Sentences with phrase «graphene membranes»

The team tested the graphene membranes by passing water, salts and other molecules through them, and found the material's performance «comparable to graphene membranes made using conventional, small - batch approaches.»

With graphene membranes, it becomes simply a matter of controlling the size of the pores, making them «larger than water molecules, but smaller than everything else,» O'Hern says — whether salt, impurities, or particular kinds of biochemical molecules.

«We have shown that we can make graphene membranes and that we can pass DNA through them, a proof - of - concept for graphene nanopores,» Drndić said.

In this experiment, Drndić and her colleagues worked with a different material — silicon nitride — rather than attempting to craft single - atom - thick graphene membranes for nanopores.

A single layer of carbon atoms in a hexagonal lattice, graphene membranes can be made a little as about 0.5 nanometers thick but have their own disadvantages to be addressed.

However, this new discovery makes it possible to safely mass - produce graphene and graphene membranes to improve a host of products, from fuel cells to solar cells to supercapacitors and sensors.

Scanning electron microscopy images for showing sugar blowing process: glucose were polymerized and blown by released ammonia into melanoidin bubbles in heating, which bubbles were finally converted into strutted graphene containing mono - / few - layered graphene membranes and graphitic struts.

«Playing the nanodrum: Nonlinear effects in graphene membranes can be used for next - generation ICT.»

Like drums in regular drumsets, graphene membranes at the nanoscale possess a distinct set of oscillating modes that correspond to specific oscillation frequencies.

The Manchester - based group has now further developed these graphene membranes and found a strategy to avoid the swelling of the membrane when exposed to water.

The researchers performed diffusion tests with the graphene membranes, flowing a solution of water, salts, and other molecules across each membrane.

Their performance was comparable to graphene membranes made using conventional, small - batch approaches.

Researchers, including Karnik's group, have developed techniques to fabricate graphene membranes and precisely riddle them with tiny holes, or nanopores, the size of which can be tailored to filter out specific molecules.

The experimental method uses graphene, and researchers at MIT have managed to create a super-thin graphene membrane just one atom thick, which they say will make reverse osmosis easier, less energy - intensive, and cheaper.

In a study published in Nature Nanotechnology, researchers from Cornell University and the University of Jyväskylä, working with funding from the Academy of Finland, show that by applying an appropriate external force, a circular graphene membrane can be «played» like a drumset.

«Non-flammable graphene membrane developed for safe mass production.»

For the intrinsic defects, the researchers used a process called «atomic layer deposition,» placing the graphene membrane in a vacuum chamber, then pulsing in a hafnium - containing chemical that does not normally interact with graphene.

In experiments, the researchers pumped water through a graphene membrane treated with both defect - sealing and pore - producing processes, and found that water flowed through at rates comparable to current desalination membranes.

One can produce a large graphene membrane first, not worrying about the defects, which can be sealed later.»

A graphene membrane is a sheet of carbon atoms that is literally one atom thick, yet can be a completely impenetrable barrier.

Not exact matches

Rahul Raveendran - Nair, for example, is developing graphene - based membranes.

A few years ago, his lab made graphene oxide — a functional form of graphene — and fabricated it into a multilayer, micrometer - thick, paper - like membrane.

«For several years, researchers have thought of graphene as a potential route to ultrathin membranes,» says John Hart, associate professor of mechanical engineering and director of the Laboratory for Manufacturing and Productivity at MIT.

Graphene - based membranes have mostly been made in small batches in the laboratory, where researchers can carefully control the material's growth conditions.

«Scalable manufacturing process spools out strips of graphene for use in ultrathin membranes.»

«So you etch copper out from underneath and have graphene directly supported by a porous polymer — which is basically a membrane.»

«The system gives you a great degree of flexibility in terms of what you'd like to tune graphene for, all the way from electronic to membrane applications,» Kidambi says.

A new manufacturing process produces strips of graphene, at large scale, for use in membrane technologies and other applications.

For many researchers, graphene is ideal for use in filtration membranes.

The researchers set out to build an end - to - end, start - to - finish manufacturing process to make membrane - quality graphene.

«We believe this is the first study that has tailored the manufacturing of graphene toward membrane applications, which require the graphene to be seamless, cover the substrate fully, and be of high quality.»

This allows the tiny capillaries of the graphene - oxide membranes to block the salt from flowing along with the water.

Previously graphene - oxide membranes have shown exciting potential for gas separation and water filtration.

We also demonstrate that there are realistic possibilities to scale up the described approach and mass produce graphene - based membranes with required sieve sizes.»

Graphene - oxide membranes have attracted considerable attention as promising candidates for new filtration technologies.

Previous research at The University of Manchester found that if immersed in water, graphene - oxide membranes become slightly swollen and smaller salts flow through the membrane along with water, but larger ions or molecules are blocked.

It is hoped that graphene - oxide membrane systems can be built on smaller scales making this technology accessible to countries which do not have the financial infrastructure to fund large plants without compromising the yield of fresh water produced.

The international group of researchers from the Leibniz Institute Dresden (IFW), the Technische Universität Dresden, the Polish Academy of Sciences, Sungkyunkwan University and the Center for Integrated Nanostructure Physics, an Institute of Basic Science (Korea) used pores in mono - layer graphene to form free standing 2D iron (Fe) single atom thick membranes.

Dr Joshi said: «The new treatment system is made by converting naturally occurring graphite into graphene oxide membranes that allow high water flow at atmospheric pressure, while removing virtually all of the organic matter.»

«Our results indicate that graphene - based membranes could be converted into an alternative new option that could in the future be retrofitted in conventional water treatment plants.»

The researchers were able to show that the observed enlarged lattice spacing was due to strain which arises due to the lattice mismatch at the graphene edge and Fe membrane interface.

The Manchester connection is significant, not least owing to participation in the research by Irina Grigorieva, who has a special interest in molecular and particle transport across membranes formed of layered materials such as graphene.

Published in the journal Nature, the results of the study, funded in part by the Graphene Flagship, could improve our understanding of water transport through nanometre - scale channels in natural and artificial membranes.

Using metal ions with three or more positive charges, researchers in Tian's laboratory bonded graphene - oxide flakes into a transparent membrane.

And while their membrane is thicker, about 5 nanometers, silicon nitride pores can also approach graphene in terms of thinness due to the way they are manufactured.

To get solid - state nanopores and membranes in these tiny proportions, researchers, including Drndić's group, are investigating cutting - edge materials, such as graphene.

Something that interests me a lot is the use of graphene as a 2 - D membrane.

A cell - membrane - like material would have advantages over other thin materials such as graphene.

April 20, 2018 - MIT engineers develop reel - to - reel technique for making graphene film, which could be particularly useful for making filtration membranes.

Of all the many potential applications for the single - atom - thick form of carbon, graphene, filtration membranes......