[LargineJohnson]

i have researched this subject in great detail but I keep getting unstuck here. can anyone help??

[Arkcon]

OK, I'll bite.  What is the application in question, and what are the advantages?  Can you make a guess, what the disadvantages are?  For example, whatever the advantages are, can they be too good, and can that be a disadvantage?  Can greater efficiency, of your particular application, be in some way deleterious, at another step?

[Mitch]

They're time consuming to make in an appreciable yield would be a negative.

[LargineJohnson]

Hello All Member,

I am new member in this forum.
How to determine the purity of the Nanotube ?
Please share your suggestion here....

[LargineJohnson]

Hello All Member,

How is the Purification method for nanotubes?

Please share your opinion here..

[Arkcon]

Greetings, and welcome to the forums.  I can see you're new, and I'd like to let you know we're a diverse group of professionals and students who like to ask and answer questions.  You've asked the same question three times, and I'm sorry you haven't received an answer yet.  But your question, is so general, there is no answer we can really give, unless we write a textbook, one letter at a time, and no one wants to do that.  So please, try to find and read some online resources for your topic, or check a university library for some general text on the subject, then come back with some more specific questions.

[Rabn]

Please provide more background information on the production method and on state of the nanotubes whose purity is in question, i.e. in a mixture with graphite and fullerenes etc...

[artwork]

I presumed there're other form of carbon structure. As far as i know, DSC can be use to determined the purity. Fullerene, CNT and perhaps remnant catalyst used if any will burned off or reacted with oxygen at different temperature. The mass loss could be used to determined the molar percentage of CNT.

I am not sure not accurate RAMAN is in determining the purity. Or perhaps low angle XRD could also be try !

[artwork]

 

I agreed with the saying it's very much depend on the application of interest.

Overall, the disadvantages of CNT is it's a relatively new technology !

Sumio Iijima first reported it at 1991 with the EM back at that time, could have exist well before that date as the technology to "see" it is not there. Seeing is believing overall !

In term of fabrication, CNT has somehow at its mature state-CVD, laser, solar,arc just to name a few, the application like putting a string of CNT onto AFM tip is like "woh" impressive work !

The tools for handling and seeing of this tiny object is an obstacle for CNT to become more versatile.

Don't be surprised that the standard from Geneva for CNT out only late 2008 !

Disadvantage today, not tomorrow !

[zolarpwr]

They self-aggregate strongly when attempts to disperse them are made. This includes liquid phases and in blends with solid materials. Not only does this hinder the prognosis of new tough composite materials being made, but it also makes their more general study difficult.

[FreeTheBee]

Controlling the thickness and thereby their electronic properties is difficult or even impossible, which is a problem in applications like transistors and such. Unless, some major steps were made in the last year or so, that I'm not aware of.

On a personal note, I find the hype surrounding these tubes and their counterpart graphene quite a disadvantage. But perhaps that is a bit sour :-)