what is nano? how to obtain nano material ?
"nano" is a number pre-fix meaning one-billionth. That is, an object with a length of one nano-meter would be .000000001 meter long. You are probably thinking of "nano-technology" which refers to technology for working with and building things that consists of only a few molecules or atoms. I'm not sure what you would mean by "nan-materials". Since a "nan-structure" would, as I said, consist of only a few molecules, there isn't much "material" to it. So far "nano-technology" consists primarily of tiny "bottles" that hold a few molecules of a drug or filters with pores one or two molecules large.
I mean how to make carbon say in nano phase?
Not sure if this will help much, but you can look at this article and go from there: http://en.wikipedia.org/wiki/Carbon_nanotube#Synthesis
thank you but so difficult
As has been said "nano" simply refers to a measurement on the order of 1e-9 metres. Nanoscience is any science dealing with objects at this scale, http://en.wikipedia.org/wiki/Nanotechnology" [Broken] is one that has been specifically engineered on the nanoscale and has at least one dimension between 1 and 100 nanometres.
There is no such thing as a "nano phase" only nano size. Carbon at the nanosize could be tiny amounts of graphite, diamond etc however in the nanotechnology field there is great interest in using http://en.wikipedia.org/wiki/Carbon_nanotube" [Broken] for various uses.
Nano is just a measurement prefix. Alone itself it does not mean anything. However, nanometer, nanofarad etc. make sense.
If you mean nanotechnology it is the science and technology of materials of size ranging between 100 nm - 1 nm. They are generally called mesoscopic systems. Carbon Nanotube is just one of them. others include ZnO nanostructures. Nanopore DNA detector. Nanoclustures of Si, Ag, Au etc.
I'll state a few use of them? Carbon Nanotubes (CNT) can be used as chemical sensors, CNTFETs, energy storage, high mechanical strength devices etc. ZnO nanoparticles make colorless sunscreen.
We have to apply quantum physics in nanoscale systems as in that small dimensions the electrons behave quantum mechanically.
Separate names with a comma.