Comments on: New Hampshire Startup Makes World’s Largest Sheets of Carbon Nanotubes

By: Peter Marks

Peter Marks — Thu, 21 May 2009 01:23:56 +0000

Will someone please send me an email with the stock symbol for Nanocomp Technologies. This is a stock to buy for the long term.

By: Fred Stone

Fred Stone — Tue, 19 May 2009 17:56:25 +0000

What is the stock symbol for Nanocomp?

By: Stuart Halliday

Stuart Halliday — Wed, 18 Mar 2009 17:32:22 +0000

How can they be used as a substitute for copper wiring?

Copper has a very low resistance per metre.

Carbon isn’t anywhere near as low so you’ll need more power to send the signal through a length of carbon fibre.

So an aircrafts power supply would need to be substantially bigger and heavier to compensate.

By: Material Handling Equipment

Material Handling Equipment — Thu, 09 Oct 2008 05:02:42 +0000

To recall, Carbon nanotubes are allotropes of carbon with a nanostructure that can have a length-to-diameter ratio greater than 1,000,000.
Its better enough that the composition must be discuss clearly to know the possibilities of this technology. We must know the pros and cons of this.
I guess understanding between chemistry and physics are very important in this aspect.

By: Paul

Paul — Sun, 13 Jul 2008 04:05:45 +0000

Too bad, carbon nanotubes are toxic, take very good care while handling them.

You have been warned!

By: In the world of carbon nanotubes…: Misterchou is Jason Chou

In the world of carbon nanotubes…: Misterchou is Jason Chou — Tue, 04 Mar 2008 03:41:14 +0000

[...] Nanocomp Technologies just came out with capability to make large sheet of nanotubes. Game [...]

By: Henrik Eiriksson

Henrik Eiriksson — Mon, 03 Mar 2008 09:20:22 +0000

Quote:
“Antoinette says the sheets would be particularly good for shielding electronic components from electromagnetic interference”

Well, how about shielding humans from electromagnetic interference aswell? It’s a real problem and carbon-based EMF shielding is a real solution, like this: http://www.yshield.com
I’m looking forward to this nanotech to become affordable to others than Boeing and Nasa.

By: New Hampshire Startup Makes World’s Largest Sheets of Carbon Nanotubes | SpaceChannel.TV | Blog

Sun, 02 Mar 2008 20:22:14 +0000

[...] Xconomy reports: Ever since scientists first figured out how to make carbon nanotubes—tiny cylinders of carbon with diameters of a few tens of nanometers—they’ve been touted as the material of the future: as strong as steel but far lighter, with the ability to conduct electricity in useful ways. The problem is that because they’re so small, it’s been difficult to make them at scales that would be useful to industry. You can’t really build a lightweight airplane a few microns at a time, after all. [...]

By: guan

guan — Sun, 02 Mar 2008 19:50:38 +0000

I guess understanding the chemistry is important because there seems to be some confustion.

the strength of these sheets comes entirely from weak van der waals and pi stacking forces. not covalent bonds. lots of covalent bonds (to other tubes) in a nanotube backbone completely destroy regularity and essentially change the properties so that you no longer have nanotubes.

That is why the article said that the trick was growing the tubes long. if you have long tubes that overlap, held together with weak forces, the overlapping tubes will maintain a net end to end force holding the sheet together.

if you add JUST the right amount of covalent bonds (like 4 bonds per tube) you will have the strongest lightest material ever made, Guaranteed.

the difficulty lies in controlling the extent of reaction.

I want to know if this company has developed a way to control stereoregularity.

remember kids, a sheet of paper can be rolled up in a few different ways. remember kids, graphene looks different along 2 different axes in a plane. you can roll nanotubes up from the “corner” or from one side or the other. depending on how you roll it up you get different properties.

if these guys have developed a way to make bulk nanotubes, with control of wall (single wall vs multiwall as multi wall are useless more of a structural material and single wall an electronic material), and stereoregulartiy, they will be the richest bastards ever…

this is the same breakthrough that was made when people figured out you didnt need a mass spec to make fullerenes. in other words the price went from 1000 dollars per gram to 100 dollars per gram. researchers will be thrilled.

By: Peter

Peter — Sun, 02 Mar 2008 19:46:02 +0000

I strongly suspect that the tensile strength quoted is actually a typo by the reporter. Either that or he got his facts seriously wrong. It is unfathomable to me how a sheet of carbon nanotubes would be LESS strong than an equivalent sheet of aluminum. And any company that created such a wimpy sheet of nanotubes sure wouldn’t be boasting about it.

By: san

san — Sun, 02 Mar 2008 18:10:37 +0000

Unwrap a nanotube, and you have a sheet of graphene. If you could create a sandwich composite of graphene layers, of MxN sq.meters in area, then it would likely have more strength than nanotube mats, since all the bonds would be in the same plane. Graphene is more of a wonder material than nanotubes are, and would give higher-strength sheets.

By: Large Sheets of Carbon Nanotubes Produced

Large Sheets of Carbon Nanotubes Produced — Sun, 02 Mar 2008 17:49:59 +0000

[...] The trick, says Antoinette, is being able to make the tubes a millimeter long. Many carbon nanotubes, in addition to having vanishingly tiny diameters, are at best a few tens of microns long (a micron is one-thousandth of a millimeter). So most production processes create what is essentially a powder of nanotubes, Antoinette says. Via Xconomy [...]

By: Mark

Mark — Sun, 02 Mar 2008 17:36:08 +0000

David:
Yeah, but although they say the two sheets are the same strength the CNT sheet might be much lighter. Plus the idea is that the same technique will be applied to longer and longer CNTs resulting in much stronger sheets. Of course the big deal would be a MxN meter sheet where all the NTs are N meters long in one dimension and M in the other (ie the tubes span the sheet end to end with no breaks). What would really be cool would be tubes that intersect at fullerenes so that the two dimensions are bonded.
Mark

By: David

David — Sun, 02 Mar 2008 17:13:23 +0000

So, it’s just barely as strong as Aluminum? Excuse me while I yawn.

By: More carbon nanotube development from Nanocomp - The Space Elevator Blog

More carbon nanotube development from Nanocomp - The Space Elevator Blog — Tue, 26 Feb 2008 06:12:30 +0000

[...] strength of these sheets, from this press release, are: The tensile strength of the mat ranges from 200 to 500 megapascals—a measure of how tough [...]

By: robert carrier

robert carrier — Mon, 25 Feb 2008 16:00:38 +0000

You say that you are producing these “sheets” now at one per day what grade . are these SWCNT compared to what is being done and produced now in SWCNT and are they availble to industry.