flexo
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Carbon Nanotubes - What Is The Status?

Sun Sep 21, 2008 3:12 pm

A couple of years back it seemed that carbon nanotube mass production was just around the corner and we could expect buildings, cars, aircraft, etc. would benefit from the new material in the close future.

Now I haven't heard much about it any more, does anyone know what the current status is? Are any projects worth mentioning on the way?
 
ArmitageShanks
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RE: Carbon Nanotubes - What Is The Status?

Sun Sep 21, 2008 3:22 pm

I don't know anything more than this but I heard there was some worry that they might be carcinogenic and they were doing further studies on them.
 
2H4
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RE: Carbon Nanotubes - What Is The Status?

Sun Sep 21, 2008 3:32 pm

Carbon nanotube technology is being used in bicycle frames and equipment.

2H4
Intentionally Left Blank
 
flexo
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RE: Carbon Nanotubes - What Is The Status?

Sun Sep 21, 2008 5:19 pm



Quoting 2H4 (Reply 2):
Carbon nanotube technology is being used in bicycle frames and equipment.

Interesting, I suppose you are talking about professional "Tour de France" style bicyles? Do you know which manufacturers are using them?
 
StarAC17
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RE: Carbon Nanotubes - What Is The Status?

Sun Sep 21, 2008 8:28 pm

I supposed the biggest reason that is not used as widely right now is the immense cost of producing them.
Engineers Rule The World!!!!!
 
johns624
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RE: Carbon Nanotubes - What Is The Status?

Sun Sep 21, 2008 10:01 pm



Quoting Flexo (Reply 3):
I suppose you are talking about professional "Tour de France" style bicyles

Actually, many of the TdF bikes are available to Joe Public off the shelf. They generally run in the $6-10K range.
 
Klaus
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RE: Carbon Nanotubes - What Is The Status?

Mon Sep 22, 2008 3:40 am

Tubes made from carbon fiber are a compleely different thing from nanotubes.
 
2H4
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RE: Carbon Nanotubes - What Is The Status?

Mon Sep 22, 2008 4:15 am



Quoting Flexo (Reply 3):
Interesting, I suppose you are talking about professional "Tour de France" style bicyles?

Yes. Due to the expense involved in production, nanotube use is currently limited to top-of-the-line frames and components.

Quoting Flexo (Reply 3):
Do you know which manufacturers are using them?

The only frame manufacturer I know of is BMC. Their nanotube frame was first used in the Tour back in 2005. They use tubing from Easton, whom I believe has some kind of patent on nanotube technology in the bicycle industry. They source their carbon nanotube material from Zyvex.

Easton uses nanotube technology to produce handlebars, seatposts, cranksets, forks, and stems.

Quoting Johns624 (Reply 5):

Actually, many of the TdF bikes are available to Joe Public off the shelf.

Yes, indeed. The Trek Madone frames used in the Tour, Vuelta, Giro, etc are totally stock frames, pulled from regular production runs.

Quoting StarAC17 (Reply 4):
I supposed the biggest reason that is not used as widely right now is the immense cost of producing them.

Patents might be restricting widespread use in some industries, and I know there's some concern about carcinogen exposure when the material is cut.

Quoting Klaus (Reply 6):
Tubes made from carbon fiber are a completely different thing from nanotubes.

Nanotubes are an ingredient that can be added to the resin used in carbon fiber to strengthen it. Nanotubes are to carbon fiber resin what steel rebar is to reinforced concrete.

2H4
Intentionally Left Blank
 
NoWorries
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RE: Carbon Nanotubes - What Is The Status?

Mon Sep 22, 2008 12:41 pm

There's also a fair amount of interest in the electronics industry. Nanotube structures can be specifically designed (via their shape) to have various conductor or semiconductor properties.

There are countless potential uses, but just as an example -- one of the problems with monolithic silicon ICs is that silicon junctions have a fixed forward voltage drop of roughly 0.5 volts -- meaning that it's very difficult to run a digital circuit much below 1 Volt. While their design can be tweaked here and there, it's tough to significantly lower the operating voltage. Nanotube transistors on the other hand can operate at very low voltages, reducing power consumption (and heat generation). I'm not sure if all of the kinks have been worked out to where they're economically viable -- but this is just one area where there's significant potential.
 
flexo
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RE: Carbon Nanotubes - What Is The Status?

Tue Sep 23, 2008 7:16 pm



Quoting NoWorries (Reply 8):
but this is just one area where there's significant potential.

I didn't know they were also planning on using nanotubes for electronics. Do you know of specific projects / planned products in this area?
 
MD11Engineer
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RE: Carbon Nanotubes - What Is The Status?

Tue Sep 23, 2008 8:30 pm

Every time you'll light a soothy acetylene flame, you'll get plenty of carbon nanotubes and buckminster-fullerenes.

Jan
Je Suis Charlie et je suis Ahmet aussi
 
NoWorries
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RE: Carbon Nanotubes - What Is The Status?

Tue Sep 23, 2008 9:09 pm



Quoting Flexo (Reply 9):
I didn't know they were also planning on using nanotubes for electronics. Do you know of specific projects / planned products in this area?

There's tons of activity -- just google nanotube, transistor, etc.

Just a sample:

http://www.eetimes.com/news/latest/s...wArticle.jhtml?articleID=210200443

http://www.spectrum.ieee.org/aug04/4196
 
Blackbird
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RE: Carbon Nanotubes - What Is The Status?

Wed Sep 24, 2008 12:11 am

How much of a benefit do those semi-conducting nanotubes provide over current silicon chips? 10x, 100x, 1,000x, 10,000x etc...

BTW: Is the Light-Emitting Nanotube like a microscopic-scale fiber-optic system?


Blackbird
 
NoWorries
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RE: Carbon Nanotubes - What Is The Status?

Wed Sep 24, 2008 12:52 pm



Quoting Blackbird (Reply 12):
How much of a benefit do those semi-conducting nanotubes provide over current silicon chips? 10x, 100x, 1,000x, 10,000x etc...

It's difficult to say -- nanotubes still have some of the same limitations that silicon devices do -- for example, the limits of the manufacturing process in making small features, as device size decreases quantum effects such as tunneling start to occur, etc. Their main benefits will likely be greater ability to custom-tune a device (transistor, diode, etc) to a specific situation, and the ability to handle power more efficiently.

From a broader perspective, as silicon starts to reach it's limits, manufacturers are looking at alternatives to silicon. For example, one possibility is traditional designs using new types of semiconductor material. Another area of interest is optical processing rather than electrical. Another possibility is the nanotubes already mentioned.

Quoting Blackbird (Reply 12):
BTW: Is the Light-Emitting Nanotube like a microscopic-scale fiber-optic system?

When optical and electric devices are interfaced, one of the challenges is to efficiently convert electrical signals to light -- the other being to convert light back to an electrical singal. There are various ways to do that though doing it at the circuit level inside of a chip is rather challenging. The light-emitting nanotubes may present a very efficient way to do that.

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