I am trying to make zinc oxide nanosuspension, but the system becomes unstable. I searched for the shortest method to do it. But we are not able to make it. Please provide me with a solution to my problem. Thank you
More details are needed to give you an appropriate answer. Could you provide the synthesis protocol you followed, as well as the medium you are trying to disperse the nanoparticles in (solvent, salts, pH if water, ...), and if you have it the nature of the surface ligands?
From your profile, i guess you are trying to disperse the ZnO NPs in an aqueous media. Have you tried functionnalizing the surface with amino acids (arginine, aspartic acid, cystein, ...) or PEG-SH?
A simple colloid-based method for producing ZnO nanosuspension was employed using zinc acetate dihydrate and potassium hydroxide in methanol. You can find further details in the paper that I have included for your perusal. I trust this provides the assistance you need.
Indeed it is easier to assess what you are trying to obtain.
According to Figure 4 in the article, their NPs are not stable. They precipitate in 0.5 hours at worst, and 2 days at best. Redispersing their NPs in a mixture of polar/apolar solvant is rather unusual too. Normally those mixtures are used to cause them to precipitate. Finally the low amount of organics registered by TGA hints at the lack of surface ligands, probably causing the destabilization of aggregation of their NPs.
I think there are 2 choices here :
-Try to functionnalize your ZnO NPs with surface ligands compatible with the solvant you want to disperse your NPs in. Adding back the potassium acetate removed during the washings might help for methanol.
-Try another procedure entirely. Here are 2 papers with more standard procedures : Article Synthesis and Growth of ZnO Nanoparticles
Article Size-dependent redox potentials of quantized zinc oxide meas...
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