Showing posts with label graphene. Show all posts
Showing posts with label graphene. Show all posts

Wednesday, April 2, 2025

The Graphene Zoo

 

From its slightly accidental inception 20 years ago, graphene has now turned into a large branch on the tree of technogenetic life.

Decoding 2D material growth: White graphene insights open doors to cleaner energy and more efficient electronics
Jan 2025, phys.org

White Graphene - the name for hexagonal boron nitride (where you blast out some of the carbon atoms from graphene and fill them with boron nitride instead)

via University of Surrey and Graz University of Technology: Anthony J. R. Payne et al, Unravelling the Epitaxial Growth Mechanism of Hexagonal and Nanoporous Boron Nitride: A First‐Principles Microkinetic Model, Small (2025). DOI: 10.1002/smll.202405404



Graphyne's transformation: A new carbon form with potential for electronics
Feb 2025, phys.org

Graphyne - It's not graphene, it's not carbon like diamonds with its 3-D lattice, it's not like graphite with its 2-D lattice, and it's not graphene with it's 1-D 2-D lattice. It's a 1-D 2-D 3-D lattice. Got it?

via Case Western Reserve University: Ali E. Aliev et al, A planar-sheet nongraphitic zero-bandgap sp2 carbon phase made by the low-temperature reaction of γ-graphyne, Proceedings of the National Academy of Sciences (2025). DOI: 10.1073/pnas.2413194122


Synthetic diamond with hexagonal lattice outshines the natural kind with unprecedented hardness
Feb 2025, phys.org

Synthetic hexagonal diamonds - heating graphene samples to high temperatures while inside a high-pressure chamber. By adjusting the parameters of their setup, the researchers found they could get the graphene to grow into a synthetic diamond with hexagonal lattices.

via Umeå University and materials scientists and engineers affiliated with several institutions in China such as Jilin University: Desi Chen et al, General approach for synthesizing hexagonal diamond by heating post-graphite phases, Nature Materials (2025). DOI: 10.1038/s41563-025-02126-9


Olympicene molecular chains create quantum spin systems with spintronics applications
Mar 2025, phys.org

Olympicenes - open-shell nanographenes (shaped like the Olympics logo)

via Max Planck Institute of Microstructure Physics: Chenxiao Zhao et al, Spin excitations in nanographene-based antiferromagnetic spin-1/2 Heisenberg chains, Nature Materials (2025). DOI: 10.1038/s41563-025-02166-1

Sunday, February 2, 2025

Graphene's End


Since its discovery in 2004, graphene has been heralded as the wonder material of the 21st century, and has been featured here quite often. It's spawned a whole new field of science basically, and it's called metameterials science, based on what's called two-dimensional materials. Twenty years later, we've reached peak graphene, with the news now being taken over by all things -ene, such as goldene or borophene, as seen below:

'Better than graphene' material development may improve implantable technology
May 2024, phys.org
https://phys.org/news/2024-05-graphene-material-implantable-technology.html

Borophene - It's the new graphene, impregnated with boron atoms, which makes it do even crazier things than graphene.

via Pennsylvania State University: Teresa Aditya et al, Chiral Induction in 2D Borophene Nanoplatelets through Stereoselective Boron–Sulfur Conjugation, ACS Nano (2024). DOI: 10.1021/acsnano.4c01792

Image credit: I can find no other credits except for a "3D-news" but this image is possibly related to 2010 Nobel Prize winner Andre Geim, who discovered graphene at University of Manchester in 2004. 


Electric fields boost graphene's potential, study shows
Jun 2024, phys.org

From the home of graphene, Manchester University:
"We demonstrate that electric field effects can disentangle and accelerate electrochemical processes in 2D crystals. This could be combined with state-of-the-art catalysts to efficiently drive complex processes like CO2 reduction, which remain enormous societal challenges."

"Control of these processes gives our graphene devices dual functionality as both memory and logic gate. This paves the way for new computing networks that operate with protons. This could enable compact, low-energy analog computing devices."

via University of Manchester National Graphene Institute: Jincheng Tong et al, Control of proton transport and hydrogenation in double-gated graphene, Nature (2024). DOI: 10.1038/s41586-024-07435-8.


Post Script: Moiré lattices is where you go when graphene ends, so:
Twist-angle in moiré lattice controls valley polarization switching in heterostructures
May 2024, phys.org

In case you were wondering, "they demonstrated for the first time the dependence of valley polarization switching and polarization degree on the moiré period by twist engineering in electrically controlled transition metal dichalcogenide heterobilayers". 

via Institute of Physics of the Chinese Academy of Sciences and Prof. Xu Xiulai of Peking University: Danjie Dai et al, Twist angle–dependent valley polarization switching in heterostructures, Science Advances (2024). DOI: 10.1126/sciadv.ado1281

Wednesday, September 11, 2024

The Graphene Legacy


Graphene was first discovered around 2004, and since then it's changed the world of science in ways far greater than most materials ever discovered. But we're at the point now where it's time to move on. Seeing the word "graphene" in a headline is no longer enough to make you want to see what it's doing. 

There's graphene but made of gold (goldene), there's something better than graphene (made of boron nitride), and there's the moiré lattice phenomena, which seems about as mindblowing as graphene itself was twenty years ago. 

Here are a few examples of how we're going ahead into the post-graphene world, and from now on, news about graphene will be limited to make for other things:

Researchers put a new twist on graphite
Jul 2023, phys.org

Didn't see this one coming!

They placed a single layer of graphene on top of a thin, bulk graphite crystal, and then introduced a twist angle of around 1 degree between graphite and graphene. They detected novel and unexpected electrical properties not just at the twisted interface, but deep in the bulk graphite as well. The electrical properties of the whole material differed markedly from typical graphite.

"Though we were generating the moiré pattern only at the surface of the graphite, the resulting properties were bleeding across the whole crystal."

Also: "Interdimensional" means mixed dimensional materials, like embedding 2D graphene into 3D graphite.

via University of Washington, Osaka University and the National Institute for Materials Science in Japan: Matthew Yankowitz, Mixed-dimensional moiré systems of twisted graphitic thin films, Nature (2023). DOI: 10.1038/s41586-023-06290-3.


Navigating moiré physics and photonics with band offset tuning
Oct 2023, phys.org

They started with a mismatched silicon-based bilayer moiré superlattice and adjusted the band offset by varying the thickness of one layer of the superlattices, to find that the offset effectively controls the moiré flatbands.

via SPIE Society of Photo-Optical Instrumentation Engineers, University of Electronic Science and Technology of China, Anqing Normal University, Guangxi University, and Nankai University: Peilong Hong et al, Robust moiré flatbands within a broad band-offset range, Advanced Photonics Nexus (2023). DOI: 10.1117/1.APN.2.6.066001


Researchers create first functional semiconductor made from graphene
Jan 2024, phys.org

Where you been - world's first functional semiconductor made from graphene

via Georgia Institute of Technology: Walt de Heer, Ultrahigh-mobility semiconducting epitaxial graphene on silicon carbide, Nature (2024). DOI: 10.1038/s41586-023-06811-0. 


Unlocking exotic physics: Exploring graphene's topological bands in super-moiré structures
Apr 2024, phys.org

Super-Moiré all day 

They're sandwiching monolayer graphene between two bulk boron nitride layers to create a new structure known as a super-moiré structure (whereas regular moiré is just two graphene layers).

via National University of Singapore:  Mohammed M. Al Ezzi et al, Topological Flat Bands in Graphene Super-Moiré Lattices, Physical Review Letters (2024). DOI: 10.1103/PhysRevLett.132.126401.


A single atom layer of gold—researchers create goldene
Apr 2024, phys.org
https://phys.org/news/2024-04-atom-layer-gold-goldene.html

Goldene - a sheet of gold only a single atom layer thick

via Linköping University: Synthesis of goldene comprising single-atom layer gold, Nature Synthesis (2024). DOI: 10.1038/s44160-024-00518-4

Tuesday, November 28, 2023

Words, for the Corpus That Has It All


The following update to the 'list of crazy words you read when scanning science press headlines', 6 months from April 2023 to October 2023. This one is a big list, an avalanche of verbal programming; start your semantic engines.

Appropriately illustrated by artificial intelligence engine-generated images of Dental Art, starting with the above image, prompted by the words "Hyperrealistic pink tissue bloody gums slippery glistening" but I just call it Dental Art.


Researchers develop the first-ever ingestible electroceutical device to control appetite by hormone modulation
Apr 2023, phys.org

"Electroceuticals" - for the neuromodulation of the gut-brain axis 

via NYU: Khalil Ramadi et al, Bioinspired, ingestible electroceutical capsules for hunger-regulating hormone modulation, Science Robotics (2023). DOI: 10.1126/scirobotics.ade9676.


Meteosat-12: Europe's new weather satellite takes first photos
Apr 2023, BBC News

"Nowcasting" - (like forecasting but better) the ability to say with greater confidence that violent winds, lightning, hail or heavy downpours are about to strike a particular area; Europe's new weather satellite Meteosat-12 flies 36,000km above the Earth and takes pictures every 10 minutes

And the word nowcasting, in the wild: "The insights gained from linking lightning intensity to eruptive activity can provide better monitoring and nowcasting of aviation-related hazards during a large volcanic eruption, including ash cloud development and movement," Van Eaton said." -New study shows Tonga's Hunga eruption produced the most intense lightning ever recorded. Jun 2023. phys.org
https://phys.org/news/2023-06-tonga-hunga-eruption-intense-lightning.html ; and via American Geophysical Union: Alexa R. Van Eaton et al, Lightning Rings and Gravity Waves: Insights Into the Giant Eruption Plume From Tonga's Hunga Volcano on 15 January 2022, Geophysical Research Letters (2023). DOI: 10.1029/2022GL102341. https://dx.doi.org/10.1029/2022GL102341


'Bioprospecting' technique uncovers viruses that can kill deadly superbugs
May 2023, phys.org

"Bioprospecting" for viruses known as phages that can kill deadly superbugs; like "bioprospector" will be a word on someone's resume soon

via Monash University: Rhys A. Dunstan et al, Epitopes in the capsular polysaccharide and the porin OmpK36 receptors are required for bacteriophage infection of Klebsiella pneumoniae, Cell Reports (2023). DOI: 10.1016/j.celrep.2023.112551


DarkBERT learns language of the Dark Web
May 2023, phys.org

Fucking "DarkBERT" - A Language Model for the Dark Side of the Internet

FYI - "Surface Web content" (as opposed to "Dark Web content") I think what this is saying, without saying it, is that the internet is English, but the Dark Web is not, so they can't use the internet as their training model like we do with all the others.

via Institute for Critical Infrastructure Technology: Youngjin Jin et al, DarkBERT: A Language Model for the Dark Side of the Internet, arXiv (2023). DOI: 10.48550/arxiv.2305.08596



Combining twistronics with spintronics could be the next giant leap in quantum electronics
Jun 2023, phys.org

I try to keep up, but -- "Twistronics", "spintronics", and "tunable moiré magnetism"

via Tohoku University: Guanghui Cheng et al, Electrically tunable moiré magnetism in twisted double bilayers of chromium triiodide, Nature Electronics (2023). DOI: 10.1038/s41928-023-00978-0


Researchers grow bio-inspired polymer brains for artificial neural networks
Jul 2023, phys.org

Neuromorphic "wetware" - based on memristive devices via electropolymerization aka growing wires

via Osaka University and Hokkaido University: Naruki Hagiwara et al, Fabrication and Training of 3D Conductive Polymer Networks for Neuromorphic Wetware, Advanced Functional Materials (2023). DOI: 10.1002/adfm.202300903


New study reveals why defense against brain corrosion declines in people with Alzheimer's disease
Jul 2023, phys.org

"Brain corrosion" - Why yes, oxidative stress corrodes the brain, and that's called oxidative damage. Some might even call it "rust", brain rust. 

via Case Western Reserve University: Sara Cazzaro et al, Slingshot homolog-1–mediated Nrf2 sequestration tips the balance from neuroprotection to neurodegeneration in Alzheimer's disease, Proceedings of the National Academy of Sciences (2023). DOI: 10.1073/pnas.2217128120



Photonic time crystals could open the door to a new branch of optics
Jul 2023, phys.org

"Photonic Time Crystals" - they are the temporal version of photonic crystals, and in the optical domain could have profound implications for the science of light, enabling truly disruptive applications in the future

Just for background, and because this will all become the new computers of the next technological revolution -- "photonic crystals have a refractive index that oscillates periodically in space causing iridescence of precious minerals and insect wings for example."

via Technion-Israel Institute of Technology, Haifa, Israel, and Purdue University:  Eran Lustig et al, Time-refraction optics with single cycle modulation, Nanophotonics (2023). DOI: 10.1515/nanoph-2023-0126


Researchers put a new twist on graphite
Jul 2023, phys.org

"Interdimensional" - mixed dimensional materials, like embedding 2D graphene into 3D graphite

via University of Washington, Osaka University and the National Institute for Materials Science in Japan: Matthew Yankowitz, Mixed-dimensional moiré systems of twisted graphitic thin films, Nature (2023). DOI: 10.1038/s41586-023-06290-3.


Spontaneous quasi-crystal self-assembly observed using tiny vibrating magnetic spheres
Jul 2023, phys.org

"Spontaneous Crystals" aka "Spontaneous Quasi-Crystal Self-Assembly" - discovered sort of by accident

via Université Paris-Saclay: Andrea Plati et al, Quasi-crystalline order in vibrated granular matter, arXiv (2023). DOI: 10.48550/arxiv.2307.01643


Zentropy and the art of creating new ferroelectric materials
Aug 2023, phys.org

"Zentropy" - The "Z" in zentropy stands for the German word Zustandssumm, meaning "sum over states" of entropy, and alternatively considered a play on the term "zen" from Buddhism, and the idea is to consider how entropy can occur over multiple scales within a system to help predict potential outcomes of the system when influenced by its surroundings. It's also a parameter-free pathway to predicting how advanced materials behave. And in other words, it can integrate top-down statistical and bottom-up quantum mechanics to predict experimental measures of the system without "fitting parameters" to closely match real-world variables.

via Penn State: Zi-Kui Liu et al, Parameter-free prediction of phase transition in PbTiO3 through combination of quantum mechanics and statistical mechanics, Scripta Materialia (2023). DOI: 10.1016/j.scriptamat.2023.115480



Researchers use 'topological gardening' to achieve unexpected spin transport
Aug 2023, phys.org

Fastest forming word cluster in the sciences, that's all --

"Topological Gardening" - Although topological insulators conduct electricity only along their edges, and strictly in one direction, new science challenges that view by uncovering a new type of edge transport by manipulating edge states through bulk-edge interactions, similar to the pruning work done in gardening routines.

via Monash University: Yuefeng Yin et al, Extracting unconventional spin texture in two dimensional topological crystalline insulator bismuthene via tuning bulk-edge interactions, Materials Today Physics (2023). DOI: 10.1016/j.mtphys.2023.101168

Also: Qile Li et al, Localized Wannier function based tight-binding models for two-dimensional allotropes of bismuth, New Journal of Physics (2021). DOI: 10.1088/1367-2630/ac04c9


This fish doesn't just see with its eyes, it also sees with its skin
Aug 2023, phys.org

"Skin Vision" -- Hogfish can change color, and carry a gene for a light-sensitive protein called opsin that is activated in their skin, and that this gene is different from the opsin genes found in their eyes. Their skin is made of cells called chromatophores which contain pigment, with opsin proteins residing in a previously unknown cell type right underneath the chromatophore, which means that light striking the skin must pass through the pigment-filled chromatophores first before it reaches the light-sensitive layer, suggesting that their skin acts like internal Polaroid film, capturing changes in the light, so that they can "literally take a photo of their own skin from the inside".

via Duke University: Lorian Schweikert, Dynamic light filtering over dermal opsin as a sensory feedback system in fish color change, Nature Communications (2023). DOI: 10.1038/s41467-023-40166-4.


Scientists develop finger sweat test to detect antipsychotic drugs in patients
Aug 2023, phys.org

"Finger Sweat Test" - Scientists have now discovered a way to test the levels of common antipsychotic drugs (clozapine, quetiapine, or olanzapine) in the sweat from patients' fingerprints (and because blood tests are invasive and uncomfortable).

via University of Surrey: Noninvasive drug adherence monitoring of antipsychotic patients via finger sweat testing, Frontiers in Chemistry (2023). DOI: 10.3389/fchem.2023.1245089


Researchers prep fentanyl, heroin vaccines for human trials
Aug 2023, phys.org

"Heroin Vaccine" - Just the words heroin vaccine.

via University of Montana: Bethany Crouse et al, A TLR7/8 agonist increases efficacy of anti-fentanyl vaccines in rodent and porcine models, npj Vaccines (2023). DOI: 10.1038/s41541-023-00697-9


Crack vaccine research on rats could help babies of mothers who use cocaine—and reduce addiction
Oct 2023, phys.org

"Crack Vaccine" - Also. I have a feeling it doesn't end here. 

via Universidade Federal de Minas Gerais in Brazil: Rachel J. Stephenson et al, Anti-cocaine Vaccine Development: Where Are We Now and Where Are We Going?, Journal of Medicinal Chemistry (2023). DOI: 10.1021/acs.jmedchem.3c00366



Team simulates collective movement of worm blobs for future swarm robotic systems
Sep 2023, phys.org

"Swarm Ball", "Worm Ball", or "Swarm Robot Worm Ball" - systems of many individual components that must work collectively, using soft-bodied agents

(click on the article above for some high octane nightmare fuel)

via Tohoku University and Hiroshima University: Taishi Mikami et al, Elongating, entwining, and dragging: mechanism for adaptive locomotion of tubificine worm blobs in a confined environment, Frontiers in Neurorobotics (2023). DOI: 10.3389/fnbot.2023.1207374


Vulnerability to different COVID-19 mutations depends on previous infections and vaccination, study suggests
Oct 2023, phys.org

"Antigenic Cartography" - compares the similarity of different variants of the SARS-CoV-2 virus to measure how well human antibodies formed in response to infection with one virus respond to infection with a variant of that virus (and because they found that a person's immune response to SARS-CoV-2 depends on the variant they were previously exposed to)

via University of Cambridge's Center for Pathogen Evolution in the Department of Zoology: Samuel H. Wilks et al, Mapping SARS-CoV-2 antigenic relationships and serological responses, Science (2023). DOI: 10.1126/science.adj0070.



Next-generation printing: Precise and direct, using optical vortices
Oct 2023, phys.org

An "Optical Vortex Laser" - "Using a special laser beam known as an optical vortex, we have achieved stable printing of high-viscosity liquids that allows for the fabrication of microdroplet laser arrays and the micropatterning of conductive nanoinks, as well as bioinks for cell scaffolds, leading to the establishment of next-generation printed photonic or electronic devices."

via Osaka Metropolitan University:  Ken-ichi Yuyama et al, Fabrication of an Array of Hemispherical Microlasers Using Optical Vortex Laser-Induced Forward Transfer, ACS Photonics (2023). DOI: 10.1021/acsphotonics.3c01005


Photonic crystals bend light as though it were under the influence of gravity
Oct 2023, phys.org

"Pseudogravity" - replicating the effects of gravity

Also, they don't say moiré but they describe it: Kitamura and her colleagues modified photonic crystals by introducing lattice distortion; gradual deformation of the regular spacing of elements, which disrupted the grid-like pattern of protonic crystals. This manipulated the photonic band structure of the crystals, resulting in a curved beam trajectory in-medium—just like a light-ray passing by a massive celestial body such as a black hole.

via Tohoku University: Kanji Nanjyo et al, Deflection of electromagnetic waves by pseudogravity in distorted photonic crystals, Physical Review A (2023). DOI: 10.1103/PhysRevA.108.033522


Sabotage tool takes on AI image scrapers
Oct 2023, phys.org

"Data poisoning" - the tool named Nightshade manipulates image pixels that will alter the output during training but are not visible to the naked eye prior to processing. The tool is meant to "poison" graphics appropriated by AI companies to train image-generating models. "A moderate number of Nightshade attacks can destabilize general features in a text-to-image generative model, effectively disabling its ability to generate meaningful images," Zhao said. 

via University of Chicago: Shawn Shan et al, Prompt-Specific Poisoning Attacks on Text-to-Image Generative Models, arXiv (2023). DOI: 10.48550/arxiv.2310.13828

Tuesday, May 2, 2023

More Moiré


At the confluence of twisted magic angle nanosandwiches and the much bigger news of the accidental Kuhning of the universe comes an unlikely character, the moiré lattice.

It's a grid, the two-dimensional piece of molecular paper epitomized as the graphene sheet, but it's two of them sandwiched on top of each other, and then turning one slightly so the grid no longer matches up. It's like the chain link fence that creates undulating optical illusions when layered with another fence; these two nanosheets do weird things to the field that exist between them. 

Moiré lattices are being used to create weird crystals, so they're a big part of optoelectronics because crystals manipulate lasers. And they're also providing a novel model of physical interaction that's unexpectedly mirrored in the fabric of spacetime, which might give us a very different idea about how the universe works. 


New quasiparticle discovered in moiré patterns
Nov 2022, phys.org

They found an exciton in there - an electrically neutral quasiparticle that can carry energy and consists of an electron and electron "hole" that can be created for example by light impinging certain semiconductors and other materials.

Coming soon -  "post-silicon nanoscale optoelectronic devices"

via University of Texas at Austin: Mit H. Naik et al, Intralayer charge-transfer moiré excitons in van der Waals superlattices, Nature (2022). DOI: 10.1038/s41586-022-04991-9


Moiré superlattices show superpower in photonics and optoelectronics
Mar 2023, phys.org

"The era of moiré photonics and optoelectronics is coming."

Moiré superlattices are artificial quantum materials formed by vertically stacking two or more two-dimensional (2D) layered materials with a slight lattice mismatch and/or a small rotational twist. They introduce a potential landscape of much larger length scale than the crystal periodicity of the constituent 2D layers, providing a novel paradigm for engineering band structures and hence a plethora of exotic quantum phenomena.

via Chinese Academy of Sciences:  Luojun Du et al, Moiré photonics and optoelectronics, Science (2023). DOI: 10.1126/science.adg0014.

See also:

Post Script:
New one for me - "Ab initio" calculations ("from the beginning) are computations of electronic orbitals with no other hypotheses than Coulomb interactions between all electrons and nuclei with electrons obeying Fermi statistics with the Pauli exclusion principle.

Or - the only inputs into an ab initio calculation are physical constants; Ab initio quantum chemistry methods attempt to solve the electronic Schrödinger equation given the positions of the nuclei and the number of electrons [wiki]

Here's some examples:
Artist Frank Michielli does some cool fence-art



Wednesday, October 26, 2022

Things Come To Life


Surely we won't see it until it's already infiltrating every kingdom and phylum -- what once was just a dumb robot, or a box of rocks, or a pile of dust, will soon be alive and trying to make its way in the world, commanding the same respect as the river in Ecuador that has rights, or the endangered animals in the Galapagos that have rights, or the dematerialized algorithms that exist as a dimensionally camouflaged meta-entity powered by economic incentive and psychological manipulation, which doesn't even need rights because it's the lifeline of global commerce. 

One day we'll all be held ethically liable for treating our stuff like inert, soul-less matter.



Starfish embryos swim in formation like a 'living crystal,' could inform the design of self assembling 
Jul 2022, phys.org

Fakhri says the team's observations of starfish crystals was a "serendipitous discovery." 

She and her colleagues fertilized thousands of starfish embryos, then watched as they swam to the surface of shallow dishes. "There are thousands of embryos in a dish, and they start forming this crystal structure that can grow very large," Fakhri says. "We call it a crystal because each embryo is surrounded by six neighboring embryos in a hexagon that is repeated across the entire structure, very similar to the crystal structure in graphene."

via MIT: Nikta Fakhri, Odd dynamics of living chiral crystals, Nature (2022). DOI: 10.1038/s41586-022-04889-6.


A step toward the creation of materials controlled by artificial genes
Aug 2022, phys.org

"New types of soft material robots that are controlled by chemistry instead of electronics."

Say you're making artificial humans without saying you're making artificial humans.

"Engineering synthetic chemical systems that can emulate the complex behaviors of natural gene networks that operate inside diagnostic, self-healing materials rather than organisms."

via Johns Hopkins University: Samuel W. Schaffter et al, Standardized excitable elements for scalable engineering of far-from-equilibrium chemical networks, Nature Chemistry (2022). DOI: 10.1038/s41557-022-01001-3


Synthetic mouse embryo develops beating heart
Aug 2022, BBC News

Scientists in Cambridge have created synthetic mouse embryos in a lab, without using eggs or sperm, which show evidence of a brain and beating heart.

At present, UK law permits human embryos to be studied in the laboratory only up to the fourteenth day of development, but there are no rules around synthetic embryos.

via University of Cambridge and the California Institute of Technology: Synthetic embryos complete gastrulation to neurulation and organogenesis. Gianluca Amadei et al. Nature. 2022. https://doi.org/10.1038/s41586-022-05246-3


Robo-bug: A rechargeable, remote-controllable cyborg cockroach
Sep 2022, phys.org

Powered by a solar cell which is funny because roaches hang out in the dark mostly.

RIKEN: Yujiro Kakei et al, Integration of body-mounted ultrasoft organic solar cell on cyborg insects with intact mobility, npj Flexible Electronics (2022). DOI: 10.1038/s41528-022-00207-2


Nanotubes illuminate the way to living photovoltaics
Sep 2022, phys.org

"We put nanotubes inside of bacteria" 

via Ecole Polytechnique Federale de Lausanne:  Ardemis Boghossian et al, Carbon nanotube uptake in cyanobacteria for near-infrared imaging and enhanced bioelectricity generation in living photovoltaics, Nature Nanotechnology (2022). DOI: 10.1038/s41565-022-01198-x


Post Script:
GlyNAC supplementation reverses aging hallmarks in aging humans
Aug 2022, phys.org

A randomized, double blind human clinical trial conducted by researchers at Baylor College of Medicine reveals that supplementation with GlyNAC—a combination of glycine and N-acetylcysteine—improves many age-associated defects in older humans and powerfully promotes healthy aging. 

via Baylor College of Medicine:  Premranjan Kumar et al, Supplementing Glycine and N-Acetylcysteine (GlyNAC) in Older Adults Improves Glutathione Deficiency, Oxidative Stress, Mitochondrial Dysfunction, Inflammation, Physical Function, and Aging Hallmarks: A Randomized Clinical Trial, The Journals of Gerontology: Series A (2022). DOI: 10.1093/gerona/glac135


Friday, September 30, 2022

Graphene Matters


Long-hypothesized 'next generation wonder material' created for first time
May 2022, phys.org

Just when you thought you had enough graphene, now there's graphyne, next in line.

via University of Colorado at Boulder: Yiming Hu et al, Synthesis of γ-graphyne using dynamic covalent chemistry, Nature Synthesis (2022). DOI: 10.1038/s44160-022-00068-7


Electric shock to petroleum coke generates sustainable graphene
Jun 2022, phys.org

Using a chemical process called electrochemical exfoliation, they have converted petroleum coke into graphene.

via Texas A&M University: Sanjit Saha et al, Sustainable production of graphene from petroleum coke using electrochemical exfoliation, npj 2D Materials and Applications (2021). DOI: 10.1038/s41699-021-00255-8


New method helps exfoliate hexagonal boron nitride nanosheets
Jun 2022, phys.org

It sounds like they're growing it like they did to ice back in the day before refrigeration compressors:

"Water-icing triggered exfoliation process" of hexagonal boron nitride nanosheets (h-BNNSs), similar to graphene.

Based on molecular dynamics simulations, researchers suggested that -OH groups can cause local structural distortion in the defects or edges of h-BN flakes to form an "entrance" for water molecules coming into the h-BNNS interlayer, which can generate nuclei for ice nucleation that can slowly change in shape and size until they reach a stage that allows rapid expansion as the temperature drops sharply, resulting in efficient exfoliation of h-BNNSs.

via Chinese Academy of Sciences: Lulu An et al, Water-icing-triggered scalable and controllable exfoliation of hexagonal boron nitride nanosheets, Cell Reports Physical Science (2022). DOI: 10.1016/j.xcrp.2022.100941


New member added to carbon material family, a two-dimensional monolayer polymeric fullerene
Jun 2022, phys.org

Graphene by extension...

"The work is the first to synthesize a monolayer polymeric fullerene. It is of great significance, as it adds a new member to the carbon material family," Zheng said.

Well, what's it called? "Monolayer Polymeric C60" isn't cutting it.

via Chinese Academy of Sciences: Jian Zheng, Synthesis of a monolayer fullerene network, Nature (2022). DOI: 10.1038/s41586-022-04771-5.


Post Script:
Graphene synapses advance brain-like computers
Aug 2022, phys.org

Synaptic transistors for biocompatible, brain-like computers using graphene and nafion, a polymer membrane material.

via University of Texas at Austin: Dmitry Kireev et al, Metaplastic and energy-efficient biocompatible graphene artificial synaptic transistors for enhanced accuracy neuromorphic computing, Nature Communications (2022). DOI: 10.1038/s41467-022-32078-6

Friday, September 9, 2022

Quantum Update


Quantum physics in proteins - AI affords unprecedented insights into how biomolecules work
Nov 2021, phys.org

I hear the quantum biology headlines humming.

via Deutsches Elektronen-Synchrotron: Abbas Ourmazd, Few-fs resolution of a photoactive protein traversing a conical intersection, Nature (2021). DOI: 10.1038/s41586-021-04050-9



Physicists create compressible optical quantum gas
Mar 2022, phys.org

Calling BECs (Bose-Einstein Condensate) a "super photon" by the way.

via University of Bonn: Erik Busley et al, Compressibility and the equation of state of an optical quantum gas in a box, Science (2022). DOI: 10.1126/science.abm2543.


Physicists report on first programmable quantum sensor
Mar 2022, phys.org

"In the development of quantum computers, we have learned to create tailored entangled states." 
("Custom Quantum", am I right?)

via University of Innsbruck: Christian Marciniak, Optimal metrology with programmable quantum sensors, Nature (2022). DOI: 10.1038/s41586-022-04435-4.

Also: Quantum Variational Optimization of Ramsey Interferometry and Atomic Clocks, Physical Review X (2021). DOI: 10.1103/PhysRevX.11.041045.


Chinese team breaks distance record for quantum secure direct communication
Apr 2022, phys.org

Distance of 102.2 km.
Prior to this new effort, the record was just 18 km.

via Tsinghua University in China: Haoran Zhang et al, Realization of quantum secure direct communication over 100 km fiber with time-bin and phase quantum states, Light: Science & Applications (2022). DOI: 10.1038/s41377-022-00769-w

Tying Quantum Knots - TU Delft - 2022

It takes three to tangle: Long-range quantum entanglement needs three-way interaction
May 2022, phys.org

The researchers' findings are consistent with previous observations that long-range entanglement survives at a non-zero temperature only when more than three subsystems are involved.

via RIKEN: Tomotaka Kuwahara et al, Exponential Clustering of Bipartite Quantum Entanglement at Arbitrary Temperatures, Physical Review X (2022). DOI: 10.1103/PhysRevX.12.021022


Tunable quantum traps for excitons
May 2022, phys.org

Physicists can now string together many such trapped excitons and adjust them in such a way that they emit photons having exactly the same properties. "That would allow one to create identical single photon sources for quantum information processing," 

via ETH Zurich: Deepankur Thureja et al, Electrically tunable quantum confinement of neutral excitons, Nature (2022). DOI: 10.1038/s41586-022-04634-z


Scientists use quantum computers to simulate quantum materials
May 2022, phys.org

"Computational Materials" sounds like another way of saying "active matter"?

Also "Hardware Noise":
Performing calculations of the properties of materials and molecules on quantum computers faces a problem that one does not experience with a classical computer, a phenomenon known as hardware noise. Noisy calculations return slightly different answers each time a calculation is performed; a noisy addition operation might return values slightly different from 4 each time for the question, "What is 2 plus 2?"

via Argonne National Laboratory's Midwest Integrated Center for Computational Materials and University of Chicago: Benchen Huang et al, Simulating the Electronic Structure of Spin Defects on Quantum Computers, PRX Quantum (2022). DOI: 10.1103/PRXQuantum.3.010339


Researchers achieve record entanglement of quantum memories
Jul 2022, phys.org

Again with the "quantum memories" term:
Researchers coupled two atomic quantum memories using two optically trapped rubidium atoms in two laboratories on the LMU campus connected via a 700-meter-long fiber optic cable.

via Ludwig Maximilian University of Munich: Tim van Leent et al, Entangling single atoms over 33 km telecom fibre, Nature (2022). DOI: 10.1038/s41586-022-04764-4


Scientists invent 'quantum flute' that can make particles of light move together
Jul 2022, phys.org

Ah yes, the quantum flute, we've been waiting for that one.

via University of Chicago: Srivatsan Chakram et al, Seamless High- Q Microwave Cavities for Multimode Circuit Quantum Electrodynamics, Physical Review Letters (2021). DOI: 10.1103/PhysRevLett.127.107701


Strange new phase of matter created in quantum computer acts like it has two time dimensions
Jul 2022, phys.org

First, the time thing:
By shining a laser pulse sequence inspired by the Fibonacci numbers at atoms inside a quantum computer, physicists have created a remarkable, never-before-seen phase of matter. The phase has the benefits of two time dimensions despite there still being only one singular flow of time, the physicists report July 20 in Nature.

Information stored in the phase is far more protected against errors than with alternative setups currently used in quantum computers. As a result, the information can exist without getting garbled for much longer, an important milestone for making quantum computing viable, says study lead author Philipp Dumitrescu.

The approach's use of an "extra" time dimension "is a completely different way of thinking about phases of matter."

Next, never seen this phrasing til now:
"stayed quantum"

via Simons Foundation: Philipp Dumitrescu, Dynamical topological phase realized in a trapped-ion quantum simulator, Nature (2022). DOI: 10.1038/s41586-022-04853-4


Researchers explore a new connection between topology and quantum entanglement
Aug 2022, phys.org

"Our work ties two big ideas together," says Charles Kane, the Christopher H. Browne Distinguished Professor of Physics in Penn's School of Arts & Sciences. "It's a conceptual link between topology, which is a way of characterizing the universal features that quantum states have, and entanglement, which is a way in which quantum states can exhibit non-local correlations, where something that happens in one point in space is correlated with something that happens in another part in space. What we've found is a situation where those concepts are tightly intertwined."
The eureka, and one of the pandemic sort:
The seed for exploring this connection came during the long hours Kane spent in his home office during the pandemic, pondering new ideas. One train of thought had him envisioning the classic textbook image of the Fermi surface of copper, which represents the metal's potential electron energies. It's a picture every physics student sees, and one with which Kane was highly familiar.

"Of course, I learned about that picture back in the 1980s but had never thought about it as describing a topological surface," Kane says. ...

via University of Pennsylvania: Pok Man Tam et al, Topological Multipartite Entanglement in a Fermi Liquid, Physical Review X (2022). DOI: 10.1103/PhysRevX.12.031022


Unexpected quantum effects in natural double-layer graphene
Aug 2022, phys.org

Again with the unexpected:
At temperatures just above absolute zero of minus 273.15 degrees Celsius, the electrons in the graphene can interact with each other—and a variety of complex quantum phases emerge completely unexpectedly. 

via University of Göttingen and University of Texas at Dallas: Anna M. Seiler et al, Quantum cascade of correlated phases in trigonally warped bilayer graphene, Nature (2022). DOI: 10.1038/s41586-022-04937-1


Post Script on the Sub- and Super-Luminal:
Listen to this guy Andrzej Dragan  talk about the "Quantum principle of relativity" at the Centrum Fizyki Teoretycznej, 2020-05-20

(the visuals come in at 19:40)

Thursday, September 16, 2021

Cryptographic Carbon Markets


Using carbon is key to decarbonizing economy
Aug 2021, phys.org

Instead of burning the hydrocarbons for energy, split them into carbon nanotubes for a materials revolution, and hydrogen for a hydrogen power revolution. 

Graphene and Hydrogen factories for mining electronic money, if you don't think it's going to happen you're not trying hard enough.

(Granted, this project, at Rice University, is related to Shell, the oil company, who would really like to see a future where hydrocarbons are still really important. Then again, if carbon-based nanotubes could replace metals, which use a ton of energy to mine and process, that could be a benefit in itself?)

Post Script:
The Bitcoin saga continues to deliver:

Researchers found a seasonal movement of mining between Chinese provinces in response, it was suggested, to the availability of hydro-electric power.

Mining moved from the coal-burning northern province of Xinjiang in the dry season, to the hydro-abundant southern province of Sichuan in the rainy season.

China's ban on cryptocurrency mining has forced bitcoin entrepreneurs to flee overseas. Many are heading to Texas, which is quickly becoming the next global cryptocurrency capital.

"Bitcoin refugees" in the "Great Mining Migration" are looking for more relaxed digital currency policy, a stable regulatory environment, diverse sources of capital, and cheap electricity. (How about a reliable power grid though? Seriously?)

I hope people are taking notes, because the crypto saga is a playbook for the way things are going to be. Bitcoin is doing to the future of energy production and computation what the pandemic did to all things "remote" -- the work-from-home revolution would take another 10 years without the pandemic. 

With or without the climate apocalypse to speed things up, not only will renewable energy production decentralize and redistribute into a splintered scattering of nodes, but those nodes move with the weather. 

Monday, July 26, 2021

Meta-Materials Mega-Thread

The phrase "metallic-organic framework" (MOF) has been appearing in headlines with more frequency, seemingly out of nowhere. Then again, when the material science revolution is fully underway, we will also wonder where the heck it came from. 

MOFs fall into the same general category as meta-materials, related to nano-this and graphene-that. These articles are a reminder that we're in for a whole new world. Kind of like what plastic did for the post-war world we live in today, or the synthetic chemical revolution of the late 1800's that gave our world "colors". 

Image credit: Metal Organic Framework by Mike Gipple at NETL

Programmable synthetic materials
Aug 2020, phys.org
In the future, MOFs could form the basis of programmable chemical molecules: for instance, an MOF could be programmed to introduce an active pharmaceutical ingredient into the body to target infected cells and then break down the active ingredient into harmless substances once it is no longer needed. Or MOFs could be programmed to release different drugs at different times.

via University of California Berkeley: Sequencing of metals in multivariate metal-organic frameworks, Science (2020). DOI: 10.1126/science.aaz4304 
Breakthrough technology purifies water using the power of sunlight
Aug 2020, phys.org
Metal-organic frameworks are a class of compounds consisting of metal ions that form a crystalline material with the largest surface area of any material known. In fact, MOFs are so porous that they can fit the entire surface of a football field in a teaspoon.

via Monash University: A sunlight-responsive metal–organic framework system for sustainable water desalination, Nature Sustainability (2020). DOI: 10.1038/s41893-020-0590-x
Study shows promising material can store solar energy for months or years
Dec 2020, phys.org
In tests, the researchers exposed the material to UV light, which causes the azobenzene molecules to change shape to a strained configuration inside the MOF pores. This process stores the energy in a similar way to the potential energy of a bent spring. Importantly, the narrow MOF pores trap the azobenzene molecules in their strained shape, meaning that the potential energy can be stored for long periods of time at room temperature.

The energy is released again when external heat is applied as a trigger to 'switch' its state, and this release can be very quick—a bit like a spring snapping back straight. This provides a heat boost which could be used to warm other materials of devices.

Further tests showed the material was able to store the energy for at least four months. This is an exciting aspect of the discovery as many light-responsive materials switch back within hours or a few days. The long duration of the stored energy opens up possibilities for cross-seasonal storage.

via by Lancaster University: Kieran Griffiths et al, Long-Term Solar Energy Storage under Ambient Conditions in a MOF-Based Solid–Solid Phase-Change Material, Chemistry of Materials (2020). DOI: 10.1021/acs.chemmater.0c02708
Physicists create tunable superconductivity in twisted graphene 'nanosandwich'
Feb 2021, phys.org

Come on with that name though.

via Massachusetts Institute of Technology: Tunable strongly coupled superconductivity in magic-angle twisted trilayer graphene, Nature (2021). DOI: 10.1038/s41586-021-03192-0

Flash graphene rocks strategy for plastic waste
Oct 2020, phys.org
It's called flashing -- expose plastic waste to eight seconds of high-intensity alternating current, followed by the DC jolt. You'll get turbostratic graphene. Yes, graphene from garbage. $125 of electricity turns a ton of plastic into a ton of graphene.
via Rice University: Wala A. Algozeeb et al, Flash Graphene from Plastic Waste, ACS Nano (2020). DOI: 10.1021/acsnano.0c06328
Researchers use origami to solve space travel challenge
Dec 2020, phys.org

Origami bellow-bag fuel storage containers.

via Washington State University: Kjell Westra et al, Compliant Polymer Origami Bellows in Cryogenics, Cryogenics (2020). DOI: 10.1016/j.cryogenics.2020.103226

DNA origami enables fabricating superconducting nanowires
Jan 2021, phys.org
 
via the American Institute of Physics: "DNA origami-based superconducting nanowires" AIP Advances, aip.scitation.org/doi/10.1063/5.0029781

Researchers turn coal powder into graphite in microwave oven
Jan 2021, phys.org
Using copper foil, glass containers and a conventional household microwave oven, University of Wyoming researchers have demonstrated that pulverized coal powder can be converted into higher-value nano-graphite.

"By cutting the copper foil into a fork shape, the sparks were induced by the microwave radiation, generating an extremely high temperature of more than 1,800 degrees Fahrenheit within a few seconds," says Masi, lead author of the paper. "This is why you shouldn't place a metal fork inside a microwave oven."

via University of Wyoming: Christoffer A. Masi et al, Converting raw coal powder into polycrystalline nano-graphite by metal-assisted microwave treatment. Nano-Structures & Nano-Objects Volume 25, 2021, 100660, ISSN 2352-507X, doi.org/10.1016/j.nanoso.2020.100660
'Magnetic graphene' forms a new kind of magnetism
Feb 2021, phys.org

via University of Cambridge: Matthew J. Coak et al. 'Emergent Magnetic Phases in Pressure-Tuned van der Waals Antiferromagnet FePS3.' Physical Review X (2021). DOI: 10.1103/PhysRevX.11.011024

A new way to make wood transparent, stronger and lighter than glass
Feb 2021, phys.org
The conventional method for making wood transparent involves using chemicals to remove the lignin—a process that takes a long time, produces a lot of liquid waste and results in weaker wood. In this new effort, the researchers have found a way to make wood transparent without having to remove the lignin.

The process involved changing the lignin rather than removing it. The researchers removed lignin molecules that are involved in producing wood color. First, they applied hydrogen peroxide to the wood surface and then exposed the treated wood to UV light (or natural sunlight). The wood was then soaked in ethanol to further clean it. Next, they filled in the pores with clear epoxy to make the wood smooth.

via University of Maryland: Qinqin Xia et al. Solar-assisted fabrication of large-scale, patternable transparent wood, Science Advances (2021). DOI: 10.1126/sciadv.abd7342
Japan developing wooden satellites to cut space junk
Dec 2020, BBC News