I am preparing nanoparticles by green method.i need to prepare small size nanoparticles .is it possible to prepare small-sized nanoparticles by ultrasonication or any other method is available for preparing nano with less size (10-20nm),....plz answer my question
You cannot produce particles this small by a top-down process (e.g. sonication). You need a bottom up process. Depending on your precursors, then the concentrations (and temperature) of the reducing agent and metal salt can be used to control the final particle size with lower concentrations of the metal salt tending to favor smaller sizes (as the collision frequency that causes aggregation, is reduced). The materials must be kept in colloidal suspension to preserve the nano size.
You can try to use microwave activated hydrothermal synthesis or mechanochemical synthesis. Please, find articles attached.
Article Magnetization enhancement in magnetite nanoparticles capped ...
Article XRD, Raman and magnetic studies of Bi 1− x La x FeO 3 solid ...
You cannot produce particles this small by a top-down process (e.g. sonication). You need a bottom up process. Depending on your precursors, then the concentrations (and temperature) of the reducing agent and metal salt can be used to control the final particle size with lower concentrations of the metal salt tending to favor smaller sizes (as the collision frequency that causes aggregation, is reduced). The materials must be kept in colloidal suspension to preserve the nano size.
As Alan said, control bottom up process and keep particles in solvent.
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