I need an amount of about one kilo of nano silica so could I used concentrated solution or a fast method to get this amount
I worked a bit on nanoparticles. From my experience I can say that you need dilute solution to get nano particles and the rate of formation should be slow. Concentrated solution or a fast method may not be suitable to produce nanoparticles, there will be agglomeration.
You can definitely have a fast method, however it uses somewhat diluted solutions. I'm referring here to the Stober synthesis of spherical silica nanoparticles, which can be as small as ~20 nm.Typical reaction times are 15 -120 min.
Some good papers in which you can find synthesis conditions for various nanoparticles sizes are: W. Stöber, A. Fink and E. Bohn, Journal of Colloid and Interface Science, 1968, 26, 62-69.
K. S. Rao, K. El-Hami, T. Kodaki, K. Matsushige and K. Makino, Journal of Colloid and Interface Science, 2005, 289, 125-131.
G. H. Bogush, M. A. Tracy and C. F. Zukoski, Journal of Non-Crystalline Solids, 1988, 104, 95-106.
You could also get silica nanoparticles from commercial sources. It is used mostly in the pharmaceutical industry (called "fumed silica") and it is made through pyrolysis. One drawback of fumed silica is that it consists of agglomerated particles.
i am not sure about pure nano siilica but, different derivatives of sillica like functional alkoxysilanes can be converted to nanostructured matrices by sol gel method i.e, succesive condensation and hydrolysis.
there are several concentrated nano silica products on the market, e.g. Köstrosol, Ludox. Therefore I assume that there are some patents if you do not want to simply purchase them. Other option would be supplier of silica for CMP slurries.
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