We have fabricated also Li-ion batteries based on structurally resilient carbon nanotube-based electrodes that have survived thousands of flexing cycles.
#Carbon nanotubes Applied to Create Electrical conductivity in Woolen Fabrics The fabrics can be used in various industries,
Researchers have tried in this research to synthesize fabrics with new properties by using simple and modified carbon nanotubes.
the application of nanotubes and modification of the sample surfaces lead to the production of conductive fabrics with different electrical properties.
Carbon nanotubes have been added to woolen fabrics that are insulators by themselves. Therefore, the product can be presented to the market as a relatively conductive material.
Water is replaced by nanotubes It has been known for decades that plants have the extraordinary ability to register extremely fine temperature differences
These electrically conductive carbon nanotubes formed a network between the tobacco cells and were also able to penetrate the cell walls.
When Di Giacomo dried the nanotube-cultivated cells, he discovered a woody, firm material that he calls'cyberwood'.
'In contrast to wood, this material is electrically conductive thanks to the nanotubes, and interestingly the conductivity is temperature-dependent and extremely sensitive,
Nagoya University and the JST-ERATO Itami Molecular Nanocarbon Project have developed a bulky iridium catalyst that selectively directs a boron moiety to the opposite side of mono-substituted benzene derivatives.
superoleophobic coatings prepared by layer-by-layer technique for anti-smudge and oil-water separation"and"Nanomechanical behavior of Mos2 and WS2 multi-walled nanotubes and Carbon nanohorns").
what happens when a surface is made of nanotubes. Rather than silica, he experiments with molybdenum disulfide nanotubes,
which mix well with oil. The nanotubes are approximately a thousand times smaller than a human hair.
Maharaj measured the friction on the surface of the nanotubes and compressed them to test how they would hold up under pressure."
"There are natural defects in the structure of the nanotubes, "he said.""And under high loads, the defects cause the layers of the tubes to peel apart
and create a slippery surface, which greatly reduces friction.""Bhushan envisions that the molybdenum compound's compatibility with oil,
Here, he suspects that the molybdenum nanotubes alone could be used to reduce friction. This work began more than 10 years ago,
#Carbon nanotube sensor detects spoiled meat MIT chemists have devised an inexpensive, portable sensor that can detect gases emitted by rotting meat,
which consists of chemically modified carbon nanotubes, could be deployed in"smart packaging"that would offer much more accurate safety information than the expiration date on the package,
This MIT device, based on modified carbon nanotubes, can detect amines produced by decaying meat. It could also cut down on food waste
who is the senior author of a paper describing the new sensor this week in the journal Angewandte Chemie("Single-Walled carbon nanotube/Metalloporphyrin Composites for the Chemiresistive Detection of Amines and Meat Spoilage").
The sensor is similar to other carbon nanotube devices that Swager's lab has developed in recent years,
Carbon nanotubes can be modified chemically so that their ability to carry an electric current changes in the presence of a particular gas.
In this case, the researchers modified the carbon nanotubes with metal-containing compounds called metalloporphyrins, which contain a central metal atom bound to several nitrogen-containing rings.
it increases the electrical resistance of the carbon nanotube, which can be measured easily.""We use these porphyrins to fabricate a very simple device where we apply a potential across the device
and could be incorporated into a wireless platform Swager's lab recently developed that allows a regular smartphone to read output from carbon nanotube sensors such as this one.
#Combining graphene and nanotubes to make digital switches Graphene has been called a wonder material, capable of performing great and unusual material acrobatics.
Boron nitride nanotubes are no slackers in the materials realm either, and can be engineered for physical and biological applications.
or stopping themhile boron nitride nanotubes are so insulating that electrons are rebuffed like an overeager dog hitting the patio door.
Yoke Khin Yap, a professor of physics at Michigan Technological University, has worked with a research team that created these digital switches by combining graphene and boron nitride nanotubes.
The journal Scientific Reports recently published their work("Switching Behaviors of Graphene-Boron nitride nanotube Heterojunctions"."he question is:
the nanotubes are made like straws of boron and nitrogen. Yap and his team exfoliate graphene
Then they can grow the nanotubes up and through the pinholes. Meshed together like this, the material looks like a flake of bark sprouting erratic,
and the atomic structure in the nanotubes halts electric currents. This disparity creates a barrier, caused by the difference in electron movement as currents move next to and past the hairlike boron nitride nanotubes.
These points of contact between the materialsalled heterojunctionsre what make the digital on/off switch possible. magine the electrons are like cars driving across a smooth track,
the use of graphene and nanotubes bypasses those problems. In addition, the graphene and boron nitride nanotubes have the same atomic arrangement pattern,
or lattice matching. With their aligned atoms, the graphene-nanotube digital switches could avoid the issues of electron scattering. ou want to control the direction of the electrons,
Yap explains, comparing the challenge to a pinball machine that traps, slows down and redirects electrons. his is difficult in high speed environments,
#Pillared graphene gains strength Rice university researchers discovered that putting nanotube pillars between sheets of graphene could create hybrid structures with a unique balance of strength, toughness and ductility throughout all three dimensions.
Carbon nanomaterials are common now as flat sheets, nanotubes and spheres, and theye being eyed for use as building blocks in hybrid structures with unique properties for electronics,
particularly between carbon nanotubes and graphene, would affect the final hybrid properties in all directions. They found that introducing junctions would add extra flexibility
"Carbon nanotubes are rolled-up arrays of perfect hexagons of atoms; graphene is a rolled out sheet of the same.
the way the atoms are arranged can influence all those properties. ome labs are actively trying to make these materials or measure properties like the strength of single nanotubes and graphene sheets,
and quantitatively predict the properties of hybrid versions of graphene and nanotubes. These hybrid structures impart new properties
and functionality that are absent in their parent structures graphene and nanotubes. To that end the lab assembled three-dimensional computer models of illared graphene nanostructures, akin to the boron nitride structures modeled in a previous study to analyze heat transfer between layers. his time we were interested in a comprehensive understanding of the elastic and inelastic properties
Shahsavari said. e compared our 3-D hybrid structures with the properties of 2-D stacked graphene sheets and 1-D carbon nanotubes.
The latter allows pillared graphene to exhibit remarkable toughness along out-of-plane directions, a feature that is not possible in 2-D stacked graphene sheets or 1-D carbon nanotubes,
Turning the nanotubes in a way that forced wrinkles in the graphene sheets added further flexibility and shear compliance,
The Berkeley Lab scientists say this never-before-seen design rule could be used to piece together complex nanosheet structures and other peptoid assemblies such as nanotubes and crystalline solids.
next-generation health monitoring devices such as electronic stick-on tattoos (see for instance"wearing single-walled carbon nanotube electronics on your skin",a"temporary tattoo to monitor glucose levels"or"graphene nanosensor tattoo
"Some researchers have wanted to make transistors out of carbon nanotubes but the problem is that they grow in all sorts of directions,
Meanwhile, researchers are working to enhance the performance of lithium-ion batteries using materials like carbon nanotubes,
and bound them in carbon nanotubes. When the molecules are present, the carbon nanotubes light up. In tests, the researchers found that their device could detect GSM and MIB concentrations as low as 10 nanograms per liter of water,
or 10,000 parts per trillion. That's not quite as sensitive as the human nose, which can detect GSM at just 5 parts per trillion,
"Some researchers have wanted to make transistors out of carbon nanotubes, but the problem is that they grow in all sorts of directions,
the team scattered billions of carbon nanotubes through the waffled plastic. Putting pressure on the plastic squeezes the nanotubes closer together
and enables them to conduct electricity. This allowed the plastic sensor to mimic human skin,
Increasing pressure on the waffled nanotubes squeezes them even closer together, allowing more electricity to flow through the sensor,
Thus, on the sensors, the team used carbon nanotubes molded into pyramidal microstructures, which are particularly effective at tunneling the signals from the electric field of nearby objects to the receiving electrode in a way that maximizes sensitivity.
#Future electronics based on carbon nanotubes First of all they are tiny--on the atomic scale and perhaps near the physical limit of how small you can shrink a single electronic switch.
But a big barrier to building useful electronics with carbon nanotubes has always been the fact that
"Now Rogers and a team of researchers have shown how to strip out the metallic carbon nanotubes from arrays using a relatively simple,
aligned arrays of carbon nanotubes packed with good densities on thin films has largely been solved by several different groups of scientists in recent years,
they were able to deposit a thin coating of organic material directly on top of a sheet of arrayed nanotubes in contact with a sheet of metal.
which allowed the current to flow through the nanotubes that were metal conductors--but not the bulk of the tubes,
The current heated up the metal nanotubes a tiny amount--just enough to create a"thermal capillary flow"that opened up a trench in the organic topcoat above them.
This left an electronic wafer coated with semiconducting nanotubes free of metallic contaminants, Rogers said. They tested it by building arrays of transistors
#Taking aircraft manufacturing out of the oven Aerospace engineers at MIT have developed now a carbon nanotube (CNT) film that can heat
"Wardle says the carbon nanotube film is also incredibly lightweight: After it has fused the underlying polymer layers,
Carbon nanotube deicerswardle and his colleagues have experimented with CNT films in recent years, mainly for deicing airplane wings.
carbon nanotubes heat efficiently when exposed to an electric current. The group first developed a technique to create a film of aligned carbon nanotubes composed of tiny tubes of crystalline carbon
standing upright like trees in a forest. The researchers used a rod to roll the"forest"flat,
creating a dense film of aligned carbon nanotubes. In experiments, Wardle and his team integrated the film into airplane wings via conventional,
If the CNT film could generate heat, why not use it to make the composite itself?
The researchers manufactured a CNT film about the size of a Post-it note, and placed the film over a square of Cycom 5320-1. They connected electrodes to the film,
or cross-link, the polymer and carbon fiber layers, finding that the CNT film used one-hundredth the electricity required for traditional oven-based methods to cure the composite.
Wardle says the results pushed the group to test the CNT film further: As different composites require different temperatures in order to fuse,
whether the CNT film could, quite literally, take the heat.""At some point, heaters fry out,
"Gregory Odegard, a professor of computational mechanics at Michigan Technological University, says the group's carbon nanotube film may go toward improving the quality and efficiency of fabrication processes for large composites, such as wings on commercial aircraft.
more conductive carbon nanotube films"It's a simple process and can create a lightweight CNT film,
or'bucky paper,'that is a meter wide and twice as strong as previous such films--it's even stronger than CNT FIBERS,
"says Yuntian Zhu, Distinguished Professor of Materials science and engineering at NC State and corresponding author of a paper describing the work.
The researchers begin by growing the CNTS on a conventional substrate in a closely packed array.
The CNTS are tangled together, so when researchers pull on one end of the array the CNTS form a continuous ribbon that is only nanometers thick.
This ribbon is attached to a spool which begins winding the ribbon up. As the spool pulls, the CNT ribbon is dragged between two surgical blades.
While the blades appear straight to the naked eye, they actually have micrometer-scale fissures on their cutting edge.
These fissures create a kind of"microcomb"that pulls the CNTS into alignment--just as a regular comb sorts through tangled hair.
When the ribbon of aligned CNTS is being wound onto the spool, the researchers apply an alcohol solution.
This pulls the CNTS closer together, strengthening the bonds between CNTS. The CNT ribbon wraps around itself as it winds around the spool
creating a layered film of pure CNTS. Researchers can control the thickness of the film by controlling the number of layers.
The CNT films made using the microcombing technique had more than twice the tensile strength of the uncombed CNT films--greater than 3 gigapascals for the microcombed material,
versus less than 1. 5 gigapascals for the uncombed material. The microcombed CNT film also had 80 percent higher electrical conductivity than the uncombed film."
"This is a significant advance, but we want to find ways to make CNT alignment even straighter,
"Zhu says.""It's still not perfect.""In addition, the technique would theoretically be easy to scale up for large-scale production.
The pressure sensors are made of a carbon nanotube-elastomer composite shaped into tiny pyramidal structures that are coated onto a surface.
#icrocombingcreates Stronger, More Conductive Carbon nanotube Films Researchers from North carolina State university and China Suzhou Institute of Nanoscience and Nano-Biotics have developed an inexpensive technique called icrocombingto align carbon nanotubes (CNTS),
pure CNT films that are stronger than any previous such films. The technique also improves the electrical conductivity that makes these films attractive for use in electronic
and aerospace applications. t a simple process and can create a lightweight CNT film, or ucky paper, that is a meter wide and twice as strong as previous such films it even stronger than CNT FIBERS,
says Yuntian Zhu, Distinguished Professor of Materials science and engineering at NC State and corresponding author of a paper describing the work.
The researchers begin by growing the CNTS on a conventional substrate in a closely packed array.
The CNTS are tangled together, so when researchers pull on one end of the array the CNTS form a continuous ribbon that is only nanometers thick.
This ribbon is attached to a spool, which begins winding the ribbon up. As the spool pulls, the CNT ribbon is dragged between two surgical blades.
While the blades appear straight to the naked eye they actually have micrometer-scale fissures on their cutting edge.
These fissures create a kind of icrocombthat pulls the CNTS into alignment just as a regular comb sorts through tangled hair.
When the ribbon of aligned CNTS is being wound onto the spool, the researchers apply an alcohol solution.
This pulls the CNTS closer together, strengthening the bonds between CNTS. The CNT ribbon wraps around itself as it winds around the spool,
creating a layered film of pure CNTS. Researchers can control the thickness of the film by controlling the number of layers.
The CNT films made using the microcombing technique had more than twice the tensile strength of the uncombed CNT films greater than 3 gigapascals for the microcombed material
versus less than 1. 5 gigapascals for the uncombed material. The microcombed CNT film also had 80 percent higher electrical conductivity than the uncombed film. his is a significant advance,
but we want to find ways to make CNT alignment even straighter, Zhu says. t still not perfect. n addition,
the technique would theoretically be easy to scale up for large-scale production. We like to find an industry partner to help us scale this up
Based on multiwall carbon nanotubes and tiny rectifiers fabricated onto them, the optical rectennas could provide a new technology for photodetectors that would operate without the need for cooling,
the carbon nanotubes act as antennas to capture light from the sun or other sources. As the waves of light hit the nanotube antennas,
they create an oscillating charge that moves through rectifier devices attached to them. The rectifiers switch on
Using metallic multiwall carbon nanotubes and nanoscale fabrication techniques, Cola and collaborators Asha Sharma, Virendra Singh and Thomas Bougher constructed devices that utilize the wave nature of light rather than its particle nature.
Fabricating the rectennas begins with growing forests of vertically-aligned carbon nanotubes on a conductive substrate.
the nanotubes are coated with an aluminum oxide material to insulate them. Finally, physical vapor deposition is used to deposit optically-transparent thin layers of calcium then aluminum metals atop the nanotube forest.
The difference of work functions between the nanotubes and the calcium provides a potential of about two electron volts
enough to drive electrons out of the carbon nanotube antennas when they are excited by light. In operation, oscillating waves of light pass through the transparent calcium-aluminum electrode
and interact with the nanotubes. The metal-insulator-metal junctions at the nanotube tips serve as rectifiers switching on and off at femtosecond intervals,
allowing electrons generated by the antenna to flow one way into the top electrode. Ultra-low capacitance, on the order of a few attofarads, enables the 10-nanometer diameter diode to operate at these exceptional frequencies. rectenna is basically an antenna coupled to a diode
but when you move into the optical spectrum, that usually means a nanoscale antenna coupled to a metal-insulator-metal diode,
opening the carbon nanotubes to allow multiple conduction channels, and reducing resistance in the structures. e think we can reduce the resistance by several orders of magnitude just by improving the fabrication of our device structures,
Nanocarbon architectures derived from biological materials such as mushrooms can be considered a green and sustainable alternative to graphite-based anodes,
Brighter, new energy saving flat panel lights based on carbon nanotubes Even as the 2014 Nobel prize in Physics has enshrined light emitting diodes (LEDS) as the single most significant and disruptive energy-efficient lighting solution of today scientists
Electronics based on carbon especially carbon nanotubes (CNTS) are emerging as successors to silicon for making semiconductor materials.
Scientists from Tohoku University in Japan have developed a new type of energy-efficient flat light source based on carbon nanotubes with very low power consumption of around 0. 1 Watt for every hour's operation
and optimization of the device which is based on a phosphor screen and single-walled carbon nanotubes as electrodes in a diode structure.
They assembled the device from a mixture liquid containing highly crystalline single-walled carbon nanotubes dispersed in an organic solvent mixed with a soap-like chemical known as a surfactant.
The new devices have luminescence systems that function more like cathode ray tubes with carbon nanotubes acting as cathodes
Under a strong electric field the cathode emits tight high-speed beams of electrons through its sharp nanotube tips--a phenomenon called field emission.
We have found that a cathode with highly crystalline single-walled carbon nanotubes and an anode with the improved phosphor screen in our diode structure obtained no flicker field emission current and good brightness homogeneity Shimoi said.
In recent years carbon nanotubes have emerged as a promising material of electron field emitters owing to their nanoscale needle shape and extraordinary properties of chemical stability thermal conductivity and mechanical strength.
Highly crystalline single-walled carbon nanotubes (HCSWCNT) have nearly zero defects in the carbon network on the surface Shimoi explained.
The resistance of cathode electrode with highly crystalline single-walled carbon nanotube is very low. Thus the new flat-panel device has compared smaller energy loss with other current lighting devices
Many researchers have attempted to construct light sources with carbon nanotubes as field emitter Shimoi said. But nobody has developed an equivalent and simpler lighting device.
Naturally found in a spherical shape NTU Singapore developed a simple method to turn titanium dioxide particles into tiny nanotubes that are a thousand times thinner than the diameter of a human hair.
However Prof Chen's new cross-linked titanium dioxide nanotube-based electrodes eliminate the need for these additives
Manufacturing this new nanotube gel is very easy Prof Chen added. Titanium dioxide and sodium hydroxide are mixed together and stirred under a certain temperature.
atom-thick strips of carbon created by splitting nanotubes, a process also invented by the Tour lab
Among nanomaterials, carbon-based nanoparticles such as carbon nanotubes and graphene have shown promising results, but they suffer from relatively low electrical conductivity,
Other groups have made similar supercapacitors using carbon nanotubes or other materials, but the niobium yarns are stronger and 100 times more conductive.
Overall, niobium-based supercapacitors can store up to five times as much power in a given volume as carbon nanotube versions.
and carbon nanotubes that could be woven into clothing. At the time these fibers were said to obtain the highest volumetric energy density reported for carbon-based microscale supercapacitors (6. 3 microwatt-hours per cubic millimeter,
However carbon nanotubes are still expensive not to mention the fact that there is still some debate about their possible toxicity.
The fiber, made from sheets of carbon nanotubes wrapped around a rubber core, can be stretched to 14 times its original length
In research published in the journal Science, the team describes how they devised a method for wrapping electrically conductive sheets of carbon nanotubes around the rubber core in such a way that the fiber's resistance doesn change when stretched,
but its conductivity increases. e make the inelastic carbon nanotube sheaths of our sheath-core fibers super stretchable by modulating large buckles with small buckles,
and then another carbon nanotube sheath to create strain sensors and artificial muscles. In this setup, the buckled nanotube sheets act as electrodes
and the thin rubber coating serves as the dielectric. Voilà! You have a fiber capacitor. his technology could be well-suited for rapid commercialization,
The only exotic component is the carbon nanotube aerogel sheet used for the fiber sheath
#The First White Laser Scientists and engineers at Arizona State university, in Tempe, have created the first lasers that can shine light over the full spectrum of visible colors.
such as fullerenes or nanotubes, provided they are biocompatible and nontoxic. Previous studies have revealed that gold and platinum nanoparticles produce a large number of electrons via the plasmon excitation mechanism.
#Carbon nanotube-Based Water Desalination and Purification Technology Awarded Patent Mitra's new carbon nanotube immobilized membrane (CNIM) is an energy-efficient device designed to filter higher concentrations of salt than is currently feasible through reverse osmosis, one of the standard
Mitra, who has conducted research on carbon nanotubes for the past 15 years created a novel architecture for the membrane distillation process by immobilizing carbon nanotubes,
which are an atom thick and about 10,000 times smaller than a human hair in diameter, in the membrane pores.
"One of the key characteristics of carbon nanotubes is their capacity to both rapidly absorb water vapor as well as industrial contaminants,
#Vibrations of Water-Carrying Nanotubes for Improved Water filtration Systems Together, unsafe drinking water and the inadequate supply of water for hygiene purposes contribute to almost 90%of all deaths from diarrheal diseases
The research project involves the minute vibrations of carbon nanotubes called"phonons, "which greatly enhance the diffusion of water through sanitation filters.
"Through phonon oscillations--vibrations of water-carrying nanotubes--water transport can be enhanced, and sanitation and desalination improved.
such vibrations produce a 300%improvement in the rate of water diffusion by using computers to simulate the flow of water molecules flowing through nanotubes.
or energy conservation, e g. membranes with boron nitride nanotubes. Crowdsourcing the solutionthe project, initiated by IBM's World Community Grid,
Nanofibers can also be loaded with proteins, nanotubes, fluorescent materials and therapeutic agents.""We can use almost any kind of polymer with this platform,
Wrapping carbon nanotube sheets into fibers In a study published in the July 24 issue of the journal Science,
electrically conductive sheets of tiny carbon nanotubes to form a jellyroll-like sheath around a long rubber core.
senior author of the paper and director of the Alan G. Macdiarmid Nanotech Institute at UT Dallas. One key to the performance of the new conducting elastic fibers is the introduction of buckling into the carbon nanotube
the Robert A. Welch Distinguished Chair in Chemistry at UT Dallas. e make the inelastic carbon nanotube sheaths of our sheath-core fibers super stretchable by modulating large buckles with small buckles,
Radical electronic and mechanical devices possible By adding a thin overcoat of rubber to the sheath-core fibers and then another carbon nanotube sheath
which the buckled nanotube sheaths serve as electrodes and the thin rubber layer is a dielectric, resulting in a fiber capacitor.
she said. he only exotic component is the carbon nanotube aerogel sheet used for the fiber sheath. o
Unlike their predecessors, the team at IBS stayed away from things like carbon nanotubes and gold and looked at a more utilitarian option for their build material:
Professor Cronin's research spans a broad range of topics including electrical and spectroscopic characterization of carbon nanotubes, graphene,
2015researchers turn unzipped nanotubes into possible alternative for platinum: Aerogel catalyst shows promise for fuel cells March 2nd, 2015simulating superconducting materials with ultracold atoms:
2015researchers turn unzipped nanotubes into possible alternative for platinum: Aerogel catalyst shows promise for fuel cells March 2nd, 2015scientific breakthrough in rechargeable batteries:
Grafysorber embodies the nanocarbon paradox Giulio Cesareo, Directa Plus President and CEO, commented in fact with a nanocarbon material we are able to cut down part of damages caused by hydrocarbons,
derived from carbon itself. Moreover, our product, once exhausted after depuration of water, finishes positively its life cycle inside the asphalt and bitumen, introducing new properties as thermal conductivity and mechanical reinforcement.
Overtext Web Module V3.0 Alpha
Copyright Semantic-Knowledge, 1994-2011