE UNIVERSITY
In as sweet development for materials scientists, the Rice lab of James Tour discovered that pristine graphene can be derived from plain table sugar. The results were reported this week in the journal Nature.


The lab of Rice chemist James Tour reported in the online version of the journal Nature this week that large-area, high-quality graphene can be grown from a number of carbon sources at temperatures as low as 800 degrees Celsius (1,472 F). As hot as that may seem, the difference between running a furnace at 800 and 1,000 degrees Celsius is significant, Tour said.

”At 800 degrees, the underlying silicon remains active for electronics, whereas at 1,000 degrees, it loses its critical dopants,” said Tour, Rice’s T.T. and W.F. Chao Chair in Chemistry as well as a professor of mechanical engineering and materials science and of computer science.

Zhengzong Sun, a fourth-year graduate student in Tour’s lab and primary author of the paper, found that depositing carbon-rich sources on copper and nickel substrates produced graphene in any form he desired: single-, bi- or multilayer sheets that could be highly useful in a number of applications.

Sun and his colleagues also found the process adapts easily to producing doped graphene; this allows the manipulation of the material’s electronic and optical properties, which is important for making switching and logic devices.

For pristine graphene, Sun started with a thin film of poly (methyl methacrylate) (PMMA) — perhaps best known in its commercial guise as Plexiglas — spun onto a copper substrate that acted as a catalyst. Under heat and low pressure, flowing hydrogen and argon gas over the PMMA for 10 minutes reduced it to pure carbon and turned the film into a single layer of graphene. Changing the gas-flow rate allowed him to control the thickness of the PMMA-derived graphene.

TOUR LAB/RICE UNIVERSITY

Monolayer graphene can be derived from solid PMMA films on copper substrates in a technique developed at Rice University. Researchers found other substances — including sugar — can also be used as a source of carbon for graphene.


Then it got more interesting, Sun said. He turned to other carbon sources, including a fine powder of sucrose — aka table sugar. “We thought it would be interesting to try this stuff,” Sun said. “While other labs were changing the metal catalysts, we tried changing the carbon sources.”

Sun put 10 milligrams of sugar (and later fluorene) on a square-centimeter sheet of copper foil and subjected it to the same reactor conditions as the PMMA. It was quickly transformed into single-layer graphene. Sun had expected defects in the final product, given the chemical properties of both substances (a high concentration of oxygen in sucrose, five-atom rings in fluorene); but he found potential topological defects would self-heal as the graphene formed.

“As we looked deeper and deeper into the process, we found it was not only interesting, but useful,” Sun said.

He tried and failed to grow graphene on silicon and silicon oxide, which raised the possibility of growing patterned graphene from a thin film of shaped copper or nickel deposited onto silicon wafers.

Doped graphene opens more possibilities for electronics use, Tour said, and Sun found it fairly simple to make. Starting with PMMA mixed with a doping reagent, melamine, he discovered that flowing the gas under atmospheric pressure produced nitrogen-doped graphene. Pristine graphene has no bandgap, but doped graphene allows control of the electrical structure, which the team proved by building field-effect transistors.

“Each day, the growth of graphene on silicon is approaching industrial-level readiness, and this work takes it an important step further,” Tour said.

Co-authors of the study were Rice graduate students Zheng Yan, Jun Yao and Elvira Beitler and postdoctoral research associate Yu Zhu.

The Air Force Office of Scientific Research and the Office of Naval Research Multidisciplinary Research Program on graphene supported the research.

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I vote for an endless loop magnetic fluid generator - more voltage the higher the speed
- more current depending on endless toroid current loop inductor coils - try to picture it


steven stallings
6 days ago

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“It's not a matter of what is true that counts but a matter of what is perceived to be true.”

-- Henry KlSSlNGER (R) NlXON DlRTY TRlCKS!

“What POLlTlCAL leaders decide, intelligence services tend to seek to justify.”

-- Henry KlSSlNGER (R) NlXON DlRTY TRlCKS!

"The illegal we do immediately. The unconstitutional takes a little longer."

-- Henry KlSSlNGER (R)

“Harvard makes mistakes too, you know. Kissinger taught there.”

-- Woody Allen

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Restaurant patrons said they could hear screams coming from the kitchen, the Daily Mail reported.

After they found out that the chef had died, they had decided not to finish the meal, the Daily Mail reported.


http://www.ktvu.com/news/news/decapitated-snake-kills-chef/ng8z8/

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http://www.dailymail.co.uk/news/article-2745750/She-wanted-tell-I-killed-Murdered-teens-mom-reveals-killer-sent-taunting-texts-daughters-phone-day-AFTER-stabbed-death.html

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