I want to prepare different concentration of silver NPs in order to do that I need the powder form of prepared colloidal (citrate capped) AgNPs. Apart from centrifugation and lyophilization is there any other way to do that??
Place your sample for few hours when your nanoparticles are precipitated then decant the solution. Washed the nanoparticles with organic solvent like ethanol. You will get monodisperse nanoparticles
Hello,
I often use a "funny way" to dry nanoparticles dispersions in water by dialyzing the aqueous dispersion against ethanol. Doing this, it is possible to go to almost dry powders for which you will have to remove the trace of ethanol by placing the sample in an oven. This works with aqueous dispersion, and allows to remove a maximum of salts in the dispersion.
I hope this anwer will help.
All the best,
Jérôme Fresnais
Jerome Fresnais thanks a lot for your help, we can try that with small volume of NPs, I have synthesized 500ml and 1 Lit of NPs any possible suggestions for this scale (we dont have high speed centrifuge so every time concentrating it by making the final volume to ¬2 ml is quite labor intensive and loss of NPs is always there)??
Using large then small dialyzing bags should let you to good concentration with low loss of nanoparticles. But you have to know that you may have some ethanol in your final dispersion, which could change drastically the solvent properties and nanoparticle stability.
Thanks Jerome Fresnais, I would keep that in mind I think scaling down the volume (centrifugation) would be a good idea to start with in that case we wont affect the particle stability much.
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