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Home  /  Forum  /  Koffiekamer  /  Graphene, komt het eraan?

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Graphene, komt het eraan?

145 Posts
Pagina: «« 1 ... 3 4 5 6 7 8 »» | Laatste | Omlaag ↓
  4. forum rang 10 voda 7 juni 2015 11:46
    Coating power plants with graphene raises efficiency

    All types of power plants produce steam and the steam powers a turbine, and this creates electricity. The process is inefficient in that steam is often lost. By using graphene technologists think they can make power plants more efficient.

    With the operation of power plants, when steam has been used to drive the turbine, an attempt is made to condense it back into water and then the collected water is turned back into steam. This is a similar process with all power stations, whether they use fossil fuels or nuclear power to operate. This process is quite inefficient in that a sizeable quantity of the steam is lost through the condensers being unable to collect all of the gas.

    As a way to boost the collection efficiency of the steam, technologists have trailed out coating the inside of power plants with graphene, according to Controlled Environments. This layer is ultra-thin — just one atom thick.

    Graphene is a remarkably strong and low-weight material (it is 100 times stronger than steel and it conducts heat and electricity with great efficiency). The material is being investigated for many potential applications, including a new generation of quantum computers. The coating for power plants is a new application.

    Graphene works because it does not absorb water, but passes it back into the system, thereby conserving more steam. It is also highly durable, meaning that the single atom thick layers would not need replacing very often.

    Studies have shown the graphene layer boosts heat transfer, resulting in more steam being collected. Initial figures show a collection efficiency improvement of around 3 percent. This may not sound like much, but in energy and cost terms it is quite considerable. Furthermore, in capturing more steam, this reduces the level of carbon emissions.

    The research was conducted at MIT and the findings will soon be published in the journal Nano Letters.

    Source : Digital Journal
  6. forum rang 10 DeZwarteRidder 11 juni 2015 12:37
    quote:

    Ruijter schreef op 11 juni 2015 12:34:

    Is t t gokken waard om in graphene te beleggen? Verwachten jullie op (korte) termijn doorbraken? En waarop gebaseerd?
    Je kunt niet in graphene beleggen en bovendien zal het nog een hele poos duren voordat er een doorbraak is.
  7. forum rang 10 voda 30 juli 2015 20:13
    Metals of Africa confirms excellent graphene results in Mozambique

    Metals of Africa Limited released results from its graphene test work at the Montepuez Central graphite project located in Mozambique. The Company successfully produced graphene oxide and graphene at its 100% owned Montepuez Central graphite project. The three processes were tested and the thermal method, demonstrated produced the best results.

    Results indicated that the quality of the prepared graphene was comparable with that of synthetic graphene. The Company’s ongoing graphite evaluation work includes lab analysis, petrology and metallurgy.

    The Montepuez Central project’s ability to produce quality graphene product will further enhance its potential as a high value asset. The resource definition drilling programme will be completed at the end of August 2015.

    Cherie Leeden, Managing Director of the Company, commented, “The fact that our graphite can produce both graphene oxide and graphene is extremely exciting. Laboratory tests have verified that the quality of our graphene is comparable to synthetically derived graphene, which is a very high value material with an ever increasing number of applications, particularly in the battery and energy space.”

    Metals of Africa is an ASX listed metals explorations company with lead, zinc and silver operations in Mozambique; copper, rare earth elements and gold in Tanzania as well as lead and zinc operations in Gabon.

    Source : Africanmining.com
    Bijlage:
  8. forum rang 10 voda 30 juli 2015 20:20
    Caribou King Resources to acquire Aukam graphite mine in Namibia

    Canadian-based Caribou King Resources has announced an agreement to acquire Micron Investments, which holds an option to acquire 63 per cent of the Aukam mine, located on 125 000 acres in southern Namibia's Kharas Region.

    According to Caribou, infrastructure at the Aukam graphite project is good with access to the site possible throughout the year. The site is relatively close to a main tar road, and a national power grid passes two kilometres from the property. Water is available in large amounts from underground aquifers with an old pump station at the foot of the mountain, which was used to supply previous operations with water.

    Terms of the deal call for Caribou to issue 3.5 million shares to arms-length vendors and incur up to US$1.1 million in expenditure over an eighteen-month timeframe with year one's cash commitment approximately US$125 000. Caribou said the shares will be issued upon closing of the transaction and will be released for trading. The first 25 per cent of the shares are to be released four months from the date on which the purchaser receives all necessary approval with respect to Aukam (the trigger date); another 25 per cent in eight months from the trigger date; 25 per cent in 12 months and the final 25 per cent in 16 months from the trigger date.

    President Mr Mike England said “We see this acquisition as an opportunity to diversify our asset base into a jurisdiction that is considered by many to be one of the most mining friendly areas in the world. Aukam is the only past producer of graphite in Namibia and we look forward to redeveloping the site using modern technology and knowledge."

    "Global graphite demand is being driven by the development of new markets for clean and efficient energy alternatives, smart grid infrastructure and military capabilities," reads a statement released by Caribou.

    Caribou King Resources is a publicly-traded Canadian junior exploration company that holds a portfolio of prospective graphite projects at various stages of exploration and assessment.

    Source : New Era
    Bijlage:
  9. forum rang 6 haas 29 augustus 2015 00:35
    quote:

    nobahamas schreef op 5 september 2014 22:23:

    Gelukkig heeft het bestuur van Tesla meer realiteitszin dan hirshi, en beleggen ze 5 miljard Dollar in een Silicium-Ion accufabriek, en niet in hennep plantages.

    Oh ja, ze zijn op zoek nar 93.000 ton aan graphene flakes voor de productie van de anodes (voor de productie van de eerste twee jaar na start).
    Alternatieven zijn altijd welkom, laat maar zien.
    www.dailyfinance.com/2014/09/03/tesla...
    Tesla (TSLA) Enters Lithium Supply Deal With Bacanora Minerals and Rare Earth Minerals

    www.zacks.com/stock/news/188164/tesla...
  10. nobahamas 30 september 2016 22:58
    En?
    Hoever zijn we nu?
    Nog steeds niet veel verder. Echt grafeen maken kunnen we nog steeds niet.
    Op micro-schaal lukt het al wel, al blijven het "nano particles".
    De toepassingen voor deze kleine deeltjes groeien wel snel.
    Als voorbeeld Haydale graphene Industries;
    www.google.com/finance?q=LON%3AHAYD&a...
    heeft al aardig wat bedrijven opgekocht die fiks geld verdienen aan de ontwikkeling en toepassingen van deze kleine deeltjes.
    Voor verdere info:
    www.haydale.com/publications/q-a-with...
    www.haydale.com/working-with-us/case-...

    p.s. ze hebben een partnership met ons AMG!
  12. nobahamas 6 oktober 2016 20:40
    Zenyatta ziet er sterk uit, zeker door de samenwerking met Larisplast.
    hmmm.... carbonversterkt beton...
    Sterker en dus lichter bouwen, met hoogbouw meer woonlagen per hoogte-eenheid.
    minder energiekosten voor productie van het beton.
    Als grondstof ook beter toepasbaar voor het "printen" van bouwwerken.
    Zal ook zeker een betere aarding geven voor de zweverige types.
  14. forum rang 10 voda 9 januari 2017 16:57
    Porous, 3-D forms of graphene developed at MIT can be 10 times as strong as steel but much lighter

    January 6, 2017

    A three-dimensional graphene assembly and scanning electron microscope image of a graphene assembly (insert, scale bar, 20 µm). Credit: Qin et al. Sci. Adv. 2017;3:e1601536

    A team of researchers at MIT has designed one of the strongest lightweight materials known, by compressing and fusing flakes of graphene, a two-dimensional form of carbon. The new material, a sponge-like configuration with a density of just 5 percent, can have a strength 10 times that of steel.

    In its two-dimensional form, graphene is thought to be the strongest of all known materials. But researchers until now have had a hard time translating that two-dimensional strength into useful three-dimensional materials.

    The new findings show that the crucial aspect of the new 3-D forms has more to do with their unusual geometrical configuration than with the material itself, which suggests that similar strong, lightweight materials could be made from a variety of materials by creating similar geometric features.

    The findings are being reported today in the journal Science Advances, in a paper by Markus Buehler, the head of MIT's Department of Civil and Environmental Engineering (CEE) and the McAfee Professor of Engineering; Zhao Qin, a CEE research scientist; Gang Seob Jung, a graduate student; and Min Jeong Kang MEng '16, a recent graduate.

    Other groups had suggested the possibility of such lightweight structures, but lab experiments so far had failed to match predictions, with some results exhibiting several orders of magnitude less strength than expected. The MIT team decided to solve the mystery by analyzing the material's behavior down to the level of individual atoms within the structure. They were able to produce a mathematical framework that very closely matches experimental observations.

    The closely packed graphene-inclusion structure obtained after cyclic equilibrations. Credit:Qin et al. Sci. Adv. 2017;3:e1601536

    Two-dimensional materials—basically flat sheets that are just one atom in thickness but can be indefinitely large in the other dimensions—have exceptional strength as well as unique electrical properties. But because of their extraordinary thinness, "they are not very useful for making 3-D materials that could be used in vehicles, buildings, or devices," Buehler says. "What we've done is to realize the wish of translating these 2-D materials into three-dimensional structures."

    The team was able to compress small flakes of graphene using a combination of heat and pressure. This process produced a strong, stable structure whose form resembles that of some corals and microscopic creatures called diatoms. These shapes, which have an enormous surface area in proportion to their volume, proved to be remarkably strong. "Once we created these 3-D structures, we wanted to see what's the limit—what's the strongest possible material we can produce," says Qin. To do that, they created a variety of 3-D models and then subjected them to various tests. In computational simulations, which mimic the loading conditions in the tensile and compression tests performed in a tensile loading machine, "one of our samples has 5 percent the density of steel, but 10 times the strength," Qin says.

    Buehler says that what happens to their 3-D graphene material, which is composed of curved surfaces under deformation, resembles what would happen with sheets of paper. Paper has little strength along its length and width, and can be easily crumpled up. But when made into certain shapes, for example rolled into a tube, suddenly the strength along the length of the tube is much greater and can support substantial weight. Similarly, the geometric arrangement of the graphene flakes after treatment naturally forms a very strong configuration.

    The new configurations have been made in the lab using a high-resolution, multimaterial 3-D printer. They were mechanically tested for their tensile and compressive properties, and their mechanical response under loading was simulated using the team's theoretical models. The results from the experiments and simulations matched accurately.

    Tensile and compressive tests on the printed sample. Credit: Qin et al. Sci. Adv. 2017;3:e1601536

    The new, more accurate results, based on atomistic computational modeling by the MIT team, ruled out a possibility proposed previously by other teams: that it might be possible to make 3-D graphene structures so lightweight that they would actually be lighter than air, and could be used as a durable replacement for helium in balloons. The current work shows, however, that at such low densities, the material would not have sufficient strength and would collapse from the surrounding air pressure.
    But many other possible applications of the material could eventually be feasible, the researchers say, for uses that require a combination of extreme strength and light weight. "You could either use the real graphene material or use the geometry we discovered with other materials, like polymers or metals," Buehler says, to gain similar advantages of strength combined with advantages in cost, processing methods, or other material properties (such as transparency or electrical conductivity).
    "You can replace the material itself with anything," Buehler says. "The geometry is the dominant factor. It's something that has the potential to transfer to many things."

  15. forum rang 10 voda 9 januari 2017 16:58
    Deel 2:

    The unusual geometric shapes that graphene naturally forms under heat and pressure look something like a Nerf ball—round, but full of holes. These shapes, known as gyroids, are so complex that "actually making them using conventional manufacturing methods is probably impossible," Buehler says. The team used 3-D-printed models of the structure, enlarged to thousands of times their natural size, for testing purposes.

    Model of gyroid graphene with 20 nm length constant. Credit: Qin et al. Sci. Adv. 2017;3:e1601536

    For actual synthesis, the researchers say, one possibility is to use the polymer or metal particles as templates, coat them with graphene by chemical vapor deposit before heat and pressure treatments, and then chemically or physically remove the polymer or metal phases to leave 3-D graphene in the gyroid form. For this, the computational model given in the current study provides a guideline to evaluate the mechanical quality of the synthesis output.

    The same geometry could even be applied to large-scale structural materials, they suggest. For example, concrete for a structure such a bridge might be made with this porous geometry, providing comparable strength with a fraction of the weight. This approach would have the additional benefit of providing good insulation because of the large amount of enclosed airspace within it.

    Because the shape is riddled with very tiny pore spaces, the material might also find application in some filtration systems, for either water or chemical processing. The mathematical descriptions derived by this group could facilitate the development of a variety of applications, the researchers say.

    Explore further: New study shows nickel graphene can be tuned for optimal fracture strength

    More information: "The mechanics and design of a lightweight three-dimensional graphene assembly," Science Advances, DOI: 10.1126/sciadv.1601536 , advances.sciencemag.org/content/3/1/e1601536
    Journal reference: Science Advances
    Provided by: Massachusetts Institute of Technology

    Read more at: phys.org/news/2017-01-porous-d-graphe...

    phys.org/news/2017-01-porous-d-graphe...
    Bijlage:
  16. forum rang 10 voda 11 mei 2017 17:12
    MIT Physicists unleash Graphene's superconductive power
    Published on Thu, 11 May 2017

    Science alert.com reported that physicists have found a new way to turn 'wonder material' graphene into a ridiculously powerful superconductor, capable of shuttling electricity with zero resistance. Graphene is already an overachiever - just one atom thick, it's stronger than steel, harder than diamond, and incredibly flexible. And last year, it became even more amazing, when scientists found a way to unleash its long-rumoured superconductive abilities. Now, for the first time, scientists have shown that they can achieve a new type of superconductivity simply by putting graphene in contact with other superconductors.

    Superconductivity is a big deal, even for a material as talented as graphene. Normal conductors such as silver and copper are good at carrying an electrical current, but electrons travelling through them still bounce off defects in the material, losing energy as they go.But inside superconductors, electrons pair up and move through the material as one, without losing any energy to friction.

    That's important, because if we could find a way to achieve superconductivity at room temperature, it would lead to vastly more efficient electronic devices, not to mention power lines. Right now, energy companies are losing about 7% of their energy as heat as a result of resistance in the grid.

    So far, graphene has only been shown to become superconductive at super-chilled states, and this new experiment is no different.

    But thanks to the material's other remarkable properties, that's still worth getting excited about, seeing as we could one day use graphene to build tiny, high-speed electronic devices that don't waste any energy as heat.

    In the latest study, physicists from MIT took a flake of graphene and sandwiched it between aluminium, which behaves at a superconductor at low temperatures. They chilled the entire set-up to around 20 millikelvin (-273.13 degrees Celsius or -459.6 degrees Fahrenheit), switching on aluminium's superconductive abilities.

    When that happened, the team showed that it caused graphene to changes its electronic state dramatically and actually take on some of the qualities of the superconductors.

    Lead researcher Landry Bretheau said that "[The superconductors] are actually giving graphene some superconducting qualities. We found these electrons can be dramatically affected by superconductors."

    Most importantly, instead of the electrons in graphene acting as individual, scattering particles, they started to pair up into what's known as 'Andreev states' - a configuration that allows materials that traditionally aren't superconductive to carry a 'supercurrent' that flows without losing energy.

    Unlike electron pairs in traditional superconductive materials, which are known as Cooper pairs, the electrons in graphene actually pair up out of frustration, as they're being pulled two different directions by the superconductors on either side of the sandwich.

    Mr Bretheau said that “Electrons in a superconductor dance harmoniously in pairs, like a ballet, but the choreography in the left and right superconductors can be different. Pairs in the central graphene are frustrated as they try to satisfy both ways of dancing. These frustrated pairs are what physicists know as Andreev states; they are carrying the supercurrent."

    This effect was first predicted back in 1962 by British physicist Brian David Josephson, but this is the first time it's ever been shown to be possible within graphene, or any two-dimensional material.

    Source : Science alert.com
    Bijlage:
  17. forum rang 6 haas 26 oktober 2017 22:20
    quote:

    haas schreef op 27 december 2013 23:04:

    ËN:

    Mason Graphite Inc.
    LLGTSX VentureMining
    Latest
    0.69
    C$
    Change
    0.13
    23.214 %
    Volume
    1,132,874
    =========================
    SGL Carbon SE
    CAD 2.64(yld 100%)

    Mason Graphite Inc (CVE:LLG) Director Tyrone Mark Docherty sold 10,000 shares of the firm’s stock in a transaction that occurred on Monday, October 16th. The shares were sold at an average price of C$2.43, for a total transaction of C$24,300.00.
    Tyrone Mark Docherty also recently made the following trade(s):
    On Wednesday, September 27th, Tyrone Mark Docherty sold 2,100 shares of Mason Graphite stock. The shares were sold at an average price of C$2.00, for a total transaction of C$4,200.00.
    Separately, National Bank Financial increased their target price on shares of Mason Graphite from C$2.60 to C$2.90 and gave the company an “outperform” rating in a research report on Thursday, October 12th.

  19. forum rang 6 haas 23 juli 2019 07:14
    quote:

    haas schreef op 26 oktober 2017 22:20:

    [...]

    CAD 2.64(yld 100%)

    Mason Graphite Inc (CVE:LLG) Director Tyrone Mark Docherty sold 10,000 shares of the firm’s stock in a transaction that occurred on Monday, October 16th. The shares were sold at an average price of C$2.43, for a total transaction of C$24,300.00.
    Tyrone Mark Docherty also recently made the following trade(s):
    On Wednesday, September 27th, Tyrone Mark Docherty sold 2,100 shares of Mason Graphite stock. The shares were sold at an average price of C$2.00, for a total transaction of C$4,200.00.
    Separately, National Bank Financial increased their target price on shares of Mason Graphite from C$2.60 to C$2.90 and gave the company an “outperform” rating in a research report on Thursday, October 12th.

    tijdje geleden:)
145 Posts
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