A solution containing acid-oxidized single-wall nanotubes graphene oxide and ethylenediamine which promotes synthesis and dopes graphene with nitrogen is pumped through a flexible narrow reinforced tube called a capillary column and heated in an oven for six hours.
#Pillared Graphene structures Gain Strength, Toughness and Ductility In a newly published study, scientists from Rice university reveal that putting nanotube pillars between sheets of graphene could create hybrid structures with a unique balance of strength, toughness
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,
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
Turning the nanotubes in a way that forced wrinkles in the graphene sheets added further flexibility and shear compliance,
The idea is to mix nanotubes into a fluid to create a slurry, lay down a film just a few micrometers thick on a suitable substrate,
The heat-generating resistance comes mainly from the passage of current through gaps between the nanotubes.
have constructed previously nanotubes using a method that relies on spontaneous assembly of DNA in solution.
we can now build long nanotubes block by block, said Amani Hariri, a Phd student in Mcgill Department of chemistry and lead author of the study. y using a fluorescence microscope we can further visualize the formation of the tubes at each stage of assembly,
The custom-built assembly technique developed through this collaboration ives us the ability to monitor the nanotubes as wee building them,
The resulting esigner nanotubes she adds, promise to be far cheaper to produce on a large scale than those created with so-called DNA origami,
The Organic Bio-Based Motor oil patent describes the assembly process for blending Nanotubes and various highly viscous all natural plant oils to form Nanosave N1-Organic.
When the light waves strike the nanotube antennas, an oscillating charge is created that travels through the rectifier devices.
Atomic layer chemical vapour deposition was used to in sulate the nanotubes with a coating of aluminum oxide.
Optically transparent thin calcium layers were deposited then using physical vapor deposition over the nanotube forest.
which is sufficient for ejecting electrons out of the carbon nanotube antennas upon the absorption of visible light Light in the form of oscillating waves interacts with nanotubes after going through the calcium-aluminum electrode.
The nanotube tips have metal-insulator-metal junctions that work as rectifiers. These rectifiers switch on and off at time intervals in the femtosecond range.
Putting pressure on the skin squeezes the nanotubes closer together and enables them to conduct electricity.
As such, the researchers developed a method to grow nanotubes in narrow grooves, guiding the nanotubes into alignment.
But there was another hurdle. While 99.5 percent of the nanotubes become aligned, a few stragglers will still be out of position.
To solve this problem, the researchers figured out that drilling holes at certain spots within the chip can ensure that even a chip with wayward tubes would work as expected.
leaving huge jolts of current to circulate through the remaining conducting nanotubes. The high current heats up and breaks down only the conducting nanotubes,
which blow like nanoscale fuses, Shulaker said. In 2013, the team built a CNT COMPUTER which they described in the journal Nature.
Graphene-nanotube hybrid switches But together, these two materials make a workable digital switch, which is the basis for controlling electrons in computers, phones, medical equipment and other electronics.
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, thin hairs."
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.
the use of graphene and nanotubes bypasses those problems. In addition, the graphene and boron nitride nanotubes have the same atomic arrangement pattern,
With their aligned atoms, the graphene-nanotube digital switches could avoid the issues of electron scattering."
the application of nanotubes and modification of the sample surfaces lead to the production of conductive fabrics with different electrical properties.
Water is replaced by nanotubes It has been known for decades that plants have the extraordinary ability to register extremely fine temperature differences
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,
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,
#Combining graphene and nanotubes to make digital switches Graphene has been called a wonder material, capable of performing great and unusual material acrobatics.
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.
the use of graphene and nanotubes bypasses those problems. In addition, the graphene and boron nitride nanotubes have the same atomic arrangement pattern,
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,
#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,
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
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.
Putting pressure on the plastic squeezes the nanotubes closer together and enables them to conduct electricity.
Increasing pressure on the waffled nanotubes squeezes them even closer together, allowing more electricity to flow through the sensor,
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.
As the waves of light hit the nanotube antennas, they create an oscillating charge that moves through rectifier devices attached to them.
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
Under a strong electric field the cathode emits tight high-speed beams of electrons through its sharp nanotube tips--a phenomenon called field emission.
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
In this setup, the buckled nanotube sheets act as electrodes and the thin rubber coating serves as the dielectric.
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.
#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
"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.
Nanofibers can also be loaded with proteins, nanotubes, fluorescent materials and therapeutic agents.""We can use almost any kind of polymer with this platform,
which the buckled nanotube sheaths serve as electrodes and the thin rubber layer is a dielectric, resulting in a fiber capacitor.
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:
Nanofibers can also be loaded with proteins, nanotubes, fluorescent materials and therapeutic agents.""We can use almost any kind of polymer with this platform,
2015researchers grind nanotubes to get nanoribbons: Rice-led experiments demonstrate solid-state carbon nanotube'templates'June 15th, 2015materials/Metamaterials Designer electronics out of the printer:
"This novel combination of buckling in two dimensions avoids misalignment of nanotube and rubber core directions, enabling the electrical resistance of the sheath-core fiber to be insensitive to stretch."
which the buckled nanotube sheaths serve as electrodes and the thin rubber layer is a dielectric, resulting in a fiber capacitor.
The nanobatteries were fabricated by atomic layer deposition to make oxide nanotubes (for ion storage) inside metal nanotubes for electron transport, all inside each end of the nanopores.
using atomic layer deposition to carefully control thickness and length of multilayer concentric nanotubes as electrodes at each end.
#Researchers grind nanotubes to get nanoribbons (w/video) A simple way to turn carbon nanotubes into valuable graphene nanoribbons may be to grind them,
is to mix two types of chemically modified nanotubes. When they come into contact during grinding,
the new process is still a chemical reaction that depends on molecules purposely attached to the nanotubes, a process called functionalization.
If we can use nanotubes as templates, functionalize them and get reactions under the right conditions,
triggering the nanotubes to unzip into nanoribbons, with water as a byproduct. hat serendipitous observation will lead to further systematic studies of nanotubes reactions in solid state,
including ab initio theoretical models and simulations, Ajayan said. his is exciting. The experiments were duplicated by participating labs at Rice
so the energy enough to break up the nanotubes into ribbons, but the details of the dynamics are difficult to monitor,
Kabbani said. here no way we can grind two nanotubes in a microscope and watch it happen.
several of which they also analyzed. hile the dipole moment is zero for flat graphene or cylindrical nanotubes,
#Discovery of nanotubes offers new clues about cell-to-cell communication When it comes to communicating with each other,
Certain types of stem cells use microscopic, threadlike nanotubes to communicate with neighboring cells, like a landline phone connection, rather than sending a broadcast signal,
"The nanotubes had actually been hiding in plain sight. The investigation began when a postdoctoral researcher in Yamashita's lab,
Until the discovery of the nanotubes, scientists had been puzzled as to how cellular signals guiding identity could act on one of the cells
The researchers conducted experiments that showed disruption of nanotube formation compromised the ability of the germ line stem cells to renew themselves s
When they tested one conductive gel with the nanotubes and one without, they were able to create a 3d electrical circuit.
Researchers have struggled also to control the placement and alignment of nanotubes. Until now these two challenges have limited the development of high-performance carbon nanotube transistors.
Previous techniques to align the nanotubes resulted in less than-desirable packing density or how close the nanotubes are to one another
when they are assembled in a film. However the UW-Madison researchers pioneered a new technique called floating evaporative self-assembly or FESA
Gopalan and their students reported transistors with an on-off ratio that 1, 000 times better and a conductance that 100 times better than previous state-of-the-art carbon nanotube transistors. arbon nanotubes are very strong and very flexible,
Researchers have struggled also to control the placement and alignment of nanotubes. Until now, these two challenges have limited the development of high-performance carbon nanotube transistors.
Previous techniques to align the nanotubes resulted in less than-desirable packing density, or how close the nanotubes are to one another
when they are assembled in a film. However, the UW-Madison researchers pioneered a new technique,
several of which they also analyzed. hile the dipole moment is zero for flat graphene or cylindrical nanotubes,
#Crowd-sourced computing reveals how to make better water filters with nanotubes Crowd-sourced computing has helped an international research team including researchers from the University of Sydney discover a new method of improving water filtration systems and water quality.
Nanotube inflitration in actionthe team enlisted more than 150,000 computer volunteers worldwide to conduct the research.
the Computing for Clean water project was able to expand these simulations to probe flow rates of just a few centimeters per second characteristic of the working conditions of real nanotube-based filters,
which will become essential to analyze the massive data generated by the volunteered computers. y simulating water molecules flowing through nanotubes we have shown how vibrations result in oscillating friction,
Liu said. his novel combination of buckling in two dimensions avoids misalignment of nanotube and rubber core directions, enabling the electrical resistance of the sheath-core fiber to be insensitive to stretch.
which the buckled nanotube sheaths serve as electrodes and the thin rubber layer is a dielectric,
Now, researchers at Rice university in the US have found a new way of producing the material by grinding modified nanotubes with a mortar and pestle.
According to materials scientist Pulickel Ajayan this breakthrough reported in the current issue of Nature Communications-has been achieved by mixing two types of chemically modified nanotubes which,
The team claims that the new process could lead to significant advances in nanomaterials development. f we can use nanotubes as templates,
triggering the nanotubes to unzip into nanoribbons, with water as a byproduct. The experiments were duplicated by participating labs at Rice, at the Indian Institute of technology and at the Lebanese American University in Beirut.
so the energy enough to break up the nanotubes into ribbons, but the details of the dynamics are difficult to monitor,
Beirut. here no way we can grind two nanotubes in a microscope and watch it happen.
< Back - Next >
Overtext Web Module V3.0 Alpha
Copyright Semantic-Knowledge, 1994-2011