If we synthesizing powder as nano-particles how to remove impurities?If we washing using water means the nano size particles can move out with water also know,Other than washing how to remove impurities and how to get dry nano-particles.
You will centrifuge your nanoparticles and then will re-dispersed and centrifuge again. Follow same procedure 2, 3 time. Finally washed nanoparticles with ethanol. You will get pure nanoparticles.
It depends on what type and size of impurity that we are dealing with. If the size of the impurity is more, then you can try different filtration techniques or centrifugation at different speeds (actually the RCF matters) and time and separation.
Otherwise we need to use dialysis membranes with required cut-offs.
If you are aware that your impurity is soluble in a different solvent , but not your nanoparticle, then wash with that solvent..
For obtaining dry nano-particle powder, use super-critical drying( freeze drying).
Ya i am also facing the same problem. Can anyone tell the answer for this suggestion. Thank you Helen.
You will centrifuge your nanoparticles and then will re-dispersed and centrifuge again. Follow same procedure 2, 3 time. Finally washed nanoparticles with ethanol. You will get pure nanoparticles.
centrifuge it and filter it with 0.2 microns syringe filter. then make a film and characterize it.
I think there are two methods for this:
1. Centrifuge nanoparticle at high speed ( approximately 6500 rpm for 5-10 minutes) then, wash your nanoparticles with water/ethanol (1:1 v/v) three times and then redisperse nanoparticles in hexane/ water depending upon its nature.
2. Centrifuge nanoparticles then pass it through filters such as 0.22 micron mm cellulose acetate syringe filter and allow it to dry at Vaccum drier/air drier for 12 hours.
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