Journal of Sol-Gel Science and Technology June 2004, Volume 30, Issue 3, pp 135-140

Sol-Gel Synthesis of Transparent Alumina Gel and Pure Gamma Alumina by Urea Hydrolysis of Aluminum Nitrate.

You can find the details about a synthesis method for Al2O3 nano particles by sol-gel method.

http://www.sciencedirect.com/science/article/pii/S0025540805001492

Please follow this link, its a best paper for synthesis of alumina nanoparticles

Hi..Janki, there are a lot of articles concerning on Alumina preparation (from old to the newest one in this internet, you have to specify which alumina do you mean). For examples :  http://www.mdpi.com/1996-1944/5/2/336/pdf  ;  http://wjoe.hebeu.edu.cn/ICCE-proceedings%20Hawaii% 20USA/Seetala, %20N.V. %20 (Grambling%20St.U.,%20LA)%20%20903.pdf ;  http://www.ceramics-silikaty.cz/2011/pdf/2011_04_378.pdf , and  http://www.ijcea.org/papers/172-A663.pdf 

Hope this will be useful.

the sol-gel synthesis consisted

in the preparation of a 0.1 M AlCl3 ethanolic solution.

By adding a 28% NH3 solution (p.a. Fluka) a gel was formed. The gel was let to

maturate for 30 hours at room temperature and then dried at 100o

C for 24 hours.

the sol-gel synthesis consisted

in the preparation of a 0.1 M Al solution. 28% NH3 solution was added in order to form a gel.

Mild shaking at 90o

C for10 hours was utilised. The gel was let to maturate at

room temperature for 24 hours, and then dried at 100o

C for 24 hours.

The resulting gels were calcined in a furnace for 2 hours (heating rate

20o

C/min.), at temperature values of 1000o

C and 1200o

C

thank u all  )

what is the main difference between alpha Al2O3 and gamma Al2O3  nanoparticles?