I am synthesizing ferrite nanoparticles by co-precipitation. I have seen in many papres that these naoparticles could be well dispersed if a surfactant such as oleic acid or oleylamine is added during synthesis. I am not sure at what stage of synthesis the surfactant sholud be added. Once I added the surafctant before washing of precipitates and ultrasonicated so that surfactant is well coated over all the precipitates. but it didn't work and I ended up with a hard agglomerate.
Try nanochmical synthesis. You make NIPAM dendrimer and complex with the salts and reduce by controlled addition of sodium borohydride solution
Surfactant needed to be in solution before addition of amine so that MNP gets coated before formation of large aggregates. However, it is very difficult to synthesized monodispersed MNP using co-precipitation method. Try solvothermal process.
Dear Tarun Garg,
Add oleyl amine to the 2:1 ratio of FeCl3: FeSO4 solution, heat the mixture to 70-80 oC and then precipitate using ammonium hydroxide. you will get aqueous dispersion of iron oxide nanoparticles.
using mixed capping agent like PEG+cyclohexene it will help to prevent agglomeration
I've never managed to synthetize decent superparamagnetic MNPs by co-precipitation. Conversly by solvothermal method is really simple: Fe(III) acethylacetonate with oleylamine at reflux under inert athmosphere is the simplest way to go according to my investigations. It works either by heating-up the solution gradually or by hot-injecting the Fe(III)-OA complex.
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