I want to make a ZnO solution from ZnO nanoparticles, but the initial dispersion of ZnO nanoparticles in methanol is hazy and white. we have tried to add a bit of acetic acid, but the results were not very much encouraging.
What do you mean by "solution"? In a solution, the components are dissolved, i.e. in your example you would have to split the ZnO into Zn2+ and O2-. That will not happen since ZnO is quite stable (covalent bond) and will not dissolve like ionic materials.
Or do you mean to make a stable dispersion? You say that you have an initial dispersion, how is this dispersion stabilized? In which kind of medium do you want to prepare your dispersion?
0.01 M of Zinc acetate dihydrate was dissolved in the 75 ml of boiling ethanol (75 ̊C) in a round bottom flask fitted with a condenser at atmospheric pressure. The
solution is refluxed at 75 ̊C for about 30 minutes and subsequently allowed to cool at room temperature to give a transparent and stable Zn based precursor. In another beaker, 0.014 M of lithium hydroxide monohydrate was dissolved in 50 ml of ethanol ultrasonically to accelerate the reaction at room temperature. A clear solution is obtained after sonication for about 25-30 min. The hydroxide containing solution was added drop wise to the acetate containing solution at room temperature under vigorous magnetic stirring, and finally a transparent (clear) ZnO solution is obtained after hydrolyzing the precursor.
Why do you want to get clear solution of ZnO? So long you disperse powder, even if it is very fine, and scatter the light looking as fog. In order to be a clear solution it will it must be chemically dissolved to ionic level as hinted before. I think if you want to form a thin film from nano powder you need to heat it up to to improve the adhesion between the particles and the particles and substrate.
Best wishes
try dmf solution, take a certain minimum quantity of ZnO nanoparticles in a beaker and add 10-20-ml of DMF and keep for stirring for at least 4 hours preferably for overnight.
hope this helps
Sudeep Mudhulu what is an appropriate speed of magnetic and heat stirrer for a solution ZnO in DMF?
Don't heat but just stirr the solution. Make sure that once u fix the rpm u don't change it.
- Badges
- Science method