Thanks a lot for your answers.

I have one more question: after synthesizing ZnO nanoparticles , I am not able to separate from the original solution (dispersion actually). The recipe is as follows:

1.5 mmol Zinc acetate dihydrate in 15 ml DMSO stirred at 30 degree celsius. then 2.8 mmol tetraethylammonium hydroxide pentahydrate (TMAH.5H20) in 5 ml ethanol is dropped in the solution. The solution is kept stirring 24h prior to the precipitation process. The ZnO nanoparticles were precipitated by ethyl acetate, and washed with ethyl acetate and ethanol for one more time. Finally, the obtained ZnO nanoparticles were dispersed in 8mL ethanol and filtered with 0.45 micron filter before use.

I have some major questions in this process:

1. How can I separate the ZnO NPs for washing? I tried centrifugation at 6000 rpm but i could not get rid of the solvents (DMSO and ethanol).

2. What is the volume of ethyl acetate to be dropped for the precipitates?

Please it would be great if anyone could help me resolve this issue.

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