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Gratomic $GRAT.ca – Why The Hype About Graphene? $SRG.ca $NGC.ca $LLG.ca $GPH.ca $NOU.ca

Posted by AGORACOM at 9:22 AM on Wednesday, November 13th, 2019

SPONSOR: Gratomic Inc. (TSX-V: GRAT) Advanced materials company focused on mine to market commercialization of graphite products, most notably high value graphene based components for a range of mass market products. Collaborating with Perpetuus, Gratomic will use Aukam graphite to manufacture graphene products for commercialization on an industrial scale. For More Info Click Here

  • Graphene is the lightest, strongest and most electrically conductive substance on Earth
  • It has many uses in building materials, military equipment and smart technology
  • The Graphene+ 2019 conference at Swinburne will discuss cost-effective and sustainable solutions to industry problems using graphene
Professor Bronwyn Fox will chair a session on the impact of smart factories on jobs and graphene supply chains at the Graphene+ conference held at Swinburne.

Graphene is one of the most innovative materials to be developed and utilised this century.

Researchers at Swinburne have been heavily involved in its development, innovation and commercialisation. Later this month, the university will once again host the annual Graphene+ conference, bringing together industry leaders and academics to discuss the role graphene will play in the future of manufacturing and infrastructure.

What is graphene?

Graphene is both the lightest and strongest material known to man.  It is a single layer of carbon atoms arranged in a honeycomb-like structure and is the most electrically conductive substance on Earth.

It was discovered in 2004 by an unusual technique. Researchers from the University of Manchester in the UK used sticky tape to peel flakes from a lump of graphite, separating the layers until they were just one atom thick.

Graphene has proven highly versatile and has been used for building materials, military equipment, solar cells and smart devices.

Swinburne’s graphene ‘hub’

As part of the Graphene Supply Chain Cooperative Research Centre Projects (CRC-P), Swinburne is working with industry partner Imagine Intelligent Materials to develop graphene to meet strict quality assurances and to be used in large-scale manufacturing. It is also working to establish industry partnerships.

The material is also a key focus of the Next Generation Materials program, led by Professor Baohua Jia at Swinburne’s Manufacturing Future Research Institute (MFRI).

Director of the Manufacturing Future Research Institute, Professor Bronwyn Fox, says Swinburne researchers are working to establish standard knowledge and procedures for investors and suppliers of graphene.

“In the supply chain certification lab, we are developing the research to understand the relationship between the structure and performance of graphene so that industry can have security of supply, ensure successful applications and strengthen future investments in the technologies that utilise this material.”

Swinburne researchers have analysed the complete graphene supply chain – from production to industry practice. They have investigated graphene’s properties and tested its ability to combine with other materials in engineering developments, as well its potential to be used as a thin, protective coating. 

Graphene+ 2019

The use of graphene in the development of smart cities will be high on the agenda at the 2019 Graphene+ conference.

Other topics to be discussed include:

  • Upgrading sensing equipment for the Internet of Things (IoT)
  • Creating stronger, lightweight architectural structures using the latest in robotics technology
  • Commercialisation of one-step water purification systems to make drinking water universally available
  • Enhancing the harnessing and conserving of energy
  • Jobs of the future – how will graphene change the industry?

Researchers will share knowledge and discuss the potential of advanced, sustainable and cost-effective technologies, contributing to the establishment of cities that thrive on smart devices and infrastructure.

Professor Fox will also chair a session on the impact of smart factories on jobs and graphene supply chains.

“We are fortunate to have some world-leading local and international speakers. The discussions will give us a glimpse of what the future might look like with graphene at the forefront of technology.”

Source: http://www.swinburne.edu.au/news/latest-news/2019/11/why-the-hype-about-graphene.php

Gratomic Signs Deal to Supply Graphite to Todaq $SRG.ca $NGC.ca $LLG.ca $GPH.ca $NOU.ca

Posted by AGORACOM at 8:12 AM on Thursday, October 17th, 2019
  • Graphite is being purchased by Todaq to sit in reserve as a backstop to underpin the value of deployed TDN
  • The TDN will allow for cryptographic ownership and tracking of commodities as they are processed and traded.
  • The price of TDN was negotiated between the parties in respect of the first 1800 tonnes of graphite. Thereafter, the price of TDN will be based on the market price for TDN for the month in which subsequent orders are placed by Todaq

The graphite is being purchased by Todaq to sit in reserve as a backstop to underpin the value of deployed TDN. The TDN will allow for cryptographic ownership and tracking of commodities as they are processed and traded. The price of TDN was negotiated between the parties in respect of the first 1800 tonnes of graphite. Thereafter, the price of TDN will be based on the market price for TDN for the month in which subsequent orders are placed by Todaq. The price per tonne for graphite was negotiated between the parties and is fixed for the first 1800 tonnes. Thereafter, the price per tonne will be based on the price at which the Company sells similar product to third parties. Although Sheldon Inwentash, Co-CEO of the Company, acts as an advisor to TODAQ Holdings, the Supply Agreement was negotiated on an arm’s-length basis between Gratomic and Todaq without any involvement by Mr. Inwentash, and Gratomic is at arm’s length to Todaq and TODAQ Holdings.

The initial 1800 tonnes of graphite will be processed through the Company’s pilot processing plant. The Supply Agreement provides that the graphite to be delivered will comprise 95% carbon, contain no more than 0.5% moisture content and will be sized at 173 µm (0.173 mm) or less. Gratomic is in the process of finalizing and fine-tuning its commercial scale graphite processing plant referred to in the Company’s Press Release dated May 3, 2019.

Gratomic Executive Chairman and Co-CEO, Sheldon Inwentash commented, “Building our long-term treasury and creating secure digital ownership of commodities that can carry an immutable history of its quality, amount, handling, testing and custody, and which can move without friction through manufacturing chains or on trading platforms is where we need to be. As we move to production, this acquisition program creates the foundation to start that focused work”

Gratomic wishes to emphasize that Supply Agreement is conditional on Gratomic being able to bring the Aukam project into a production phase, and for any graphite being produced to meet certain technical and mineralization requirements.

Gratomic continues to move its business towards production and as part of its business plan, expects to obtain a National Instrument 43-101 Standards of Disclosure for Mineral Projects technical report to help it ascertain the economics of Aukam.

Presently the Company uses its existing pilot processing facility to produce certain amounts of graphite concentrate from accumulated surface graphite.

Risk Factors

The Company advises that it has not based its production decision on even the existence of mineral resources let alone on a feasibility study of mineral reserves, demonstrating economic and technical viability, and, as a result, there may be an increased uncertainty of achieving any particular level of recovery of minerals or the cost of such recovery, including increased risks associated with developing a commercially mineable deposit.

The Supply Agreement provides that if Gratomic is unable to deliver graphite in accordance with the orders from Todaq, Todaq has the right to refuse to take any subsequent attempt to fulfil the order, terminate the agreement immediately, obtain substitute product from another supplier and recover from the Company any costs and expenses incurred in obtaining such substitute product or suing for damages under the contract.

Historically, such projects have a much higher risk of economic and technical failure. There is no guarantee that production will begin as anticipated or at all or that anticipated production costs will be achieved.

Failure to commence production would have a material adverse impact on the Company’s ability to generate revenue and cash flow to fund operations. Failure to achieve the anticipated production costs would have a material adverse impact on the Company’s cash flow and future profitability.

Steve Gray, P.Geo. has reviewed, prepared and approved the scientific and technical information in this press release and is Gratomic Inc’s “Qualified Person” as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects.

About Gratomic Inc.

Gratomic is an advanced materials company focused on mine to market commercialization of graphite products most notably high value graphene based components for a range of mass market products. We are collaborating with a leading European manufacturer of graphenes to use Aukam graphite to manufacture graphene products for commercialization on an industrial scale. The company is listed on the TSX Venture Exchange under the symbol GRAT.

“Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.”

Gratomic $GRAT.ca – Bend It Like Graphene $SRG.ca $NGC.ca $LLG.ca $GPH.ca $NOU.ca

Posted by AGORACOM at 2:34 PM on Monday, September 30th, 2019

SPONSOR: Gratomic Inc. (TSX-V: GRAT) Advanced materials company focused on mine to market commercialization of graphite products, most notably high value graphene based components for a range of mass market products. Collaborating with Perpetuus, Gratomic will use Aukam graphite to manufacture graphene products for commercialization on an industrial scale. For More Info Click Here

  • The wonder material is yet to live up to its potential but an Indian startup is weaving dreams with this form of carbon

The molecule is priceless, but it’s not the cost — a few lakh rupees per kilo — that helped graphene win the epithet of “wonder material” or “possibly the most remarkable substance discovered” in scientific circles.

Graphene owes its impressive resume to its multiple attributes — strong, flexible, light, transparent, waterproof and a good conductor of electricity. Ever since it was discovered in 2004, scientists have been speculating about its potential uses — replacing silicon in electronics, indium in touchscreens and liquid polymer in bulletproof vests. Unfortunately, the wonder material has failed to deliver on its promises and still has a long way to go.

Despite that, scientists and entrepreneurs haven’t stopped pumping billions of dollars and man hours into the quest for new inventions with graphene that can transform sectors such as electronics, energy, health and construction.

Log 9 Materials, a Bangalore-based nanotechnology start-up, has been chasing the graphene dream since it was founded in 2015 by IIT-Roorkee graduates Akshay Singhal and Kartik Hajela. It has been trying to tame the material in many avatars — cigarette filters, batteries for electronic vehicles and coatings for aircraft. Their latest foray is into industrial clean up, including oil leaks and oil spills. Liquid petroleum often gets accidentally released into oceans, bays and rivers during transport and the spill does irreparable damage to aquatic life.

“The oil sorbent pads (LSP 20) innovated by us help contain and absorb off-shore and on-shore [oil] spills as well as spills of other chemicals,” says Akshay Singhal, co-founder and chief executive officer of Log 9 Materials. “LSP 20 is able to absorb spills up to 86 times its own weight. It has been tested against British Standards by third party laboratories and has also been certified safe to incinerate and dispose,” he adds.

There is always a risk of spillage during exploration, transportation and storage of oil. Spills have the potential to cause irreparable ecological damage in sea and on land. In situ combustion, oil booms and oil skimmer vessels are used to clean up such spills but are not very efficient. The products and particulates emitted through oil combustion pollute the atmosphere while booms and skimmers, which are meant to confine the spill to a specific location for collection, do not work well in turbulent water.

One of the most economical and efficient means of removing oil spills is to use sorbents that repel water (hydrophobic) but absorb oil (oleophilic).

Akshay Singhal, co-founder and chief executive officer of Log 9 Materials

One of the most efficient means of removing oil spills is to use sorbents that repel water but absorb oil

Various natural absorbers such as expanded perlite and zeolites, organic materials such as wool fibre, activated carbon and sawdust have all been used as sorbents because of their extremely small pores. However, these materials are incapable of absorbing oil without the water. That is why new materials are needed that can sequester oil and remove it. Various microporous polymers have been studied due to their large specific surface area and hydrophobicity. Although they show relative high absorption ability, the cost of these kinds of sorbents is also high.

Graphene, discovered at the University of Manchester, UK, in 2004, consists of thin flakes of carbon atoms arranged in a hexagonal structure. It has a high surface area. While a typical carbon atom has a diameter of about 0.33 nano metres, there are about three million layers of graphene in 1mm of graphite — a crystalline form of the element, carbon. Harder than diamond but more elastic than rubber, tougher than steel yet lighter than aluminium, it can be processed into various unique structures. Several graphene-based structures have been designed and fabricated over the past decade to strongly repel water (superhydrophobic) but absorb oil (superoleophilic) efficiently. These characteristics make graphene an ideal candidate for selective absorption of oil spills.

“We manufacture products to control spills of all forms, using graphene. These products can be used to prevent, control and clean spills in and around marine or terrestrial ecosystems,” says Dhananjay Sharma, director and chief executive officer, Log 9 Spill Containment Pvt. Ltd.

“The company has a larger agenda to educate various industries and businesses about the value propositions attached to using graphene-based products or offerings with respect to cost savings and environmental impact,” he adds.

While graphene has countless potential applications, Log 9’s focus is on two main areas: filtration and energy. Apart from the oil sorbent pad, they are currently working on a metal-air battery which could replace the current lithium ion batteries.

Says Singhal, “This battery makes use of the interaction of air, water and aluminium. The air cathode made of graphene generates electricity, thus making it lighter in weight compared to lithium ion batteries.” Moreover, these batteries can run about 1,000km on a single charge compared to 100-150km of the current ones.

Technology usually progresses at a slow pace. Swedish chemist Jakob Berzilius purified silicon in 1824 but it took more than a century for the semiconductor — used to run all modern electronic gadgets — industry to develop. Most of the components of today’s smartphones, from microprocessors to touchscreens, were also invented in the 1960s. It is, therefore, expected that it will take some time for more horizons to open up in the world of graphene. It is laudable that an Indian start-up has dared to join graphene’s innovation race.

Source: https://www.telegraphindia.com/science/bend-it-like-graphene/cid/1708387

Gratomic $GRAT.ca – Electric Vehicle Composites Market Analysis, Size, Share, Growth, Trends and Forecasts 2027 $SRG.ca $NGC.ca $LLG.ca $GPH.ca $NOU.ca

Posted by AGORACOM at 11:21 AM on Tuesday, September 3rd, 2019

SPONSOR: Gratomic Inc. (TSX-V: GRAT) Advanced materials company focused on mine to market commercialization of graphite products, most notably high value graphene based components for a range of mass market products. Collaborating with Perpetuus, Gratomic will use Aukam graphite to manufacture graphene products for commercialization on an industrial scale. For More Info Click Here

Key players operating in the global electric vehicle composites market include LANXESS, Hexagon Composites ASA, Solvay Group, Carbo Tech Composites GmbH, and DowDuPont.

  • Consume less fuel and they do not pollute the air
  • Exxon Company has fabricated an all-graphite frame and a glass/graphite hybrid body for its electric vehicles

Electric vehicles are gaining wide popularity, as they consume less fuel and they do not pollute the air. An electric vehicle uses one or more electric motors for propulsion. Governments across the globe are adopting and implementing favorable policies for promotion of electric vehicles. Composite materials used for production of various components of electric vehicles improve fuel efficiency. High strength and low density are two significant features of composite materials used in electric vehicles. A composite material used in electric vehicles is generally a combination of two components: a resin or matrix and a fiber or filler. The growing trend of abolition of conventional steel and cast iron in vehicles so as to make them lightweight has led to development of automotive components with lightweight materials. Due to their resistance to corrosion and fatigue, composites are more durable and hence, they are expected to last for the entire lifespan of the electric vehicle. Electric vehicle manufacturers make use of composite body/chassis components for extending the lifespan of hybrid electric vehicles as well as battery electric vehicles.

Read Report Overview @ https://www.transparencymarketresearch.com/electric-vehicle-composites-market.html

Increasing usage of lightweight materials with an aim to reduce carbon dioxide emissions is considered a major factor driving the electric vehicle composites market. Electric vehicle composites offer superior strength-to-weight ratio. Development of battery electric and hybrid electric vehicles offering long travel distance led by their reduced weight is anticipated to propel the electric vehicle composites market during the forecast period. Exxon Company has fabricated an all-graphite frame and a glass/graphite hybrid body for its electric vehicles, achieving a total weight reduction of 200 lbs. Budd Company, due to its subcontract with Ai Research, has achieved significant reduction in the weight of parts by using glass-reinforced polyester. Several electric vehicle manufacturers are opting for the development of sustainable composite materials for their automobile components.

In terms of material, the electric vehicle composites market can be classified into resins and fibers. The commonly employed resins include polyamide, polyester, epoxy, and polyurethane. The fibers segment comprises graphene, carbon nanotubes, glass, and aramids. In terms of structural component, the market can be categorized into exterior body panels, canter consoles, cross beam frames, and bumpers. In terms of application, the electric vehicle composites market can be divided into hybrid electric vehicles, plug-in hybrid electric vehicles, battery electric vehicles, and fuel cell electric vehicles.Geographically, the global electric vehicle composites market can be classified into North America, Europe, Asia Pacific, Latin America and Middle East & Africa. Various governments across the globe are promoting use of battery electric vehicles (BEVs) through high subsidies and tax rebates.

Request Report Brochure @ https://www.transparencymarketresearch.com/sample/sample.php?flag=B&rep_id=65759

BEVs is the most preferred choice of electric vehicles in China, which is the prominent market for electric vehicle composites in Asia Pacific. Advancements in material science and technology and increasing demand from the automotive industry are augmenting the electric vehicle composites market in Asia Pacific. North America is another significant market for electric vehicle composites across the globe. Tesla, a global leader in electric vehicle manufacturing, is located in California, the U.S. The electric vehicle composites market in Latin America and Middle East & Africa is estimated to expand at a moderate pace during the forecast period, owing to the recent economic growth in these regions.

SOURCE: https://financialexpressnow.com/2019/09/electric-vehicle-composites-market-analysis-size-share-growth-trends-and-forecasts-2027/

Gratomic $GRAT.ca: Researchers Use Graphene-Lined Clothes to Deter Mosquitoes $SRG.ca $NGC.ca $LLG.ca $GPH.ca $NOU.ca

Posted by AGORACOM at 7:38 PM on Friday, August 30th, 2019

SPONSOR: Gratomic Inc. (TSX-V: GRAT) Advanced materials company focused on mine to market commercialization of graphite products, most notably high value graphene based components for a range of mass market products. Collaborating with Perpetuus, Gratomic will use Aukam graphite to manufacture graphene products for commercialization on an industrial scale. For More Info Click Here

A study found that insects changed their behavior around the material.

Graphene, the highly flexible supermaterial used to build solar cells (and perhaps one day foldable phones), is also a powerful mosquito repellent. A team of researchers at Brown University discovered that graphene-lined clothing not only is an effective physical barrier to mosquito bites, the carbon-based material also changes their behavior. The study, which was published this week in the Proceedings of the National Academy of Sciences, found that graphene blocked the chemical signals that draw mosquitoes to other living beings in the first place.

“With the graphene, the mosquitoes weren’t even landing on the skin patch — they just didn’t seem to care,” said Brown Ph.D student Cintia Castillho, who is the study’s lead author. “We had assumed that graphene would be a physical barrier to biting, through puncture resistance, but when we saw these experiments we started to think that it was also a chemical barrier that prevents mosquitoes from sensing that someone is there.” In the study, researchers covered the arms of participants in either graphene oxide films covered by cheesecloth or just cheesecloth. Those who were covered in graphene didn’t receive a single bite.

Unfortunately, graphene oxide becomes far less effective when wet, which is exactly the type of environment where mosquitoes thrive. Scientists found that mosquitoes were able to puncture through graphene oxide films that were soaked in water. But when they used graphene with reduced oxygen content (rGO), they discovered it worked as a bite barrier in both dry and wet conditions.

One drawback is that rGO isn’t breathable, so it’s unlikely to be used in camping clothing. Scientists hope to find a way to stabilize graphene so it remains strong when wet. “This next step would give us the full benefits of breathability and bite protection,” said Brown University professor Robert Hurt.

If you’re curious about graphene, you won’t have long to wait. Makers of outdoor gear and electronics are already adding graphene to jackets, battery packs, shoes and more.

Source: https://www.engadget.com/2019/08/27/graphene-mosquito-repellent-boston-university-study/

Gratomic $GRAT.ca Samsung Developing Graphene Battery $SRG.ca $NGC.ca $LLG.ca $GPH.ca $NOU.ca

Posted by AGORACOM at 2:40 PM on Wednesday, August 21st, 2019

SPONSOR: Gratomic Inc. (TSX-V: GRAT) Advanced materials company focused on mine to market commercialization of graphite products, most notably high value graphene based components for a range of mass market products. Collaborating with Perpetuus, Gratomic will use Aukam graphite to manufacture graphene products for commercialization on an industrial scale. For More Info Click Here

  • Smartphones and portable electronic devices are omnipresent in the world we live in today. We rely heavily on these gadgets to complete a wide range of daily tasks from simple reminders and calendar events to more complex assignments and applications as powerful business tools.
  • At some point in the day, we will find ourselves rushing around a room searching for a plug or USB socket as a cable dangles from our hands because the lithium-ion batteries that currently power our devices still only hold a limited charge.

However, frustrations such as this could soon be a thing of the past. According to the reliable tech-tipster Evan Blass, Samsung is gearing up to a 2021 launch of their usually hotly anticipated Galaxy series to come equipped with a more efficient longer-lasting graphene battery.

On Monday, Evan Blass tweeted, “Samsung is hoping to have at least one handset either next year or in 2021, I’m told, which will feature a graphene battery instead.”

Capable of a full charge in under a half-hour, they still need to raise capacities while lowering costs.

Evan Blass

Graphene batteries are believed to be the optimal solution and alternative to the current generation of lithium-ion batteries on the market. With higher electrical and heat conductivity compared to lithium-ion solutions, graphene is also superior due to its lightweight, flexible and durable qualities. For these reasons, we can begin to understand why graphene has been hailed as a ‘wonder material’.

So, what would be the benefits of using the material graphene as an alternative to lithium-ion in battery packs?

Slimline solutions: having already discussed how graphene is lightweight, we should also consider that when you stack 3 million layers of this material, it only amounts to 1 mm of thickness. This could mean that manufacturers can place small high-capacity batteries in devices to reduce the overall size of the device for compactness or enhance other capabilities and overall performance.

Faster charging times: this increases the battery endurance compared to lithium-ion batteries as the conductivity capabilities of graphene offers little to no resistance to the flow of electrons.

Reduced thermal output: because of its ability to dissipate heat much more effectively, graphene can reduce the operating temperature of smart devices. This means better performance and safety when charging or operating the device for complex tasks or gaming.

These may be of particular interest to a company like Samsung who have previously been affected by battery issues, particularly concerning the overheating issues of the Note7 back in 2016. This led to Samsung implementing an eight-point inspection process for batteries as well as stepping up its research into battery technology, making significant progress in recent years.

We need only look back to 2017 when Samsung revealed its researchers developed a “graphene ball” material capable of five times faster-charging speeds than standard lithium-ion batteries. Coupled with Blass’s latest claims, it is plausible to expect that we will see graphene batteries go mainstream within the next couple of years.

With products likely restricted to select smartphones and smart devices initially, we can also anticipate further developments on other applications for graphene in the coming years. For example, Tesla are showing interest in metal-air batteries which utilize a graphene rod as a cathode. These types of battery can increase battery efficiency up to five times at just one-third of the cost and because of the greater abundance of carbon, compared to a rare metal like lithium, manufacturers will continue to research its potential as they have been trying to implement the use of graphene as a material in about everything since its discovery in 2004.

So, it would suffice to say that graphene batteries are definitely set to be a game-changer and put an end to panicked searches for a place to charge devices or carrying around multiple charging packs to get through a busy day.

SOURCE: https://www.azonano.com/news.aspx?newsID=36942

CLIENT FEATURE: Gratomic $GRAT.ca Developing Conductive Inks and Pastes from Aukam Graphite Mine $SRG.ca $NGC.ca $LLG.ca $GPH.ca $NOU.ca

Posted by AGORACOM at 1:40 PM on Monday, August 19th, 2019
  • Launches Gratink, conductive inks and pastes
  • The inks and pastes (to the best of the Company’s knowledge) are amongst the most conductive carbon inks and pastes currently available within the global market place.
  • The Gratink product is formulated specifically to meet the needs of the printed flexible electronics and EMI shielding markets
  • The Gratink and paste applications based on surface modified nano graphene “enablers” offer a product for market penetration into the information technology sector that is now an important aspect of our everyday life.  

About Gratomic Inc.

Gratomic is an advanced material company focused on mine to market commercialization of graphite products, most notably high-value graphene-based components for a range of mass market products.

Gratomic Hub on Agoracom

FULL DISCLOSURE: Gratomic is an advertising client of AGORA Internet Relations Corp.

Gratomic $GRAT.ca – University of Illinois Team Finds that Defects in Graphene Membranes may Improve Biomolecule Transport $SRG.ca $NGC.ca $LLG.ca $GPH.ca $NOU.ca

Posted by AGORACOM at 3:58 PM on Monday, August 12th, 2019

SPONSOR: Gratomic Inc. (TSX-V: GRAT) Advanced Materials company focused on mine to market commercialization of graphite products, most notably high value graphene based components for a range of mass market products. Collaborating with Perpetuus, Gratomic will use Aukam graphite to manufacture graphene products for commercialization on an industrial scale. Click Here for More Info

  • Nanopore membranes have generated interest in biomedical research because they help researchers investigate individual molecules – atom by atom – by pulling them through pores for physical and chemical characterization
  • Researchers have not yet produced a membrane with spiral defects in the laboratory, but that task may be easier than trying to rid a graphene membrane of the current molecule-immobilizing step defects

Researchers at the University of Illinois examined how tiny defects in graphene membranes, formed during fabrication, could be used to improve molecule transport. They found that the defects make a big difference in how molecules move along a membrane surface. Instead of trying to fix these flaws, the team set out to use them to help direct molecules into the membrane pores.

Nanopore membranes have generated interest in biomedical research because they help researchers investigate individual molecules – atom by atom – by pulling them through pores for physical and chemical characterization. This technology could ultimately lead to devices that can quickly sequence DNA, RNA or proteins.

In 2014, University of Illinois physics professor Aleksei Aksimentiev and graduate student Manish Shankla demonstrated a graphene membrane that controlled a molecule’s movement through a nanopore by means of electrical charge. They discovered that once the molecules are on the surface of the membrane, it is very difficult to get them to shuffle into the membrane’s pores because molecules like to adhere to the surface.

While on sabbatical at Delft University of Technology in the Netherlands, Aksimentiev found that DNA tends to accumulate and stick along the edges of fabrication-formed defects that occur as linear steps spanning across the membrane’s surface. The Illinois team’s goal was to find a way to use these flaws to direct the stuck molecules into the nanopores, as a principle that can also apply to the delivery, sorting and analysis of biomolecules.

To refine and confirm their observations, the researchers used the Blue Waters supercomputer at the National Center for Supercomputing Applications at Illinois and the XSEDE supercomputer to model the system and molecule movement scenarios at the atomic level.

“Molecular dynamics simulations let us watch what is happening while simultaneously measuring how much force is required to get the molecule to clear a step,” Aksimentiev said. “We were surprised to find that it takes less force to move a molecule down a step than up. Although it may seem intuitive that gravity would make stepping down easier, it is not the case here because gravity is negligible at the nanoscale, and the force required to move up or down should be the same.”

Aksimentiev said team members originally thought they could use concentric defect patterns that form around the pores to force the molecules down, but their simulations showed the molecules congregating along the edges of the steps. That is when it dawned on them: A defect with edges that spiral into a pore, combined with an applied directional force, would give the molecule no other option than to go into the pore – kind of like a drain.

“This way, we can drop molecules anywhere on the membrane covered with these spiral structures and then pull the molecules into a pore,” he said.

The researchers have not yet produced a membrane with spiral defects in the laboratory, but that task may be easier than trying to rid a graphene membrane of the current molecule-immobilizing step defects, they said.

“When manufactured at scale, defect-guided capture may potentially increase the DNA capture throughput by several orders of magnitude, compared with current technology,” Shankla said.

“After a long development process, we are excited to see this principle used in a variety of other materials and applications such as delivery of individual molecules to reaction chambers for experiments,” the researchers said.Source: Nature NanotechnologyEurekalert

Source: Nature Nanotechnology

Gratomic $GRAT.ca – A Quantum Phenomenon Highlights the Limits of Graphene Electronics $SRG.ca $NGC.ca $LLG.ca $GPH.ca $NOU.ca

Posted by AGORACOM at 12:11 PM on Monday, July 29th, 2019

Gratomic Inc. (TSX-V: GRAT) Advanced Materials company focused on mine to market commercialization of graphite products, most notably high value graphene based components for a range of mass market products. Collaborating with Perpetuus, Gratomic will use Aukam graphite to manufacture graphene products for commercialization on an industrial scale.

  • A quantum phenomenon that tests the limits of graphene’s use in electricity has been discovered by a research team from The University of Manchester, The University of Nottingham and The University of Loughborough.
https://www.scitecheuropa.eu/wp-content/uploads/2019/07/graphene-1-696x392.jpg

The research addressed how electrons in graphene scatter off the vibrating carbon atoms in the hexagonal crystal lattice. The researchers applied a magnetic field perpendicular to the atomically thin sheet of graphene. This magnetic field forced the current-carrying electrons to move in a closed circular orbit.

There is only one way for an electron from pure graphene to escape this orbit, this is by bouncing off a “phonon” in a scattering event. These phonons are particle-like bundles of energy and momentum. By warming graphene crystals for a very low temperature, researchers discovered they can generate these phonons.

Once the research team triggered the phonon scattering event, they passed a small electrical current through the sheet of graphene in order to measure the precise amount of energy and momentum that can be transferred between and electron and a phonon during the event.

What happens during these scatter events?

The researchers discovered that there are two types of phonon scatter. The first being named transverse acoustic (TA) phonons. TA phonons force the carbon atoms to vibrate perpendicular to the direction of phonon propagation and wave motions, such motion can be likened to the way waves flow on the surface of water.

The second type of phonon scatter is longitudinal acoustic (LA). LA phonons stimulate the carbon atoms to vibrate back and forth along the direction of the phonon and the wave motion, which motion is comparable to the motion sound waves make through the air.

By assessing these events, researchers have found a very accurate way to measure the speed of both types of phonons. Such measurements have indicated that the TA phonon scattering events dominate over LA phonon scattering.

Laurence Eaves and Roshan Krishna Kumar, co-authors of the work, said “We were pleasantly surprised to find such prominent magnetophonon oscillations appearing in graphene. We were also puzzled why people had not seen them before, considering the extensive amount of literature on quantum transport in graphene.”

Mark Greenaway, from Loughborough University, worked on the theory of this effect said: “This result is extremely exciting – it opens a new route to probe the properties of phonons in two-dimensional crystals and their heterostructures. This will allow us to better understand electron-phonon interactions in these promising materials, understanding which is vital to develop them for use in new devices and applications.”

SOURCE: https://www.scitecheuropa.eu/a-quantum-phenomenon-highlights-the-limits-of-graphene-electronics/96360/

Gratomic $GRAT.ca – Graphene Goes Mainstream $SRG.ca $NGC.ca $LLG.ca $GPH.ca $NOU.ca

Posted by AGORACOM at 3:18 PM on Wednesday, July 24th, 2019
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Kaustav Banerjee’s lab overcomes a stubborn obstacle to wide-scale deployment of graphene in the semiconductor industry

Ever since graphene, the flexible, two-dimensional form of graphite (think a 1-atom-thick sheet of pencil lead), was discovered in 2004, researchers around the world have been working to develop commercially scalable applications for this high-performance material.

Graphene is 100 to 300 times stronger than steel and has a maximum electrical current density orders of magnitude greater than that of copper, making it the strongest, thinnest and, by far, the most reliable electrically conductive material on the planet. It is, therefore, an extremely promising material for interconnects, the fundamental components that connect billions of transistors on microchips in computers and other electronic devices in the modern world.

For over two decades, interconnects have been made of copper, but that metal encounters fundamental physical limitations as electrical components that incorporate it shrink to the nanoscale. “As you reduce the dimensions of copper wires, their resistivity shoots up,” said Kaustav Banerjee, a professor in the Department of Electrical and Computer Engineering. “Resistivity is a material property that is not supposed to change, but at the nanoscale, all properties change.”

As the resistivity increases, copper wires generate more heat, reducing their current-carrying capacity. It’s a problem that poses a fundamental threat to the $500 billion semiconductor industry. Graphene has the potential to solve that and other issues. One major obstacle, though, is designing graphene micro-components that can be manufactured on-chip, on a large scale, in a commercial foundry.

“Whatever the component, be it inductors, interconnects, antennas or anything else you want to do with graphene, industry will move forward with it only if you find a way to synthesize graphene directly onto silicon wafers,” Banerjee said. He explained that all manufacturing processes related to the transistors, which are made first, are referred to as the ‘front end.’ To synthesize something at the back-end — that is, after the transistors are fabricated — you face a tight thermal budget that cannot exceed a temperature of about 500 degrees Celsius. If the silicon wafer gets too hot during the back-end processes employed to fabricate the interconnects, other elements that are already on the chip may get damaged, or some impurities may start diffusing, changing the characteristics of the transistors.

Now, after a decade-long quest to achieve graphene interconnects, Banerjee’s lab has developed a method to implement high-conductivity, nanometer-scale doped multilayer graphene (DMG) interconnects that are compatible with high-volume manufacturing of integrated circuits. A paper describing the novel process was named one of the top papers at the 2018 IEEE International Electron Devices Meeting (IEDM),  from more than 230 that were accepted for oral presentations. It also was one of only two papers included in the first annual “IEDM Highlights” section of an issue of the journal Nature Electronics.

Banerjee first proposed the idea of using doped multi-layer graphene at the 2008 IEDM conference and has been working on it ever since. In February 2017 he led the experimental realization of the idea by Chemical Vapor Deposition (CVD) of multilayer graphene at a high temperature, subsequently transferring it to a silicon chip, then patterning the multilayer graphene, followed by doping. Electrical characterization of the conductivity of DMG interconnects down to a width of 20 nanometers established the efficacy of the idea that was proposed in 2008. However, the process was not “CMOS-compatible” (the standard industrial-scale process for making integrated circuits), since the temperature of CVD processes far exceed the thermal budget of back-end processes.

To overcome this bottleneck, Banerjee’s team developed a unique pressure-assisted solid-phase diffusion method for directly synthesizing a large area of high-quality multilayer graphene on a typical dielectric substrate used in the back-end CMOS process. Solid-phase diffusion, well known in the field of metallurgy and often used to form alloys, involves applying pressure and temperature to two different materials that are in close contact so that they diffuse into each other.

Banerjee’s group employed the technique in a novel way. They began by depositing solid-phase carbon in the form of graphite powder onto a deposited layer of nickel metal of optimized thickness. Then they applied heat (300 degrees Celsius) and nominal pressure to the graphite powder to help break down the graphite. The high diffusivity of carbon in nickel allows it to pass rapidly through the metal film.

How much carbon flows through the nickel depends on its thickness and the number of grains it holds. “Grains” refer to the fact that deposited nickel is not a single-crystal metal, but rather a polycrystalline metal, meaning it has areas where two single-crystalline regions meet each other without being perfectly aligned. These areas are called grain boundaries, and external particles — in this case, the carbon atoms — easily diffuse through them. The carbon atoms then recombine on the other surface of the nickel closer to the dielectric substrate, forming multiple graphene layers.

Banerjee’s group is able to control the process conditions to produce graphene of optimal thickness. “For interconnect applications, we know how many layers of graphene are needed,” said Junkai Jiang, a Ph.D. candidate in Banerjee’s lab and lead author of the 2018 IEDM paper. “So we optimized the nickel thickness and other process parameters to obtain precisely the number of graphene layers we want at the dielectric surface. “Subsequently, we simply remove the nickel by etching so that what’s left is only very high-quality graphene — virtually the same quality as graphene grown by CVD at very high temperatures,” he continued. “Because our process involves relatively low temperatures that pose no threat to the other fabricated elements on the chip, including the transistors, we can make the interconnects right on top of them.”

UCSB has filed a provisional patent on the process, which overcomes the obstacles that, until now, have prevented graphene from replacing copper. Bottom line: graphene interconnects help to create faster, smaller, lighter, more flexible, more reliable and more cost-effective integrated circuits. Banerjee is currently in talks with industry partners interested in potentially licensing this CMOS-compatible graphene synthesis technology, which could pave the way for what would be the first 2D material to enter the mainstream semiconductor industry.

Support for the research has come from various sources over the years, including the National Science Foundation, the National Institute of Standards and Technology, Semiconductor Research Corporation, and currently, the U.S. Army Research Office and the University of California Research Initiatives.

Source: https://www.news.ucsb.edu/2019/019563/graphene-goes-mainstream