That said, there are other studies that support a toxic role for carbon nanotubes.
My awareness of the toxicity of carbon nanotubes is that the jury is out.
In theory, bacteria could eventually develop resistance to a drug made of such nanotubes.
Clumping can potentially cause shorts and otherwise prevent the nanotubes from enhancing the electrical conversion.
It has been thought for some time that carbon nanotubes might be able to do it.
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In September, the company announced that it would also produce nanotubes made of this material.
The conductivity of carbon nanotubes, by contrast, depends critically on size, shape and twistiness.
There has been some progress with materials that can do this, including specially engineered carbon nanotubes.
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Though the carbon nanotubes absorb infra-red light, they are almost totally transparent to the visible variety.
In effect, nanotubes act as wires a few billionths of a metre in diameter.
Some researchers are working on sponges made of carbon nanotubes that soak up hydrogen.
Carbon nanotubes have alluring properties, sometimes acting like semiconductors, other times like conductors.
But it's Friday, and this here story has real-live carbon nanotubes, so you know it's a winner.
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Carbon nanotubes and nanofibres, however, seem to be able to absorb hydrogen well, even at room temperature.
"I found out about nanotubes and then I came across some MIT research into nano-manufacturing, " he explained.
This material, he says, has the advantage that its nanotubes are semiconductors regardless of their size and shape.
Craig Grimes, a materials scientist at Pennsylvania State University, has been working on nanotubes made of titanium compounds.
Nanotubes are like rolled up sheets, while nanofibres consist of tall stacks of small sheets in various configurations.
Carbon nanotubes are microscopic tubes comprised entirely of carbon, which have different chemical properties useful to solar cells.
Namely, that nanotubes can act as semiconductors, enhancing the ability of solar cells to convert sunlight to electricity.
If a gas has bound to the the nanotubes it will impede the electron flow, altering the current.
The technique takes advantage of the fact that ammonia binds to the nanotubes when it passes through them.
Think nanotubes of atoms, coated in titanium, a billionth of a meter thick, say the Yale and Rice teams.
Carbon nanotubes are not fully tested in medical applications, but should be inert.
Many have tried, and failed, to use carbon nanotubes to do these jobs.
Scientists get both types when they make a batch of carbon nanotubes.
Inorganic nanotubes, he says, are easy to manufacture in large quantities something that still eludes the makers of the carbon version.
To create his test, Jack mixed human mesothelin-specific antibodies with carbon nanotubes and coated strips of ordinary filter paper.
As a result there is very little scattering of light as it passes from the air into the layer of nanotubes.
It works using a mesh made from a combination of tiny carbon cylinders -- known as nanotubes -- and silver wire.
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