Dear RG's kindly suggest me the method of drying or collecting the Ni and NiO nanoparticles for XRD and TEM.My method of preparation is chemical reduction in aqueous medium my nanoparticles are capped also
Depending on what solvent you are cleaning them with centrifuging. I have found the double broil method works best on my particles. I have a low boiling solvent so I boil water on a hot plate. Then you can just put test tubes inside the water bath for a few minutes.
Doesn't have to boil either. Just need another liquid with a higher boiling point then what you are using.
Also, not sure you want to dry for TEM. Best way for that as long as your solvent can evaporate is to put a drop on a glass slide and then use tweezers to push a grid into the drop and let it evaporate under it.
Check out this video for nanoparticles in solution and getting them onto the TEM grids. Method 3 worked wonders for me.
https://www.youtube.com/watch?v=W1sAYaHLRRE
Thanks dear Tim Ritter,but heating convert black solution (Ni-NP'S) into colourless Ni(OH)2 or NiO solution,how to avoid this phenomenon,my solvent is alkaline (NaOH)aqeous medium with an organic acid(surfactant),how much quantities are required to get few mg of nanoparticles for XRD and TEM. If concentration of reacting system increase,precipitate is formed .
You need a good powder for the XRD. I have gotten fairly decent results from 10 mg of my powder but all depends on what you precipitate out. TEM you only need a good drop or two.
My double boiler method only works if your reaction temperature is higher and it won't effect your nano particles. If you are running your reaction at low temperatures your other option is to vacuum dry your precipitates. Although I have had bad luck having that method work for me but depends on your solvent. Some just vaporize off better than others.
You can try to centrifuge your solutions to get your nano particles out of suspension. Hopefully your particles are not air sensitive.
To dry the solution for XRD you can use vacuum treatment. It's a standard procedure for XRD and for SEM (attention to TEM mash).
Thank you so much Tim Ritter and Martin Ochmann for your suggestions ,I hope it will work for me too.
Regard
Muhammad imran khattak
No problem . Sometimes the vacuum thing is iffy. The TEM method works great though. might take a little longer if your solvent doesn't evaporate fast like mine but still good.
Thanks dear Tim Ritter and remveer Singh for your suggestions ,
Regard
Muhammad imran khattak
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