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Researchers produce strong, transparent carbon nanotube sheets (big advance)
University of Texas at Dallas , physorg.com ^
| 18 Aug 05
| staff
Posted on 08/18/2005 5:12:15 PM PDT by Arkie2
click here to read article
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To: Arkie2
If we could just use nano technology somehow to reduce dependence on oil - that could solve a lot of problems!
41
posted on
08/19/2005 9:37:57 AM PDT
by
marvlus
To: JamesP81
While nanotube armor may stop bullets (or may not, as I mentioned above), the armor still will not protect from the deadliest effect of a firearm: hydrostatic shock. If you're wearing armor and it stops a 30-06 moving at 3000 feet per second, you will still have to have medical attention within a short period, or you'll still die.What a load of nonsense. Conservation of energy and momentum guarantees that the same energy and momentum is applied to the shooter as the shootee. If your statement were true, then the recoil would cause as many problens as the bullet. I only know of one case of a person getting killed by recoil and that's when the recoil toppled a heavy automatic weapon on her. What causes in injury in a gun shoot wound is the tearing an puncturing of things that were not made to be torn and punctured.
When you think about how redundant a human body is
Another load of nonsense. Yes, you have two legs - try walking with just one of them. You have two eyes - try doing a task that requires depth perception with just one of them. You have two arms. Try picking up a large package with just one. Sheesh.
42
posted on
08/19/2005 9:51:55 AM PDT
by
from occupied ga
(Your government is your most dangerous enemy, and Bush is no conservative)
To: marvlus
The article I posted for this thread alluded to improvements in batteries. The article below expands on that and I believe the following article was written before this manufacturing breakthrough. Why does that matter to reducing dependence on oil? Better batteries for electric cars, better batteries for storage at wind farms and solar arrays. Batteries are important in the last two applications because they could serve to even out the production of electricity.
Introduction Ultracapacitors or double layer capacitors (DLCs) are energy storage devices whose operation is based on the double layer effect. By utilizing highly porous carbon material with a surface area up to 2000m2/g as electrodes (as in Fig. 3) commercial DLCs can achieve a energy density (6Wh/kg) much greater than the energy density of a conventional capacitor. However, this figure is much lower than the energy density reached by Lithium-Ion batteries (120Wh/kg).
Our analysis shows that the utilization of a matrix of vertically aligned CNTs as electrode structure, can lead to an ultracapacitor characterized by a power density greater than 100kW/kg (three orders of magnitude higher than batteries), a lifetime longer than 300,000 cycles, and an energy density higher than 60Wh/kg.
Double Layer Principle:
The significant energy density improvement of DLCs over other types of capacitors arises from the higher specific capacitance achieved with DLCs that can be up to 180 F/g. This result can be explained by the double layer principle discovered by Helmholtz in 1853. According to the Helmholtz model, when two electrodes, between which a potential is established, are immersed in an ionic solution, ions from the electrolyte migrate to the interface between the oppositely charged electrode and the solution.
Nanotube Enhanced Ultracapacitor:
A matrix of vertically aligned carbon nanotube (CNT) has been investigated as a DLC electrode. Our analysis shows that this configuration can provide a combination of high power density (more than four orders of magnitude greater than fuel cells) and energy density (comparable to Li-Ion batteries). The significant enhancement in the achievable DLC power density derives from the high conductivity obtainable with CNTs, which in the limit of a few microns in length present ballistic conduction. The energy density improvement of a nanotube enhanced electrode is due to the higher effective surface area obtainable with a structure based on vertically aligned nanotubes over activated carbon.
Recently, we have been able to grow straight single wall nanotubes (SWNT) with diameters varying from 0.7 to 2nm and a length of several tens of microns. We grew SWNTs via thermal chemical vapor deposition (CVD) on a silicon substrate coated with a catalyst consisting of nanocolloids of aluminum oxide (AlO2) coated with iron nitrogen oxide (Fe(NO3)3). The average diameter of the catalyst seeds was 3nm. The substrate coated with catalyst was processed at 900°C at atmospheric pressure by CVD in an environment saturated with hydrogen (H2) and argon (Ar). As stockfeed gas we used methane (CH4). Single wall nanotubes grew from the Fe(NO3)3 seeds via decomposition of methane at the catalyst interface.
http://lees.mit.edu/lees/projects/cnt_ultracap_project.htm
43
posted on
08/19/2005 10:16:13 AM PDT
by
Arkie2
(No, I never voted for Bill Clinton. I don't plan on voting Republican again!)
To: RinaseaofDs
Maybe we will go back to armored knights. If carbon tube armor is light enough you can start to engineer in other features like shock absorption even using other materials and engineering.
44
posted on
08/19/2005 10:43:34 AM PDT
by
nomorelurker
(wetraginhell)
To: from occupied ga
What a load of nonsense.
If it were a load of nonsense, then people who are shot while wearing kevlar vests wouldn't have things like broken ribs from the experience. Unless nanotube armor could stop a projectile and completely dissipate the energy away from the wearer, it would be no better than kevlar. Consider: when Kevlar stops a handgun round, it pretty much debilitates the wearer. He's not in the fight anymore. And we're talking about handgun rounds that probly don't exceed 1200 feet per second. Scale that up to 3000 feet per second for your average civilian hunting round (which kevlar is incapable of stopping anyway) and the wearer is still likely to die from the shot even if the armor stops the round. Might want to think about those things before you spout off.
Again, there is nothing in the article that suggests that carbon nanotubes have good ballistic properties. I don't see why we automatically assume that they would. It has high tensile strength, but that doesn't necessarily transfer to stopping a projectile. Hardened steel also has high tensile strength. It's also very brittle and prone to break.
The big advantage I see to this technology is the realistic possibility of aritificial limbs as good as the original.
45
posted on
08/19/2005 11:33:11 AM PDT
by
JamesP81
To: q_an_a
just think what might be happening in Texas if Newt and a bunch of penny pinching GOP had not shut down the Super Collider 8 years ago. The Supercollider was cancelled in October, 1993. It happened on the Dems' watch.
I know this because I was hired at Penn in August, 1993 to do detector design for it.
For the record, I don't know that it would have been of much direct utility for this sort of technology (not that that was its purpose).
To: Lauretij2
Ping on #46.
To: Arkie2
Let's get started on that space elevator.
48
posted on
08/19/2005 12:06:07 PM PDT
by
Sloth
(History's greatest monsters: Hitler, Stalin, Mao & Durbin)
To: doc30
Asbestos is particularly harmful (some species) because they have fishhook-type barbs that attach to the bronchial walls at the bottom of lungs and irritate the lining with the resultant scarring and death of the wall and cilia
Ordinary dust causes a condition characterized as silicosis.
49
posted on
08/19/2005 12:13:44 PM PDT
by
Old Professer
(As darkness is the absence of light, evil is the absence of good; innocence is blind.)
To: Physicist
I'm shock! Someone who knows what they are talking about. I personally like to just shoot my mouth off about issues I know nothing about - "if I don't understand, I blame Newt or Bush" /sarcasm
To: Physicist
The Supercollider was cancelled in October, 1993. It happened on the Dems' watch. Was it the Clintons or members of Congress that killed it?
51
posted on
08/19/2005 12:26:43 PM PDT
by
Moonman62
(Federal creed: If it moves tax it. If it keeps moving regulate it. If it stops moving subsidize it)
To: q_an_a; All
I think it was shut down in 93..
52
posted on
08/19/2005 12:29:23 PM PDT
by
KevinDavis
(the space/future belongs to the eagles --> http://www.cafepress.com/kevinspace1)
To: Old Professer
Thanks for the specifics on that. Do you think there will be health and safety issues associated with carbon nanotubes? This material is so promising, I'd hate to see lawsuit considerations kill it in its infancy.
53
posted on
08/19/2005 12:30:48 PM PDT
by
doc30
(Democrats are to morals what and Etch-A-Sketch is to Art.)
To: RightWhale; Brett66; xrp; gdc314; anymouse; RadioAstronomer; NonZeroSum; jimkress; discostu; ...
54
posted on
08/19/2005 12:33:57 PM PDT
by
KevinDavis
(the space/future belongs to the eagles --> http://www.cafepress.com/kevinspace1)
To: xcamel; All
I think it should be Carbon/Space Age..
55
posted on
08/19/2005 12:35:29 PM PDT
by
KevinDavis
(the space/future belongs to the eagles --> http://www.cafepress.com/kevinspace1)
To: Moonman62; All
Both.. I think it had to do with it being in Texas more than anything..
56
posted on
08/19/2005 12:36:08 PM PDT
by
KevinDavis
(the space/future belongs to the eagles --> http://www.cafepress.com/kevinspace1)
To: doc30
Nothing in the literature points to the use of fibers woven tightly from such structures having a potential for cusing harm to human health; cost of manufacture and practical uses for such esoteria have often been the root causes of their non-penetration into the consumer goods market.
57
posted on
08/19/2005 12:37:06 PM PDT
by
Old Professer
(As darkness is the absence of light, evil is the absence of good; innocence is blind.)
To: Arkie2
This is fascinating stuff.
58
posted on
08/19/2005 12:37:18 PM PDT
by
mudblood
To: q_an_a
I thought it was democrat senators from states that lost out to Texas that had it killed (e.g. Mass.) If they couldn't get the funds for such a big project, no one would. Too much opportunity for missappropriation to let that one go by.
59
posted on
08/19/2005 12:38:48 PM PDT
by
doc30
(Democrats are to morals what and Etch-A-Sketch is to Art.)
To: Moonman62
Congress killed the SSC. Clinton supported it, at least when the cameras where on him.
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