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.
Dear all, please check these documents. My Regards
http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0012-73532016000100028
https://doi.org/10.1063/5.0001593
https://doi.org/10.1016/j.proche.2016.03.095
https://www.researchgate.net/publication/341735857_Synthesis_of_Zinc_Oxide_Nanoparticle_by_Sol-Gel_Method_and_Study_its_Characterization
https://www.researchgate.net/publication/226317213_Preparation_of_ZnO_Nanoparticles_by_a_Surfactant-Assisted_Complex_Sol-Gel_Method_Using_Zinc_Nitrate
https://doi.org/10.4028/www.scientific.net/DDF.273-276.626
https://doi.org/10.1080/15533174.2013.801856
@yuri mirgorod sir
For how much time should I put it in the centrifuge? I previously did try for 5 minutes.
A chilled centrifuge must be used with a speed of not less than 10,000 rpm and for a period of at least half an hour. The filtrate is poured in and the precipitate is allowed to dry at room temperature.
Dear Jitesh Pandya, is it really important to use the protocol you are following? Sol-Gel technique is much more simple, with less chemicals and high boiling solvents, and more essentially only 3000 rpm for 30min is enough to precipitate ZnO nanoparticles with excellent properties. If interested I can upload interesting documents. My Regards
Jitesh Pandya
See the instructions for the centrifuge. Centrifuge for 5 minutes. Stop, look at the degree of separation of the sediment, if not separated, continue as necessary until complete separation.
Abdelkader BOUAZIZ sir
yes if you could share the documents it would be great.
Thanks
Dear all, please check these documents. My Regards
http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0012-73532016000100028
https://doi.org/10.1063/5.0001593
https://doi.org/10.1016/j.proche.2016.03.095
https://www.researchgate.net/publication/341735857_Synthesis_of_Zinc_Oxide_Nanoparticle_by_Sol-Gel_Method_and_Study_its_Characterization
https://www.researchgate.net/publication/226317213_Preparation_of_ZnO_Nanoparticles_by_a_Surfactant-Assisted_Complex_Sol-Gel_Method_Using_Zinc_Nitrate
https://doi.org/10.4028/www.scientific.net/DDF.273-276.626
https://doi.org/10.1080/15533174.2013.801856
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