This venture into brain-like (neuromorphic) computing comes from France according to an August 17, 2021 news item on Nanowerk (Note: A link has been removed),
Brain-inspired electronics are the subject of intense research. Scientists from CNRS (Centre national de la recherche scientifique; French National Centre for Scientific Research) and the Ecole Normale Supérieure – PSL have theorized how to develop artificial neurons using, as nerve cells, ions to carry the information.
Their work, published in Science (“Modeling of emergent memory and voltage spiking in ionic transport through angstrom-scale slits”), reports that devices made of a single layer of water transporting ions within graphene nanoslits have the same transmission capacity as a neuron.
Au August 16, 2021 CNRS press release (also on EurekAlert but published August 6, 2021), which originated the news item, provides insight into the international interest in neuromorphic computing along with a few technical details about this latest research,
With an energy consumption equivalent to two bananas per day, the human brain can perform many complex tasks. Its high energy efficiency depends in particular on its base unit, the neuron, which has a membrane with nanometric pores called ion channels, which open and close according to the stimuli received. The resulting ion flows create an electric current responsible for the emission of action potentials, signals that allow neurons to communicate with each other.
Artificial intelligence can do all of these tasks but only at the cost of energy consumption tens of thousands of times that of the human brain. So the entire research challenge today is to design electronic systems that are as energy efficient as the human brain, for example, by using ions, not electrons, to carry the information. For this, nanofluidics, the study of how fluids behave in channels less than 100 nanometers wide, offer many perspectives. In a new study, a team from the ENS Laboratoire de Physique (CNRS/ENS-PSL/Sorbonne Université/Université de Paris) shows how to construct a prototype of an artificial neuron formed of extremely thin graphene slits containing a single layer of water molecules1. The scientists have shown that, under the effect of an electric field, the ions from this layer of water assemble into elongated clusters and develop a property known as the memristor effect: these clusters retain some of the stimuli that have been received in the past. To repeat the comparison with the brain, the graphene slits reproduce the ion channels, clusters and ion flows. And, using theoretical and digital tools, scientists have shown how to assemble these clusters to reproduce the physical mechanism of emission of action potentials, and thus the transmission of information.
This theoretical work continues experimentally within the French team, in collaboration with scientists from the University of Manchester (UK). The goal now is to prove experimentally that such systems can implement simple learning algorithms that can serve as the basis for tomorrow’s electronic memories.
1 Recently invented in Manchester by the group of André Geim (Nobel Prize in Physics 2010)
My June 21, 2018 posting was the last time these graphene-enhanced sports shoes/sneakers/running shoes/runners/trainers were mentioned here (it was also the first time). The latest version features newly graphene-enhanced shoe soles that last twice as long as the industry standard according to a March 30, 2021 article by Robert Lea for Azonano (Note: A link has been removed),
Thanks to researchers at the University of Manchester and UK-based sportswear manufacturer Inov-8, graphene can now be found at the tips of your toes as well as your fingers.
In 2017 Inov-8 brought to the market the first running shoe that utilizes graphene in its grips, and 4 years later the manufacturer is still innovating, offering a wide range of products that rely on the wonder material.
Now, as well as finding its way into the grips of the company’s running shoes, graphene is also found in the soles of the company’s latest long-distance running shoe too¹.
Using graphene as part of the cushioning insole in trail running shoes has led to a shoe that lasts twice as long as leading competitors’ footwear, the company says.
When Inov-8 began their quest to use graphene to improve running shoes, the initial goal was to employ the material to create improved rubber grips that would not wear down as quickly as other running shoes and retain grip for longer during this slower wearing process.
The company teamed with the University of Manchester to make this goal a reality, …
The graphene-enhanced grip proved such a hit with consumers that in the four years since its induction, shoes featuring the outer-sole now account for 50% of overall sales.
Building upon the success of Inov-8’s graphene gripped running shoe, the company has expanded its use of the material to a midsole foam. The graphene replaces EVA foam plates of carbon which are traditionally used in this form of long-distance running shoe.
Sports footwear firm inov-8 has unveiled the world’s first running shoe to use a graphene-enhanced foam in the sole, bucking the widespread trend for carbon-plate technology and doubling the industry standard for longevity.
Developed in collaboration with graphene experts at The University of Manchester, the cushioned foam, called G-FLY™, features as part of inov-8’s new trail shoe, the TRAILFLY ULTRA G 300 MAX™, designed for ultramarathon and long-distance runners.
Tests have shown the foam delivers 25% greater energy return than standard EVA foams and is far more resistant to compressive wear. It therefore maintains optimum levels of underfoot bounce and comfort for much longer.
This helps runners maintain a faster speed over greater distances, aid their feet in feeling fresher for longer, and prolong the life of their footwear.
Michael Price, COO of Lake District-based inov-8, said: …
“We’ve worked incredibly hard for the past two years with the university and leading footwear industry veteran Doug Sheridan in developing this innovation. A team of 40 athletes from across the world tested prototype shoes and more than 50 mixes of graphene-enhanced foam. Trail test reports show G-FLY foam still performing well after 1,200km – double the industry standard.”
Dr Aravind Vijayaraghavan, Reader in Nanomaterials at the University, home to both the National Graphene Institute and Graphene Engineering Innovation Centre, said: “As well as on the trail, we also tested extensively in the laboratory, including subjecting the foam to aggressive ageing tests that mimic extensive use. Despite being significantly aged, the G-FLY foam still delivered more energy return than some unaged foams.
This research suggests that graphene flakes might have an impact on anxiety-related behaviour. If I read the work correctly, the graphene flakes don’t exacerbate anxiety but, instead, may provide relief.
A March 10, 2021 news item on phys.org announces the research into graphene flakes and neurons (rat), Note: Links have been removed,
Effective, specific, with a reversible and non-harmful action: the identikit of the perfect biomaterial seems to correspond to graphene flakes, the subject of a new study carried out by SISSA—International School for Advanced Studies of Trieste, Catalan Institute of Nanoscience and Nanotechnology (ICN2) of Barcelona, and the National Graphene Institute of the University of Manchester, as part of the European Graphene Flagship project. This nanomaterial has demonstrated the ability to interact with the functions of the nervous system in vertebrates in a very specific manner, interrupting the building up of a pathological process that leads to anxiety-related behavior.
“We previously showed that when graphene flakes are delivered to neurons they interfere spontaneously with excitatory synapses by transiently preventing glutamate release from presynaptic terminals,” says Laura Ballerini of SISSA, the leader of the team that carried out the research study “Graphene oxide prevents lateral amygdala dysfunctional synaptic plasticity and reverts long lasting anxiety behavior in rats,” recently published in Biomaterials.
“We investigated whether such a reduction in synaptic activity was sufficient to modify related behaviours, in particular the pathological ones that develop due to a transient and localised hyper-function of excitatory synapses”. This approach would fortify the strategy of selective and transient targeting of synapses to prevent the development of brain pathologies by using the so-called precise medicine treatments.
To test this hypothesis, the team focused on post-traumatic stress disorder (PTSD) and carried out the experiments in two phases, in vivo and in vitro.
“We analysed defensive behaviours caused in rats [emphasis mine] by the presence of a predator, using the exposure to cat odour, to induce an aversive memory” explains Audrey Franceschi Biagioni of SISSA, the first author of the study. “If exposed to the predator odour, the rat has a defensive response, holing up, and this experience is so well-imprinted in the memory, that when the animal is placed in the same context even six days later, the animal remembers the odour of the predator and acts the same protective behaviour. This is a well-known and consolidated model, that we used to reproduce a stress behaviour. Exposure to the predator can modify neuronal connections – a phenomenon that is technically known as plasticity – and increases synaptic activity in a specific area of the amygdala that therefore represented the target of our study to test the effects of the nanomaterial”.
Laura Ballerini adds: “We hypothesised that graphene flakes that we showed to temporarily inhibit excitatory synapses (without causing inflammation, damage to neurons or other side effects) could be injected in the lateral amygdala when the plasticity associated with memory was consolidated. If the nanomaterial was efficient in blocking excitatory synapses, it should inhibit plasticity and decrease the anxiety related response. And this is what happened: the animals that were administered with graphene flakes, after six days, “forgot” the anxiety related responses, rescuing their behaviour”.
The second part of the research was performed in vitro. “In vivo we could observe only behavioural changes and could not evaluate the impact of the graphene flakes on synapses,” explains Giada Cellot, researcher at SISSA and first author of the study together with Audrey Franceschi Biagioni. “In vitro experiments allowed to work on a simplified model, to get insight about the mechanisms through which the graphene flakes can interact with neurons. We used neuronal cultures obtained from the amygdala, the region of the brain where the stress response occurs, and we observed that the effects of nanomaterials were specific for the excitatory synapses and a short exposure to graphene flakes could prevent the pathological plasticity of the synapses”.
Thanks to these findings, graphene flakes have shown their potential as nanotools (biomedical tools composed of nanomaterials) that could act in a specific and reversible way on synaptic activity to interrupt a pathological process and therefore they might be used also to transport drugs or for other applications in the field of precision medicine.
Yes, it’s a ‘Top Gun’ movie quote (1986) or more accurately, a paraphrasing of Tom Cruise’s line “I feel the need for speed.” I understand there’s a sequel, which is due to arrive in movie theatres or elsewhere at sometime in this decade.
Where wireless and WiFi are concerned I think there is a dog/poodle situation. ‘Dog’ is a general description where ‘poodle’ is a specific description. All poodles (specific) are dogs (general) but not all dogs are poodles. So, wireless is a general description and Wi-Fi is a specific type of wireless communication. All WiFi is wireless but not all wireless is Wi-Fi. That said, onto the research.
Given what seems to be an insatiable desire for speed in the wireless world, the quote seems quite à propos in relation to the latest work on quantum tunneling and its impact on Wi-Fi speed from the Moscow Institute of Physics and Technology (from a February 3, 2021 news item on phys.org,
Scientists from MIPT (Moscow Institute of Physics and Technology), Moscow Pedagogical State University and the University of Manchester have created a highly sensitive terahertz detector based on the effect of quantum-mechanical tunneling in graphene. The sensitivity of the device is already superior to commercially available analogs based on semiconductors and superconductors, which opens up prospects for applications of the graphene detector in wireless communications, security systems, radio astronomy, and medical diagnostics. The research results are published in Nature Communications.
Information transfer in wireless networks is based on transformation of a high-frequency continuous electromagnetic wave into a discrete sequence of bits. This technique is known as signal modulation. To transfer the bits faster, one has to increase the modulation frequency. However, this requires synchronous increase in carrier frequency. A common FM-radio transmits at frequencies of hundred megahertz, a Wi-Fi receiver uses signals of roughly five gigahertz frequency, while the 5G mobile networks can transmit up to 20 gigahertz signals. This is far from the limit, and further increase in carrier frequency admits a proportional increase in data transfer rates. Unfortunately, picking up signals with hundred gigahertz frequencies and higher is an increasingly challenging problem.
A typical receiver used in wireless communications consists of a transistor-based amplifier of weak signals and a demodulator that rectifies the sequence of bits from the modulated signal. This scheme originated in the age of radio and television, and becomes inefficient at frequencies of hundreds of gigahertz desirable for mobile systems. The fact is that most of the existing transistors aren’t fast enough to recharge at such a high frequency.
An evolutionary way to solve this problem is just to increase the maximum operation frequency of a transistor. Most specialists in the area of nanoelectronics work hard in this direction. A revolutionary way to solve the problem was theoretically proposed in the beginning of 1990’s by physicists Michael Dyakonov and Michael Shur, and realized, among others, by the group of authors in 2018. It implies abandoning active amplification by transistor, and abandoning a separate demodulator. What’s left in the circuit is a single transistor, but its role is now different. It transforms a modulated signal into bit sequence or voice signal by itself, due to non-linear relation between its current and voltage drop.
In the present work, the authors have proved that the detection of a terahertz signal is very efficient in the so-called tunneling field-effect transistor. To understand its work, one can just recall the principle of an electromechanical relay, where the passage of current through control contacts leads to a mechanical connection between two conductors and, hence, to the emergence of current. In a tunneling transistor, applying voltage to the control contact (termed as ”gate”) leads to alignment of the energy levels of the source and channel. This also leads to the flow of current. A distinctive feature of a tunneling transistor is its very strong sensitivity to control voltage. Even a small “detuning” of energy levels is enough to interrupt the subtle process of quantum mechanical tunneling. Similarly, a small voltage at the control gate is able to “connect” the levels and initiate the tunneling current
“The idea of ??a strong reaction of a tunneling transistor to low voltages is known for about fifteen years,” says Dr. Dmitry Svintsov, one of the authors of the study, head of the laboratory for optoelectronics of two-dimensional materials at the MIPT center for photonics and 2D materials. “But it’s been known only in the community of low-power electronics. No one realized before us that the same property of a tunneling transistor can be applied in the technology of terahertz detectors. Georgy Alymov (co-author of the study) and I were lucky to work in both areas. We realized then: if the transistor is opened and closed at a low power of the control signal, then it should also be good in picking up weak signals from the ambient surrounding. “
The created device is based on bilayer graphene, a unique material in which the position of energy levels (more strictly, the band structure) can be controlled using an electric voltage. This allowed the authors to switch between classical transport and quantum tunneling transport within a single device, with just a change in the polarities of the voltage at the control contacts. This possibility is of extreme importance for an accurate comparison of the detecting ability of a classical and quantum tunneling transistor.
The experiment showed that the sensitivity of the device in the tunnelling mode is few orders of magnitude higher than that in the classical transport mode. The minimum signal distinguishable by the detector against the noisy background already competes with that of commercially available superconducting and semiconductor bolometers. However, this is not the limit – the sensitivity of the detector can be further increased in “cleaner” devices with a low concentration of residual impurities. The developed detection theory, tested by the experiment, shows that the sensitivity of the “optimal” detector can be a hundred times higher.
“The current characteristics give rise to great hopes for the creation of fast and sensitive detectors for wireless communications,” says the author of the work, Dr. Denis Bandurin. And this area is not limited to graphene and is not limited to tunnel transistors. We expect that, with the same success, a remarkable detector can be created, for example, based on an electrically controlled phase transition. Graphene turned out to be just a good launching pad here, just a door, behind which is a whole world of exciting new research.”
The results presented in this paper are an example of a successful collaboration between several research groups. The authors note that it is this format of work that allows them to obtain world-class scientific results. For example, earlier, the same team of scientists demonstrated how waves in the electron sea of ??graphene can contribute to the development of terahertz technology. “In an era of rapidly evolving technology, it is becoming increasingly difficult to achieve competitive results.” – comments Dr. Georgy Fedorov, deputy head of the nanocarbon materials laboratory, MIPT, – “Only by combining the efforts and expertise of several groups can we successfully realize the most difficult tasks and achieve the most ambitious goals, which we will continue to do.”
Here’s a link to and a citation for the latest paper,
Tunnel field-effect transistors for sensitive terahertz detection by I. Gayduchenko, S. G. Xu, G. Alymov, M. Moskotin, I. Tretyakov, T. Taniguchi, K. Watanabe, G. Goltsman, A. K. Geim, G. Fedorov, D. Svintsov & D. A. Bandurin. Nature Communications volume 12, Article number: 543 (2021) DOI: https://doi.org/10.1038/s41467-020-20721-z Published: 22 January 2021
This paper is open access.
One last comment, I’m assuming since the University of Manchester is mentioned that A. K. Geim is Sir Andre K. Geim (you can look him up here is you’re not familiar with his role in the graphene research community).
The 1979 book, Laboratory Life: the Social Construction of Scientific Facts by Bruno Latour and Steve Woolgar immediately came to mind on reading about a new book (The New Architecture of Science: Learning from Graphene) linking architecture to the practice of science (research on graphene). It turns out that one of the authors studied with Latour. (For more about Laboratory Life* see: Bruno Latour’s Wikipedia entry; scroll down to Main Works)
How does the architecture of scientific buildings matter for science? How does the design of specific spaces such as laboratories, gas rooms, transportation roots, atria, meeting spaces, clean rooms, utilities blocks and mechanical workshops affect how scientists think, conduct experiments, interact and collaborate? What does it mean to design a science lab today? What are the new challenges for the architects of science buildings? And what is the best method to study the constantly evolving architectures of science?
Over the past four decades, the design of lab buildings has drawn the attention of scholars from different disciplines. Yet, existing research tends to focus either purely on the technical side of lab design or on the human interface and communication aspects.
To grasp the specificity of the new generation of scientific buildings, however, a more refined gaze is needed: one that accounts simultaneously for the complex technical infrastructure and the variability of human experience that it facilitates.
Weaving together two tales of the NGI [National Graphene Institute] building in Manchester, lead scientist and one of the designers, Kostya [or Konstantin] Novoselov, and architectural anthropologist, Albena Yaneva, combine an analysis of its distinctive design features with ethnographic observation of the practices of scientists, facility managers, technicians, administrators and house service staff in The New Architecture of Science: Learning from Graphene.
Drawing on a meticulous study of ‘the social life’ of the building, the book offers a fresh account of the mutual shaping of architecture and science at the intersection of scientific studies, cognitive anthropology and architectural theory. By bringing the voices of the scientist as a client and the architectural theorist into a dual narrative, The New Architecture of Science presents novel insights on the new generation of science buildings.
Glimpses into aspects of the ‘life’ of a scientific building and the complex sociotechnical and collective processes of design and dwelling, as well as into the practices of nanoscientists, will fascinate a larger audience of students across the fields of Architecture, Public Communication of Science, Science and Technology Studies, Physics, Material Science, Chemistry.
The volume is expected to appeal to academic faculty members looking for ways to teach architecture beyond authorship and seeking instead to develop a more comprehensive perspective of the built environment in its complexity of material and social meanings. The book can thus be used for undergraduate and post-graduate course syllabi on the theory of architecture, design and urban studies, science and technology studies, and science communication. It will be a valuable guidebook for innovative studio projects and an inspirational reading for live project courses.
In addition to occasioning a book, the building has also garnered an engineering award for Jestico + Whiles according to a page dedicated to the UK’s National Institute of Graphene on theplan.it website. Whoever wrote this did an excellent job of reviewing the history of graphene and its relation to the University of Manchester and provides considerable insight into the thinking behind the design and construction of this building,
The RIBA [Royal Institute of British Architects] award-winning National Graphene Institute (NGI) is a world-leading research and incubator centre dedicated to the development of graphene. Located in Manchester, it is an essential component in the UK’s bid to remain at the forefront of the commercialisation of this pioneering and revolutionary material.
Jestico + Whiles was appointed lead architect of the new National Graphene Institute at the University of Manchester in 2012, working closely with Sir Kostya Novoselov – who, along with Sir Andre Geim, first isolated graphene at the University of Manchester in 2004. The two were jointly awarded the Nobel Prize in Physics in 2010. [emphases mine]
Located in the university campus’ science quarter, the institute is housed in a compact 7,600m2 five-storey building, with the main cleanroom located on the lower ground floor to achieve best vibration performance. The ceiling of the viewing corridor that wraps around the cleanroom is cleverly angled so that scientists in the basement are visible to the public from street level.
On the insistence of Professor Novoselov most of the laboratories, including the cleanrooms, have natural daylight and view, to ensure that the intense work schedules do not deprive researchers of awareness and enjoyment of external conditions. All offices are naturally ventilated with openable windows controlled by occupants. Offices and labs on all floors are intermixed to create flexible and autonomous working zones which are easily changed and adapted to suit emerging new directions of research and changing team structures, including invited industry collaborators.
The building also provides generous collaborative and breakout spaces for meetings, relaxation and social interaction, including a double height roof-lit atrium and a top-floor multifunction seminar room/café that opens onto a south facing roof terrace with a biodiverse garden. A special design feature that has been incorporated to promote and facilitate informal exchanges of ideas is the full-height ‘writable’ walls along the corridors – a black PVC cladding that functions like traditional blackboards but obviates the health and safety issue of chalk dust.
The appearance and imagery of this building was of high importance to the client, who recognised the significant impact a cutting-edge research facility for such a potentially world-changing material could bring to the university. Nobel laureate end users, heads of departments, the Estates Directorate, and different members of the design and project team all made contributions to deciding what this was. Speaking in an article in the New Yorker, fellow graphene researcher James Tour of Rice University, Texas said ‘What Andre Geim and Kostya Novoselov did was to show the world the amazingness of graphene.’ Our design sought to convey this ‘amazingness’ through the imagery and materiality of the NGI.
The material chosen for the outer veil is a black Rimex stainless steel, which has the quality of mirror-like reflectivity, but infinitely varies in colour depending on light conditions and the angle of the view. The resulting image is that of a mysterious, ever-changing mirage that evokes the universal experience of scientific exploration. An exploration enveloped by a 2D, ultra-thin, black material that has a mercurial, undefinable character – a perfect visual reference for graphene.
This mystery is deepened by subtle delineation of the equations used in graphene research all over the façade through perforations in the panels. These are intentionally obscure and only apparent upon inspection. The equations include two hidden deliberate mistakes set by Professor Novoselov.
The perforations themselves are hexagonal in shape, representing the 2D atomic formation of graphene. They are laser cut based on a completely regular orthogonal grid, with only the variations in the size of each hole making the pattern of the letters and symbols of the equations. We believe this is a unique design in using parametric design tools to generate organic and random looking patterns out of a completely regular grid.
Who are Albena Yaneva and Sir Konstantin (Kostya) Sergeevich Novoselov?
After a PhD in Sociology and Anthropology from Ecole Nationale Supérieure des mines de Paris (2001) with Professor Bruno Latour, Yaneva has worked at Harvard University, the Max-Planck Institite for the History of Science in Berlin and the Austrian Academy of Science in Vienna. Her research is intrinsically transdisciplinary and spans the boundaries of science studies, cognitive anthropology, architectural theory and political philosophy. Her work has been translated in German, Italian, Spanish, Portuguese, French, Thai, Polish, Turkish and Japanese.
Her book The Making of a Building: A Pragmatist Approach to Architecture (Oxford: Peter Lang, 2009) provides a unique anthropological account of architecture in the making, whereas Made by the OMA: An Ethnography of Design (Rotterdam: 010 Publishers, 2009) draws on an original approach of ethnography of design and was defined by the critics as “revolutionary in analyzing the day-to-day practice of designers.” For her innovative use of ethnography in the architectural discourses Yaneva was awarded the RIBA President’s Award for Outstanding University-located Research (2010).
Yaneva’s book Mapping Controversies in Architecture (Routledge, 2012) brought the newest developments in social sciences into architectural theory. It introduced Mapping Controversies as a research and teaching methodology for following design debates. A recent volume in collaboration with Alejandro Zaera-Polo What is Cosmopolitical Design? (Routledge, 2015) questioned the role of architectural design at the time of the Anthropocene and provided many examples of cosmopolitically correct design.
Her monograph Five Ways to Make Architecture Political. An Introduction to the Politics of Design Practice (Bloomsbury, 2017) takes inspiration from object-oriented political thought and engages in an informed enquiry into the different ways architectural design can be political. The study contributes to a better understanding of the political outreach of the engagement of designers with their publics.
Professor Yaneva’s monograph Crafting History: Archiving and the Quest for ArchitecturalLegacy (Cornell University Press, 2020) explores the daily practices of archiving in its mundane and practical course and is based on ethnographic observation of the Canadian Centre for Architecture (CCA) [emphasis mine] in Montreal, a leading archival institution, and interviews with a range of practitioners around the world, including Álvaro Siza and Peter Eisenman. Unravelling the multiple epistemic dimensions of archiving, the book tells a powerful story about how collections form the basis of Architectural History.
I did not expect any Canadian content!
Oddly, I cannot find anything nearly as expansive for Novoselov on the University of Manchester website. There’s this rather concise faculty webpage and this more fulsome biography on the National Graphene Institute website. For the record, he’s a physicist.
Novoselov is known for his interest in art. He practices in Chinese traditional drawing and has been involved in several projects on modern art. Thus, in February 2015 he combined forces with Cornelia Parker to create a display for the opening of the Whitworth Art Gallery. Cornelia Parker’s meteorite shower firework (pieces of meteorites loaded in firework) was launched by Novoselov breathing on graphene gas sensor (which changed the resistance of graphene due to doping by water vapour). Graphene was obtained through exfoliation of graphite which was extracted from a drawing of William Blake. Novoselov suggested that he also exfoliated graphite obtained from the drawings of other prominent artists: John Constable, Pablo Picasso, J. M. W. Turner, Thomas Girtin. He said that only microscopic amounts (flake size less than 100 micrometres) was extracted from each of the drawings. In 2015 he participated in “in conversation” session with Douglas Gordon during Interdependence session at Manchester International Festival.
I find some illustrations a little difficult to decipher,
I believe the red in the ‘on/off’ images, signifies heat from the surrounding environment and is not an indicator for body heat and the yellow square in the ‘on’ image indicates the shirt is working and repelling that heat.
Moving on, a June 18, 2020 news item on Nanowerk describes this latest work on a smart textile that can help regulate body temperature when it’s hot,
New research on the two-dimensional (2D) material graphene has allowed researchers to create smart adaptive clothing which can lower the body temperature of the wearer in hot climates.
A team of scientists from The University of Manchester’s National Graphene Institute have created a prototype garment to demonstrate dynamic thermal radiation control within a piece of clothing by utilising the remarkable thermal properties and flexibility of graphene. The development also opens the door to new applications such as, interactive infrared displays and covert infrared communication on textiles.
The human body radiates energy in the form of electromagnetic waves in the infrared spectrum (known as blackbody radiation). In a hot climate it is desirable to make use the full extent of the infrared radiation to lower the body temperature that can be achieved by using infrared-transparent textiles. As for the opposite case, infrared-blocking covers are ideal to minimise the energy loss from the body. Emergency blankets are a common example used to deal with treating extreme cases of body temperature fluctuation.
The collaborative team of scientists demonstrated the dynamic transition between two opposite states by electrically tuning the infrared emissivity (the ability to radiate energy) of the graphene layers integrated onto textiles.
One-atom thick graphene was first isolated and explored in 2004 at The University of Manchester. Its potential uses are vast and research has already led to leaps forward in commercial products including; batteries, mobile phones, sporting goods and automotive.
The new research published today in journal Nano Letters, demonstrates that the smart optical textile technology can change its thermal visibility. The technology uses graphene layers to control of thermal radiation from textile surfaces.
Professor Coskun Kocabas, who led the research, said: “Ability to control the thermal radiation is a key necessity for several critical applications such as temperature management of the body in excessive temperature climates. Thermal blankets are a common example used for this purpose. However, maintaining these functionalities as the surroundings heats up or cools down has been an outstanding challenge.”
Prof Kocabas added: “The successful demonstration of the modulation of optical properties on different forms of textile can leverage the ubiquitous use of fibrous architectures and enable new technologies operating in the infrared and other regions of the electromagnetic spectrum for applications including textile displays, communication, adaptive space suits, and fashion”.
This study built on the same group’s previous research using graphene to create thermal camouflage which would fool infrared cameras. The new research can also be integrated into existing mass-manufacture textile materials such as cotton. To demonstrate, the team developed a prototype product within a t-shirt allowing the wearer to project coded messages invisible to the naked eye but readable by infrared cameras.
“We believe that our results are timely showing the possibility of turning the exceptional optical properties of graphene into novel enabling technologies. The demonstrated capabilities cannot be achieved with conventional materials.”
“The next step for this area of research is to address the need for dynamic thermal management of earth-orbiting satellites. Satellites in orbit experience excesses of temperature, when they face the sun, and they freeze in the earth’s shadow. Our technology could enable dynamic thermal management of satellites by controlling the thermal radiation and regulate the satellite temperature on demand.” said Kocabas.
Professor Sir Kostya Novoselov was also involved in the research: “This is a beautiful effect, intrinsically routed in the unique band structure of graphene. It is really exciting to see that such effects give rise to the high-tech applications.” he said.
Advanced materials is one of The University of Manchester’s research beacons – examples of pioneering discoveries, interdisciplinary collaboration and cross-sector partnerships that are tackling some of the biggest questions facing the planet. #ResearchBeacons
A July 26, 2019 news item on Nanowerk takes us into the world of quantum physics and graphene (Note: Links have been removed),
A team of researchers from the Universities of Manchester, Nottingham and Loughborough have discovered quantum phenomena that helps to understand the fundamental limits of graphene electronics.
As published in Nature Communications (“Strong magnetophonon oscillations in extra-large graphene”), the work describes how electrons in a single atomically-thin sheet of graphene scatter off the vibrating carbon atoms which make up the hexagonal crystal lattice.
By applying a magnetic field perpendicular to the plane of graphene, the current-carrying electrons are forced to move in closed circular “cyclotron” orbits. In pure graphene, the only way in which an electron can escape from this orbit is by bouncing off a “phonon” in a scattering event. These phonons are particle-like bundles of energy and momentum and are the “quanta” of the sound waves associated with the vibrating carbon atom. The phonons are generated in increasing numbers when the graphene crystal is warmed up from very low temperatures.
By passing a small electrical current through the graphene sheet, the team were able to measure precisely the amount of energy and momentum that is transferred between an electron and a phonon during a scattering event.
Their experiment revealed that two types of phonon scatter the electrons: transverse acoustic (TA) phonons in which the carbon atoms vibrate perpendicular to the direction of phonon propagation and wave motion (somewhat analogous to surface waves on water) and longitudinal acoustic (LA) phonons in which the carbon atoms vibrate back and forth along the direction of the phonon and the wave motion; (this motion is somewhat analogous to the motion of sound waves through air).
The measurements provide a very accurate measure of the speed of both types of phonons, a measurement which is otherwise difficult to make for the case of a single atomic layer. An important outcome of the experiments is the discovery that TA phonon scattering dominates over LA phonon scattering.
The observed phenomena, commonly referred to as “magnetophonon oscillations”, was measured in many semiconductors years before the discovery of graphene. It is one of the oldest quantum transport phenomena that has been known for more than fifty years, predating the quantum Hall effect. Whereas graphene possesses a number of novel, exotic electronic properties, this rather fundamental phenomenon has remained hidden.
Laurence Eaves & 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.”
Their appearance requires two key ingredients. First, the team had to fabricate high quality graphene transistors with large areas at the National Graphene Institute. If the device dimensions are smaller than a few micrometres the phenomena could not be observed.
Piranavan Kumaravadivel from The University of Manchester, lead author of the paper said: “At the beginning of quantum transport experiments, people used to study macroscopic, millimetre sized crystals. In most of the work on quantum transport on graphene, the studied devices are typically only a few micrometres in size. It seems that making larger graphene devices is not only important for applications but now also for fundamental studies.”
The second ingredient is temperature. Most graphene quantum transport experiments are performed at ultra-cold temperatures in-order to slow down the vibrating carbon atoms and “freeze-out” the phonons that usually break quantum coherence. Therefore, the graphene is warmed up as the phonons need to be active to cause the effect.
Mark Greenaway, from Loughborough University, who worked on the quantum 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.”
Here’s a link to and a citation for the paper,
Strong magnetophonon oscillations in extra-large graphene by P. Kumaravadivel, M. T. Greenaway, D. Perello, A. Berdyugin, J. Birkbeck, J. Wengraf, S. Liu, J. H. Edgar, A. K. Geim, L. Eaves & R. Krishna Kumar. ature Communicationsvolume 10, Article number: 3334 (2019) DOI: https://doi.org/10.1038/s41467-019-11379-3 Published 26 July 2019
A team of scientists are seeking to kick-start a wearable technology revolution by creating flexible fibres and adding acids from red wine.
Extracting tannic acid from red wine, coffee or black tea, led a team of scientists from The University of Manchester to develop much more durable and flexible wearable devices. The addition of tannins improved mechanical properties of materials such as cotton to develop wearable sensors for rehabilitation monitoring, drastically increasing the devices lifespan.
The team have developed wearable devices such as capacitive breath sensors and artificial hands for extreme conditions by improving the durability of flexible sensors. Previously, wearable technology has been subject to fail after repeated bending and folding which can interrupt the conductivity of such devices due to tiny micro cracks. Improving this could open the door to more long-lasting integrated technology.
Dr Xuqing Liu who led the research team said: “We are using this method to develop new flexible, breathable, wearable devices. The main research objective of our group is to develop comfortable wearable devices for flexible human-machine interface.
“Traditional conductive material suffers from weak bonding to the fibers which can result in low conductivity. When red wine, or coffee, or black tea, is spilled on a dress, it’s difficult to get rid of these stains. The main reason is that they all contain tannic acid, which can firmly adsorb the material on the surface of the fiber. This good adhesion is exactly what we need for durable wearable, conductive devices.”
The new research published in the journal Small demonstrated that without this layer of tannic acid, the conductivity is several hundred times, or even thousands of times, less than traditional conductive material samples as the conductive coating becomes easily detached from the textile surface through repeated bending and flexing.
The European Union’s Human Brain Project was announced in January 2013. It, along with the Graphene Flagship, had won a multi-year competition for the extraordinary sum of one million euros each to be paid out over a 10-year period. (My January 28, 2013 posting gives the details available at the time.)
At a little more than half-way through the project period, Ed Yong, in his July 22, 2019 article for The Atlantic, offers an update (of sorts),
Ten years ago, a neuroscientist said that within a decade he could simulate a human brain. Spoiler: It didn’t happen.
On July 22, 2009, the neuroscientist Henry Markram walked onstage at the TEDGlobal conference in Oxford, England, and told the audience that he was going to simulate the human brain, in all its staggering complexity, in a computer. His goals were lofty: “It’s perhaps to understand perception, to understand reality, and perhaps to even also understand physical reality.” His timeline was ambitious: “We can do it within 10 years, and if we do succeed, we will send to TED, in 10 years, a hologram to talk to you.” …
It’s been exactly 10 years. He did not succeed.
One could argue that the nature of pioneers is to reach far and talk big, and that it’s churlish to single out any one failed prediction when science is so full of them. (Science writers joke that breakthrough medicines and technologies always seem five to 10 years away, on a rolling window.) But Markram’s claims are worth revisiting for two reasons. First, the stakes were huge: In 2013, the European Commission awarded his initiative—the Human Brain Project (HBP)—a staggering 1 billion euro grant (worth about $1.42 billion at the time). Second, the HBP’s efforts, and the intense backlash to them, exposed important divides in how neuroscientists think about the brain and how it should be studied.
Markram’s goal wasn’t to create a simplified version of the brain, but a gloriously complex facsimile, down to the constituent neurons, the electrical activity coursing along them, and even the genes turning on and off within them. From the outset, the criticism to this approach was very widespread, and to many other neuroscientists, its bottom-up strategy seemed implausible to the point of absurdity. The brain’s intricacies—how neurons connect and cooperate, how memories form, how decisions are made—are more unknown than known, and couldn’t possibly be deciphered in enough detail within a mere decade. It is hard enough to map and model the 302 neurons of the roundworm C. elegans, let alone the 86 billion neurons within our skulls. “People thought it was unrealistic and not even reasonable as a goal,” says the neuroscientist Grace Lindsay, who is writing a book about modeling the brain. And what was the point? The HBP wasn’t trying to address any particular research question, or test a specific hypothesis about how the brain works. The simulation seemed like an end in itself—an overengineered answer to a nonexistent question, a tool in search of a use. …
Markram seems undeterred. In a recent paper, he and his colleague Xue Fan firmly situated brain simulations within not just neuroscience as a field, but the entire arc of Western philosophy and human civilization. And in an email statement, he told me, “Political resistance (non-scientific) to the project has indeed slowed us down considerably, but it has by no means stopped us nor will it.” He noted the 140 people still working on the Blue Brain Project, a recent set of positive reviews from five external reviewers, and its “exponentially increasing” ability to “build biologically accurate models of larger and larger brain regions.”
No time frame, this time, but there’s no shortage of other people ready to make extravagant claims about the future of neuroscience. In 2014, I attended TED’s main Vancouver conference and watched the opening talk, from the MIT Media Lab founder Nicholas Negroponte. In his closing words, he claimed that in 30 years, “we are going to ingest information. …
I’m happy to see the update. As I recall, there was murmuring almost immediately about the Human Brain Project (HBP). I never got details but it seemed that people were quite actively unhappy about the disbursements. Of course, this kind of uproar is not unusual when great sums of money are involved and the Graphene Flagship also had its rocky moments.
As for Yong’s contribution, I’m glad he’s debunking some of the hype and glory associated with the current drive to colonize the human brain and other efforts (e.g. genetics) which they often claim are the ‘future of medicine’.
To be fair. Yong is focused on the brain simulation aspect of the HBP (and Markram’s efforts in the Blue Brain Project) but there are other HBP efforts, as well, even if brain simulation seems to be the HBP’s main interest.
In 2013, the European Union funded the Human Brain Project, led by Markram, to the tune of $1.3 billion. Markram claimed that the project would create a simulation of the entire human brain on a supercomputer within a decade, revolutionising the treatment of Alzheimer’s disease and other brain disorders. Less than two years into it, the project was recognised to be mismanaged and its claims overblown, and Markram was asked to step down.
On 8 October 2015, the Blue Brain Project published the first digital reconstruction and simulation of the micro-circuitry of a neonatal rat somatosensory cortex.
I also looked up the Human Brain Project and, talking about their other efforts, was reminded that they have a neuromorphic computing platform, SpiNNaker (mentioned here in a January 24, 2019 posting; scroll down about 50% of the way). For anyone unfamiliar with the term, neuromorphic computing/engineering is what scientists call the effort to replicate the human brain’s ability to synthesize and process information in computing processors.
In fact, there was some discussion in 2013 that the Human Brain Project and the Graphene Flagship would have some crossover projects, e.g., trying to make computers more closely resemble human brains in terms of energy use and processing power.
The Human Brain Project’s (HBP) Silicon Brains webpage notes this about their neuromorphic computing platform,
Neuromorphic computing implements aspects of biological neural networks as analogue or digital copies on electronic circuits. The goal of this approach is twofold: Offering a tool for neuroscience to understand the dynamic processes of learning and development in the brain and applying brain inspiration to generic cognitive computing. Key advantages of neuromorphic computing compared to traditional approaches are energy efficiency, execution speed, robustness against local failures and the ability to learn.
Neuromorphic Computing in the HBP
In the HBP the neuromorphic computing Subproject carries out two major activities: Constructing two large-scale, unique neuromorphic machines and prototyping the next generation neuromorphic chips.
The large-scale neuromorphic machines are based on two complementary principles. The many-core SpiNNaker machine located in Manchester [emphasis mine] (UK) connects 1 million ARM processors with a packet-based network optimized for the exchange of neural action potentials (spikes). The BrainScaleS physical model machine located in Heidelberg (Germany) implements analogue electronic models of 4 Million neurons and 1 Billion synapses on 20 silicon wafers. Both machines are integrated into the HBP collaboratory and offer full software support for their configuration, operation and data analysis.
The most prominent feature of the neuromorphic machines is their execution speed. The SpiNNaker system runs at real-time, BrainScaleS is implemented as an accelerated system and operates at 10,000 times real-time. Simulations at conventional supercomputers typical run factors of 1000 slower than biology and cannot access the vastly different timescales involved in learning and development ranging from milliseconds to years.
Recent research in neuroscience and computing has indicated that learning and development are a key aspect for neuroscience and real world applications of cognitive computing. HBP is the only project worldwide addressing this need with dedicated novel hardware architectures.
I’ve highlighted Manchester because that’s a very important city where graphene is concerned. The UK’s National Graphene Institute is housed at the University of Manchester where graphene was first isolated in 2004 by two scientists, Andre Geim and Konstantin (Kostya) Novoselov. (For their effort, they were awarded the Nobel Prize for physics in 2010.)
Getting back to the HBP (and the Graphene Flagship for that matter), the funding should be drying up sometime around 2023 and I wonder if it will be possible to assess the impact.
Peter Bøggild over at DTU [Technical University of Denmark] just published an interesting opinion piece in Nature titled “The war on fake graphene”.
The piece refers to a paper published in Advanced Materials (“The Worldwide Graphene Flake Production”) that studied graphene purchased from 60 producers around the world.
The study’s [“The Worldwide Graphene Flake Production”] findings show unequivocally “that the quality of the graphene produced in the world today is rather poor, not optimal for most applications, and most companies are producing graphite microplatelets. This is possibly the main reason for the slow development of graphene applications, which usually require a customized solution in terms of graphene properties.”
A conclusion that sounds even more damming is that “our extensive studies of graphene production worldwide indicate that there is almost no high quality graphene, as defined by ISO [International Organization for Standardization], in the market yet.”
The team also points out that a large number of the samples on the market labelled as graphene are actually graphene oxide and reduced graphene oxide. Furthermore, carbon content analysis shows that in many cases there is substantial contamination of the samples and a large number of companies produce material a with low carbon content. Contamination has many possible sources but most likely, it arises from the chemicals used in the processes.
Graphite is composed of layers of carbon atoms just a single atom in thickness, known as graphene sheets, to which it owes many of its remarkable properties. When the thickness of graphite flakes is reduced to just a few graphene layers, some of the material’s technologically most important characteristics are greatly enhanced — such as the total surface area per gram, and the mechanical flexibility of the individual flakes. In other words, graphene is more than just thin graphite. Unfortunately, it seems that many graphene producers either do not know or do not care about this. …
Imagine a world in which antibiotics could be sold by anybody, and were not subject to quality standards and regulations. Many people would be afraid to use them because of the potential side effects, or because they had no faith that they would work, with potentially fatal consequences. For emerging nanomaterials such as graphene, a lack of standards is creating a situation that, although not deadly, is similarly unacceptable.
It seems that the high-profile scientific discoveries, technical breakthroughs and heavy investment in graphene have created a Wild West for business opportunists: the study shows that some producers are labelling black powders that mostly contain cheap graphite as graphene, and selling them for top dollar. The problem is exacerbated because the entry barrier to becoming a graphene provider is exceptionally low — anyone can buy bulk graphite, grind it to powder and make a website to sell it on.
Nevertheless, the work [“The Worldwide Graphene Flake Production”] is a timely and ambitious example of the rigorous mindset needed to make rapid progress, not just in graphene research, but in work on any nanomaterial entering the market. To put it bluntly, there can be no quality without quality control.
Here are links to and citations for the study providing the basis for both Berger’s Spotlight article and Bøggild’s opinion piece,
The Worldwide Graphene Flake Production by Alan P. Kauling, Andressa T. Seefeldt, Diego P. Pisoni, Roshini C. Pradeep, Ricardo Bentini, Ricardo V. B. Oliveira, Konstantin S. Novoselov [emphasis mine], Antonio H. Castro Neto. Advanced Materials Volume 30, Issue 44 November 2, 2018 1803784 https://doi.org/10.1002/adma.201803784
The study which includes Konstantin Novoselov, a Nobel prize winner for his and Andre Geim’s work at the University of Manchester where they first isolated graphene, is behind a paywall.