Nanotubes Grown Straight in Large Numbers: related news

Nanotubes Grown Straight in Large Numbers

DURHAM, N.C., April 23 (AScribe Newswire) -- Duke University chemists have found a way to grow long, straight cylinders only a few atoms thick in very large numbers, removing a major roadblock in the pursuit of nano-scale electronics.

First sequence-based map of large-scale structural variation across the human genome

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Nanotubes Grown Straight In Large Numbers

"This would break a logjam for reproducing enough of them in identical form to build into working devices," says lead Duke researcher Jie Liu

Some Nanotubes Could Cause Cancer

Certain types of carbon nanotubes could cause the same health problems as asbestos, according to the results of two recent studies. In one, published yesterday, tests in mice showed that long and straight multiwalled carbon nanotubes cause the same kind of inflammation and lesions in the type of tissues that surround the lungs that is caused by asbestos. The other study, also done in mice, showed that similar carbon nanotubes eventually led to cancerous tumors.

Clarification: Carbon nanotubes study performed on mice

Weekly reported on a new study that shows some potential for carbon nanotubes to behave like asbestos if inhaled. We failed to report, however, that the study was conducted by injecting carbon nanotubes into the abdomen of mice. Conclusions reached about the inhalation risk of carbon nanotubes were made by researchers involved in the project based on results of the injection regime. There is, as yet, no direct evidence that inhalation of carbon nanotubes poses a health risk, and researchers involved in the study acknowledged that more experimentation is required to fully assess inhalation risk.

Passports For Penguins: New Technology Lets Biologists ID Large Numbers Of Endangered Animals

Ground-breaking technology that will enable biologists to identify and monitor large numbers of endangered animals, from butterflies to whales, without being captured, will be shown to the public for the first time at this year's Royal Society Summer Science exhibition [30 June to 3 July].

Nanotubes "As Deadly as Asbestos"

Stony Stevenson writes "Certain carbon nanotubes may be as hazardous to humans as asbestos. A paper to be published in Nature Nanotechnology suggests that inhaling certain types of nanotubes can lead to the formation of mesothelioma, a type of lung cancer commonly caused by exposure to asbestos. "This is a wakeup call for nanotechnology in general and carbon nanotubes in particular," said Andrew Maynard, co-author of the report and chief science adviser to the Project on Emerging Nanotechnologies." I'm really hoping that those medical face masks get popular again. That's a look that should really be cyclic, like bell-bottoms and thongs. Update: 05/21 19:18 GMT by T : See also this page at the Nanotechnology Project, which features a link to video commentary from Andrew Maynard, the researcher mentioned in the above-linked article.

Nanotubes 'As Deadly as Asbestos'

Stony Stevenson writes "Certain carbon nanotubes may be as hazardous to humans as asbestos. A paper to be published in Nature Nanotechnology suggests that inhaling certain types of nanotubes can lead to the formation of mesothelioma, a type of lung cancer commonly caused by exposure to asbestos. "This is a wakeup call for nanotechnology in general and carbon nanotubes in particular," said Andrew Maynard, co-author of the report and chief science adviser to the Project on Emerging Nanotechnologies." I'm really hoping that those medical face masks get popular again. That's a look that should really be cyclic, like bell-bottoms and thongs.

Spin Control: New Technique Sorts Nanotubes by Length

In a schematic of NISTs length separation technique for carbon nanotubes (l.) the nanotubes start at the bottom of a dense fluid. When spun in a centrifuge the nanotubes begin to migrate through the fluid driven by their buoyancy but the longer ones ...

Spin control: New technique sorts nanotubes by length

In a schematic of NIST's length separation technique for carbon nanotubes (l.), the nanotubes start at the bottom of a dense fluid. When spun in a centrifuge, the nanotubes begin...

Spin control: New technique sorts nanotubes by length

In a schematic of NIST's length separation technique for carbon nanotubes (l.), the nanotubes start at the bottom of a dense fluid. When spun in a centrifuge, the nanotubes begin...

Spin Control: New Technique Sorts Nanotubes by Length

In a schematic of NIST's length separation technique for carbon nanotubes (l.), the nanotubes start at the bottom of a dense fluid. When spun in a centrifuge, the nanotubes begin to migrate through the fluid driven by their buoyancy, but the longer ones move faster, spreading them out by length. Photos (r.) shows a typical sample at the start and after 94 hours of spinning at 1257 radians per second (roughly 12,000 RPM). Credit: NIST

Nanochemistry inside carbon nanotubes

(Nanowerk Spotlight) As far as test tubes go, it doesn't get any smaller than a single-walled carbon nanotube (SWCNT). Among the wide range of interesting properties exhibited by SWCNTs is their capacity to encapsulate molecules within their quasi one-dimensional cavity. The confinement offered by the nanotube could serve as a nanoscale test tube to constrain a chemical reaction. This was demonstrated in principle back in 1998, when the coalescence of adjacent fullerenes was observed by transmission electron microscopy ("Encapsulated C60 in carbon nanotubes"). In the following years, scientists have extensively experimented with filling nanotubes with other fullerenes, atoms, molecules and, very recently, with organic molecules. Owing to their large variety with diverse chemical properties, the incorporated organic molecules can tune the

Spin Control: New Technique Sorts Nanotubes By Length

Researchers at the National Institute of Standards and Technology (NIST) have reported a new technique to sort batches of carbon nanotubes by length using high-speed centrifuges. Many potential applications for carbon nanotubes depend on the lengths of these microscopic cylinders, and one of the most important features of the new technique, say the scientists, is that it should be easily scalable to produce industrial quantities of high-quality nanotubes.

Spin control: New technique sorts nanotubes by length

(Nanowerk News) Researchers at the National Institute of Standards and Technology (NIST) have reported* a new technique to sort batches of carbon nanotubes by length using high-speed centrifuges. Many potential applications for carbon nanotubes depend on the lengths of these microscopic cylinders, and one of the most important features of the new technique, say the scientists, is that it should be easily scalable to produce industrial quantities of high-quality nanotubes.

The role of surfactants in carbon nanotube toxicity

(Nanowerk Spotlight) Synthesized carbon nanotubes, especially single-walled carbon nanotubes (SWCNTs), are in the form of bundles with other impurities such as catalyst particles and amorphous carbon debris. In order to be useful for many types of applications, for instance in nanoelectronic devices or biomedical applications, SWCNTs need to be purified and dispersed into individual nanotubes. One method to do this is by surfactant stabilization of the hydrophobic nanotube surface, which overcomes the van der Waals forces among the nanotubes and results in suspensions of individual SWCNTs.

Nanotubes form sensitive sensors

carbon nanotubes, ultra microelectrodes Researchers in the University of Warwick’s Department of Chemistry have found a way of producing carbon nanotubes such that they instantly form a highly sensitive ready made electric circuit.

Carbon nanotubes behave like asbestos

Long straight carbon nanotubes may be as dangerous as asbestos fibres, potentially causing cancer in cells lining the lung, a pilot study in mice has shown.

Some Nanotubes Could Cause Cancer

Dangerous nanotubes: The long, multiwalled carbon nanotubes shown here can lead to inflammation, lesions, and cancer when they come in contact with mesothelial tissues that surround organs in the body, according to new studies performed on mice. (Scale bar is 20 micrometers.)

Carbon Nanotubes as a Single-Photon Source

Carbon nanotubes, as true multi-purpose materials, have potential applications in everything from electrical circuits and drug delivery to golf clubs and space elevators. Recently, physicists have investigated single-walled carbon nanotubes (CNTs) for one more use: as a single-photon source, where they could help make quantum communication networks extremely secure and efficient.

Carbon Nanotubes Could Be Toxic

Strong, versatile little "nanotubes" made out of carbon are considered future stars in nanotechnology research in medicine and industry. Now a study finds that longer threads of the stuff mimic the toxic qualities of asbestos, renewing questions about how carbon nanotubes can be used safely.

Carbon nanotubes mimic asbestos in early study

Strong, versatile little "nanotubes" made out of carbon are considered future stars in nanotechnology research in medicine and industry. Now a study finds that longer threads of the stuff mimic the toxic qualities of asbestos, renewing questions about how carbon nanotubes can be used safely.

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