Graphene :: Remember, remember, the velvet November


node:	Graphene
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created:	10.11.2015 - 01:26:35
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Change everything

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Čínský koncern GAC (Guangzhou Automobile Corporation) oznámil dokončení vývoje grafenové baterie: superrychlé nabíjení, dojezd 1 000 km, životnost 1 000 000 km.

- Baterie typ 3C se dobije z 0 na 80 % za 16 minut, z 30 na 80 % za 10 minut.
- Baterie typ 6C to na 80 % zvládne za 8 minut, ze 30 na 80 % za pouhých 5 minut.

Ještě při 80 % se nabíjelo obřím výkonem 481 kW, přesto výrobce tvrdí, že to nemá negativní dopad na životnost baterie.

Vůz Aion V se má začít prodávat v září 2021! Zároveň se startem prodeje mají po celé Číně začít růst superrychlé nabíječky schopné rekordně krátké nabíjecí časy předvést také v praxi.

src: https://m.vtm.zive.cz/clanky/svet-zaspal-v-cine-za-mesic-koupite-auto-s-grafenovou-baterii-a-dojezdem-1-000-km-nabije-se-za-8-minut/sc-870-a-211620

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http://mobil.idnes.cz/rychlonabijeci-baterie-huawei-dec-/mob_tech.aspx?c=A151117_235501_mob_tech_ada

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The Super Supercapacitor | Brian Golden Davis from Focus Forward Films on Vimeo.

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hej hej, zaujímavá látka to každopádne, ale skúmal niekto ako sa chovajú takéto materiály keď sa rozkladajú? tie nanokúsky či to nejako nepreniká do buniek alebo tak :D?

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To nepotrebujes skumat.

Ked poskladas z rakosia pruteny kosik, krory ma velku pevnost, ze hy si to nikdaj nepovedal, tak jeho rozklad a dopad na zdravie je maximalne v tom, ze ked sa s takym polorozpadnutym deravym kpsikom niekto bude dostatocne dlho hrat, tak si maximalne pichne do prsta

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pozri si tie články čo dal nižšie id wern

nehovorí sa o čiastočkách velkých ako trieska dreva, ale ako jeden makrofág

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http://www.rsc.org/chemistryworld/News/2012/February/graphene-inhaled-lungs.asp

http://www.popsci.com/you-probably-have-carbon-nanotubes-in-your-lungs

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no pekne....

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Uhlík ! :") A znova uhlík.. bude viac v pohode ako nádhery používané dnes v tom neprebernom množstve (potenciálnych) aplikácii.

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“The graphene speaker, with almost no specialized acoustic design, performs comparably to a high quality commercial headset,”
http://www.technologyreview.com/view/512496/first-graphene-audio-speaker-easily-outperforms-traditional-designs/

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"Graphene transistors aren’t just fast; they’re lightning fast. The speediest one to date clocked in at some 427GHz. That’s orders of magnitude more than what you can tease out of today’s processors. The problem with graphene transistors though is that they aren’t particularly good at turning off. They don’t turn off at all actually, which makes it hard to use them as switches.

Now, Guanxiong Liu and a team of researchers at University of California, Riverside have come up with a practical, highly technical solution. It boils down to “don’t treat graphene like it’s silicon”."
http://www.gizmodo.com.au/2013/08/scientists-just-figured-out-how-to-make-lightning-fast-graphene-cpus/

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MIT Technology Review: "How to Save the Troubled Graphene Transistor"

"The problem with graphene is that it has no band gap; electrons can flow at any energy. So the major focus of graphene engineers has been to find ways of creating an artificial band gap using methods such as applying electric fields, doping with atoms or by stretching and squeezing the material.

These approaches have met with modest success. Practical digital circuits require a band gap on the order of 1 eV at room temperature. But the best efforts with graphene have produced modest band gaps in the few hundred meV.

Even then this has come at a serious cost. The best graphene transistors are hugely fast but they dissipate energy like there’s no tomorrow and leak current like water through a sieve.

Now Liu and co have come up with an entirely different approach. “We intentionally avoid any attempt to artificially induce an energy band, which would make graphene “more-silicon-like”, they say. Instead they rely on a different phenomenon called negative resistance to create transistor-like behaviour.

Negative resistance is the counterintuitive phenomenon in which a current entering a material causes the voltage across it to drop. Various groups, including this one at Riverside, have shown that graphene demonstrates negative resistance in certain circumstances.

Their idea is to take a standard graphene field-effect transistor and find the circumstances in which it demonstrates negative resistance (or negative differential resistance, as they call it). They then use the dip in voltage, like a kind of switch, to perform logic.

In fact, the main contribution of this paper is to show how several graphene field-effect transistors can be combined and manipulated in a way that produces conventional logic gates.

And the results are promising. Liu and co demonstrate the effectiveness of their approach by designing a graphene-based circuit that can match patterns and show that it has several important advantages over silicon-based versions.

Negative%20resistance.png

http://www.technologyreview.com/view/518426/how-to-save-the-troubled-graphene-transistor/

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"Graphene-Based Non-Boolean Logic Circuits"

http://arxiv.org/abs/1308.2931

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caute,
narazil som na tento clanok, kde sa pise,ze vyrobili material 7-krat lahsi ako vzduch.
http://www.extremetech.com/extreme/153063-graphene-aerogel-is-seven-times-lighter-than-air-can-balance-on-a-blade-of-grass

mna by v tejto suvislosti zaujimalo, co to vlastne znamena, lahsi ako vzduch ? lahsi ako rovnaky objem vzduchu ? nemal by sa pootm ten material vznasat ?

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"The European Commission announced the winners of a multi-billion euro competition of Future and Emerging Technologies (FET). The winning Graphene and Human Brain initiatives are set to receive one billion euros each, to deliver 10 years of world-beating science at the crossroads of science and technology. Each initiative involves researchers from at least 15 EU Member States and nearly 200 research institutes."
http://myscienceacademy.org/2013/02/03/eu-invests-1-35-billion-to-develop-graphene/
http://www.bbc.co.uk/news/science-environment-21231960
http://www.nature.com/news/brain-simulation-and-graphene-projects-win-billion-euro-competition-1.12291

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Andre Geim won this year's Nobel prize in physics for graphene, but he never patented it. In an interview with Nature News, he explains why: 'We considered patenting; we prepared a patent and it was nearly filed. Then I had an interaction with a big, multinational electronics company. I approached a guy at a conference and said, "We've got this patent coming up, would you be interested in sponsoring it over the years?" It's quite expensive to keep a patent alive for 20 years. The guy told me, "We are looking at graphene, and it might have a future in the long term. If after ten years we find it's really as good as it promises, we will put a hundred patent lawyers on it to write a hundred patents a day, and you will spend the rest of your life, and the gross domestic product of your little island, suing us." That's a direct quote.'

link

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Andre Geim a Konstantin Novoselov ziskali aktualnu Nobelovu cenu za fyziku ohladom objavov v suvislosti s grafenom (graphene) - matierial vodivy, priehladny a hruby jeden atom.
http://cs.wikipedia.org/wiki/Grafen
http://www.nytimes.com/2010/10/06/science/06nobel.html?_r=1&hp
http://www.economist.com/blogs/babbage/2010/10/2010_nobel_prizes_0

nobel_winners_custom.jpg?t=1286306325&s=4

nobel_winners_custom.jpg?t=1286306325&s=4

Geim je zaroven drzitelom parodickej Ig Nobel Prize za levitaciu zaby z roku 2000.
http://en.wikipedia.org/wiki/Ig_Nobel_Prize

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and the winner is Andre Geim and Konstantin Novoselov "for groundbreaking experiments regarding the two-dimensional material graphene"

http://www.physorg.com/news205480712.html

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Researchers discover method for mass production of nanomaterial graphene

Process has already produced the largest graphene sample reported

Graphene is a perfect example of the wonders of nanotechnology, in which common substances are scaled down to an atomic level to uncover new and exciting possibilities.

Graphene is created when graphite — the mother form of all graphitic carbon, which is used to make the pigment that allows pencils to write on paper — is reduced down to a one-atom-thick sheet. Graphene is among the strongest materials known and has an attractive array of benefits. These sheets — single-layer graphene — have potential as electrodes for solar cells, for use in sensors, as the anode electrode material in lithium batteries and as efficient zero-band-gap semiconductors.

Research on graphene sheets has been restricted, though, due to the difficulty of creating single-layer samples for use in experiments. But in a study published online Nov. 9 in the journal Nature Nanotechnology, researchers from UCLA's California NanoSystems Institute (CNSI) propose a method which can produce graphene sheets in large quantities.

Led by Yang Yang, a professor of materials science and engineering at the UCLA Henry Samueli School of Engineering, and Richard Kaner, a UCLA professor of chemistry and biochemistry, the researchers developed a method of placing graphite oxide paper in a solution of pure hydrazine (a chemical compound of nitrogen and hydrogen), which reduces the graphite oxide paper into single-layer graphene.

Such methods have been studied by others, but this is the first reported instance of using hydrazine as the solvent. The graphene produced from the hydrazine solution is also a more efficient electrical conductor. Field-effect devices display output currents three orders of magnitude higher than previously reported using chemically produced graphene. Kaner and Kang's co-authors on the research were doctoral students Vincent Tung, from Yang's lab, and Matthew Allen, from Kaner's lab.

"We have discovered a route toward solution processing of large-scale graphene sheets," Tung said. "These breakthroughs represent the future of graphene nanoelectronic research."

The coverage of the graphene sheets can be controlled by altering the concentration and composition of the hydrazine solution. This hydrazine method also preserves the integrity of the sheets, producing the largest-area graphene sheet yet reported, 20 micrometers by 40 micrometers. A micrometer is one-millionth of a meter, while a nanometer is one billionth of a meter.

"These graphene sheets are by far the largest produced, and the method allows great control over deposition," Allen said. "Chemically converted graphene can now be studied in depth through a variety of electronic tests and microscopic techniques not previously possible."

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