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05-11-2009, 05:15 AM
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8 posts, read 14,181 times
Reputation: 10
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Hello All Member,
How is the Purification method for nanotubes?
Please share your opinion here...
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05-11-2009, 08:18 PM
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Location: Westwood, MA
4,768 posts, read 6,283,882 times
Reputation: 5708
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Here is one possible method*:
Disperse nanotubes in 50% xylene, 25% toluene, 25% hydrogen peroxide. Tubes will be difficult to disperse in bulk, so be sure to add each tube individually using type #000 teflon coated stainless steel tweezers. Make sure the molybdenum content of the tweezers is below 0.3% or else you will contaminate the nanotubes before purification.
Once the nanotubes are dispersed, heat the mixture to 135C and sonicate for 12 hours. This should destroy any weak nanotubes and the destroyed nanotubes should be quickly oxidized by the peroxide. After sonication, transfer the nanotube mixture to a density gradient solution comprised of tetrachlorethylene and butane. Centrifuge this for three hours at 12000+/-100 g. You should see three dark bands. Withdraw the middle band, being careful not mix this with the other bands, and place on a platinum substrate (CNTpure, available from Darlington Electronics, Inc.). Dry using a critical point dryer. Hydrogen is preferred for this operation, but CO2 can be used as long as the power range is below 12 ohms. Once dry, place the tubes in an oxygen plasma at 100mTorr O2 partial pressure for 7 minutes. This should finish the purification and once done you will have pure nanotubes.
*This procedure is very dangerous and should not be attempted by anyone ever.
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05-13-2009, 06:44 AM
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8 posts, read 14,181 times
Reputation: 10
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Hi,
Jayrandom
Thanks for your early response here....
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05-13-2009, 11:02 AM
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Location: Westwood, MA
4,768 posts, read 6,283,882 times
Reputation: 5708
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Just a question...why are you asking so many questions about nanotubes? If this is for a report, you should know there are much more reliable means for gathering information than asking on a bulletin board. It will require more effort on your part, but the extra effort will be well spent.
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05-14-2009, 10:52 AM
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3,147 posts, read 8,322,374 times
Reputation: 897
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Quote:
Originally Posted by jayrandom
Here is one possible method*:
Disperse nanotubes in 50% xylene, 25% toluene, 25% hydrogen peroxide. Tubes will be difficult to disperse in bulk, so be sure to add each tube individually using type #000 teflon coated stainless steel tweezers. Make sure the molybdenum content of the tweezers is below 0.3% or else you will contaminate the nanotubes before purification.
Once the nanotubes are dispersed, heat the mixture to 135C and sonicate for 12 hours. This should destroy any weak nanotubes and the destroyed nanotubes should be quickly oxidized by the peroxide. After sonication, transfer the nanotube mixture to a density gradient solution comprised of tetrachlorethylene and butane. Centrifuge this for three hours at 12000+/-100 g. You should see three dark bands. Withdraw the middle band, being careful not mix this with the other bands, and place on a platinum substrate (CNTpure, available from Darlington Electronics, Inc.). Dry using a critical point dryer. Hydrogen is preferred for this operation, but CO2 can be used as long as the power range is below 12 ohms. Once dry, place the tubes in an oxygen plasma at 100mTorr O2 partial pressure for 7 minutes. This should finish the purification and once done you will have pure nanotubes.
*This procedure is very dangerous and should not be attempted by anyone ever.
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LOL... Almost believable... need to change some of the units mentioned to make sense with the process and you'll be all set. HAHA |
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05-17-2009, 04:39 AM
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Location: USA
3,966 posts, read 10,303,382 times
Reputation: 2224
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Ann, you could always buy a nanotechnology books or text books from amazon. There are many publications out there and with the proper science background you would be able to decipher them correctly.  |
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05-20-2009, 04:45 AM
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8 posts, read 14,181 times
Reputation: 10
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Thanks To all share your opinion here ...
I prefer ..
When the material is made (as-produce) the nanotubes comes straight out of the reactor with the approximate concentration of 95% MWNT ( 90% in the case of SWNT) nanotube vs. non-nanotube material. These nanotubes are then processed and purified. This step yields an increase in purity of the tubes which are sold as "Purified Open Material". This step uses a Heat and Acid Wash process, which removes the non-nanotubic material. (Non-Nanotubic material is usually comprised of amorphous and graphitic carbon, and metal catalyst, Nickel-Yttrium, Iron or other metals).
More...................
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Nanotubes |
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