Cleaning up electromagnetic pollution by containing the emissions with a thin coating of a nanomaterial called MXene

RusНа русскомEngIn English

If you’ve ever heard your engine rev through your radio while listening to an AM station in your car, or had your television make a buzzing sound when your cell phone is near it, then you’ve experienced electromagnetic interference. This phenomenon, caused by radio waves, can originate from anything that creates, carries or uses an electric current, including television and internet cables, and, of course cell phones and computers. MXene is a nanomaterial that is both thin and light, but also has the unique ability to block and absorb electromagnetic radiation, which makes it the perfect for use as shielding in electronics devices. A group of researchers at Drexel University and the Korea Institute of Science & Technology is working on cleaning up this electromagnetic pollution by containing the emissions with a thin coating of a nanomaterial called MXene. Electromagnetic radiation is everywhere — that’s been the case since the beginning of the universe. But the proliferation of electronics in recent decades has contributed both to the volume of radiation generated on our planet and its noticeability.

“As technology evolves and electronics become lighter, faster and smaller, their electromagnetic interference increases dramatically,” said Babak Anasori, PhD, a research assistant professor in the A.J. Drexel Nanomaterials Institute, and a co-author of the paper “Electromagnetic Interference Shielding with 2D Transition Metal Carbides (MXenes),” which was recently published in the journal Science. “Internal electromagnetic noise coming from different electronic parts can have a serious effect on everyday devices such as cell phones, tablets and laptops, leading to malfunctions and overall degradation of the device.” 

These effects range from temporary monitor “fuzziness,” strange buzzing from a Bluetooth device, to a slow in processing speed of a mobile device. Shielding against electromagnetic interference typically includes encasing the interior of devices with a shroud or cage of a conductive metal like copper or aluminum, or a coating of metallic ink. And while this is effective, it also adds weight to the device and is considered a restriction on how small the device can be designed.

When combined with a polymer solution, MXene can be used as a spray coating to protect components from electromagnetic interference“In general, adequate shielding can be achieved by using thick metals, however, material consumption and weight leave them at a disadvantage for use in aerospace and telecommunication applications,” Anasori said. “Therefore, it is of great importance to achieve better protection with thinner films.”

Their findings suggest that a few-atoms thin titanium carbide, one of about 20 two-dimensional materials in the MXene family discovered by Drexel University scientists, can be more effective at blocking and containing electromagnetic interference, with the added benefit of being extremely thin and easily applied in a coating just by spraying it onto any surface — like paint.

“With technology advancing so fast, we expect smart devices to have more capabilities and become smaller every day. This means packing more electronic parts in one device and more devices surrounding us,” said Yury Gogotsi, PhD, Distinguished University and Trustee Chair professor in the College of Engineering and Director of the A.J. Nanomaterials Institute who proposed the idea and led this research. “To have all these electronic components working without interfering with each other, we need shields that are thin, light and easy to apply to devices of different shapes and sizes. We believe MXenes are going to be the next generation of shielding materials for portable, flexible and wearable electronics.”

Current electromagnetic shielding materials add a considerable amount of weight and volume to mobile devices. This could be eliminated by using a thin coating of MXene to protect individual components.

Researchers in Drexel's Department of Materials Science and Engineering tested samples of MXene films ranging in thickness from just a couple micrometers (one-thousandth of a millimeter) up to 45 micrometers, which is slightly thinner than a human hair. This is significant because a material’s shielding effectiveness, a measure of a material’s ability to block electromagnetic radiation from passing through it, tends to increase with its thickness, and for purposes of this research the team was trying to identify the thinnest iteration of a shielding material that could still effectively block the radiation.

What they found is that the thinnest film of MXene is competing with copper and aluminum foils when it comes to shielding effectiveness. And by increasing thickness of the MXene to 8 micrometers, they could achieve 99.9999 percent blockage of radiation with frequencies covering the range from cell phones to radars.

In comparison to other synthetic materials, such as graphene or carbon fibers, the thin sample of MXene performed much better. In fact, to achieve commercial electromagnetic shielding requirements, currently used carbon-polymer composites would have to be more than one millimeter thick, which would add quite a bit of heft to a device like an iPhone, that is just seven millimeters thick.

MXene is able to ward off electromagnetic interference by absorbing and trapping the radiation between its layers.The key to MXene’s performance lies in its high electrical conductivity and two-dimensional structure. According to the authors, when electromagnetic waves come in contact with MXene, some are immediately reflected from its surface, while others pass through the surface but they lose energy amidst the material’s atomically thin layers. The lower energy electromagnetic waves are eventually reflected back and forth off the internal layers until they’re completely absorbed in the structure.

One other result, that already portends MXene’s usefulness in protecting wearable devices, is that its shielding effectiveness is just as stout when it is combined with a polymer to make a composite coating. And, on weight basis, it even outperforms pure copper.

“This finding is significant since several commercial requirements for an electromagnetic interference shield product are engrained in a single material,” Gogotsi said. “MXene displays many of these characteristics, including high shielding effectiveness, low density, small thickness, high flexibility and simple processing. So it is an excellent candidate for use in numerous applications.”

This technological development resulted from a fundamental study of MXene properties, which was funded by the National Science Foundation. The next step for the research team will be to find support for a broader study on other MXenes, selecting the best shielding material and testing it in devices.

Source: http://drexel.edu/now/archive/2016/September/MXene-EMI

 

 

 

News from MRC.ORG.UA

Congrats to professor Yury Gogotsi on winning the 2017 Changbai Mountain Friendship Award

Receiving a Changbai Mountain Friendship Award from the vice-governor of Jilin Province at the National Day foreign experts reception.Professor Yury Gogotsi from Drexel University, USA, received the 2017 Changbai Mountain Friendship Award from the vice-governor of Jilin Province at the National Day foreign experts reception.

 
Congarstulations to professor Yury Gogotsi from Drexel University, USA, who has won the 2017 Energy Storage Materials Award

yury gogotsiCongarstulations to professor Yury Gogotsi from Drexel University, USA, who has won the 2017 Energy Storage Materials Award,and is awarded by Energy Storage Materials journal.

 
Partial breaking of the Coulombic ordering of ionic liquids confined in carbon nanopores

An international team of researchers, including Drexel's Yury Gogotsi, PhD, observed that ions will forgo their typical alternating charge ordering when they are forced to jam into a small, sub-nanometer-sized, space — a behavior modification not unlike people relinquishing personal space in order to pack into a crowded subway car. The discovery could lead to safer energy storage devices and better water filtration membranes.In their most recent paper in Nature Materials researcher from Drexel University led by prof. Yury Gogotsi showed that Coulombic ordering reduces when the pores can accommodate only a single layer of ions. The non-Coulombic ordering is further enhanced in the presence of an applied electric potential. 

 
Researcers from Drexel University have developed a recipe that can turn electrolyte solution into a safeguard against the chemical process that leads to battery-related disasters

Recipe for Safer Batteries — Just Add DiamondsResearchers described a process by which nanodiamonds — tiny diamond particles 10,000 times smaller than the diameter of a hair — curtail the electrochemical deposition, called plating, that can lead to hazardous short-circuiting of lithium ion batteries.

 
Triangle Talks with Yury Gogotsi

alt

Yury Gogotsi is a researcher in the Drexel University Nanomaterials Group. He and his colleagues discovered a series of novel materials known as MXenes. 

 
Yury Gogotsi is the most influential scientist of modern Ukraine

altThe life of Yury Gogotsi is a constant back and forth between the top laboratories in the world, writing articles in the best scientific journals and research materials that can change the world around them. 

 
Professor Yury Gogotsi , Drexel University, USA, received an Honorary Doctorate from Frantsevich Institute for Problems of Materials Science, National Academy of Science of Ukraine, Kiev, Ukraine, June 20, 2017.

Deputy Directors of IPMS NAS professors Dr. Ragulya, Dr. Baglyuk, Mr. Zavorotnyi, Honorary Professor of IPMS NASU Yury Gogotsi,  Scientific Secretary Dr. Kartuzov and Dr. Firstov Professor Yury Gogotsi , Drexel University, USA,  received an Honorary Doctorate from Frantsevich Institute for Problems of Materials Science, National Academy of Science of Ukraine.

 
Professor Yury Gogotsi was speaking about nanotechnology in energy storage at the World Science Festival 2017

Professor Yury Gogotsi at World Science Festival 2017Join world-class nanoscientists and environmental leaders to explore how the capacity to harness molecules and atoms is accelerating spectacular inventions — including light-weight “wonder materials,” vital energy-storage technologies, and new sources of renewable energy — which promise to redefine the very future of energy.

 
MXenes are at the forefront of 2D materials research

alt

Research of 2D MXenes is prominently featured in an article in Chemical & Engineering News - bulletin of the American Chemical Society that goes in hard copy to more than 150,000 subscribers. No doubt, MXenes are at the forefront of 2D materials research.

 
IDEATION Seminars: A New Platform for Innovation Management, Promotion, Licensing, Technology Transfer and Commercialization, June 7 at 14:30, KPI, Kyiv

altSpeakers:  Victor Korsun and Douglas Graham

 
Nano Iguana became a 1st place winner at 2017 MRS Science as Art Competition

Entry Nano Iguana became a 1st place winner at Science as Art Competition 2017: Nano-anatase (TiO2) crystals decorating graphene-like carbon, fabricated by oxidizing 2d Ti3C2 MXene powder, presented by A. J. Drexel Nanotechnology Institute and Department of Materials Science  and Engineering, Drexel University, USAResearch team from Drexel University lead by professor Yury Gogotsi produced an award-wining entry and became the 1st place winner in Science as Art competition at 2017 MRS Spring meeting in Phoenix.

 
1st Africa Energy Materials conference, 28 – 31 March 2017, Pretoria, South Africa

1st Africa Energy Materials conference On the first day of the conference, on March 28, the conference participants had an opportunity to attend a plenary lecture "Two-Dimensional Materials for High Rate and High-energy Density Storage" by invited plenary speaker professor Yury Gogotsi, Distinguished University Professor and Trustee Chair of Materials Science and Engineering at Drexel University, and Director of the A.J. Drexel Nanomaterials Institute 

 
Workshop “Nanomaterials – based innovative engineering solution to ensure sustainable safeguard to indoor air “ NANOGUARD2AR 27-28 February, Lisbon, Portugal

altThe goal of the workshop is to attract the most recognized academic experts in the field of Innovative Nanomaterials for Environmental Application to share their knowledge and expertise on nanomaterials, nanoengineering and green building concepts.

 
MATERIAL WITNESSES — RESEARCHERS AROUND THE WORLD ARE DELVING INTO DREXEL’S 2D MXENE

Researchers from the A.J. Drexel Nanomaterials Institute have been studying MXene for nearly half a decade. (L-R): Olekisy Gogotsi (Director of Materials Research Center, Ukraine), Gabriel Scull, Babak Anasori, Mohamed Alhabeb, Yury Gogotsi.

More than twenty 2D carbides, nitrides and carbonitrides of transition metals (MXenes) have been synthesized and studied, and dozens more predicted to exist. Highly electrically conductive MXenes show promise in electrical energy storage, electromagnetic interference shielding, electrocatalysis, plasmonics and other applications.

 
Prof. Gogotsi has been included in the list of ISI Highly Cited researchers for the 3rd year in the row

altProf. Gogotsi has been named among Highly Cited Researchers 2016, representing worlds most influential scientific minds