magnesium oxide nano and zinc oxide nano in distilled water and then i used sonication to disperse them in the solvent
Hi,
the sonication can disperse your nanoparticles, but you need to stabilize them to prevent re-aggregation. Either you use a solvent that builds up a surface charge generating a sufficiently repulsive electrostatic force (zeta potential at least ±10 mV), or you can use loosely adsorbed polymer chains:
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Dear Lepico, Petr Lepcio You can disperse your material by dissolving it in any organic solvent like ethanol and water, followed by the ultrasonication step. (Additionally, you can give high temp for homogenous dispersion).
Dear Nitesh Choudhary,
yes, that's true, provided you use proper sonicating conditions that generate strong cavitation. But that's only half of the success. Many nanodispersions will re-aggregate thereafter due to attractive van der Waals forces. The question was how to maintain a dispersion - as I wrote above, the two most common approaches would rely on electrostatic and steric repulsion. The experimental conditions, such as temperature or the solvent, might be different, but the general requirement would be the zeta potential of at least ±10 mV or loosely adsorbed polymer chains forming a repulsive brush. It's a whole different question of how to make a solid nanocomposite out of it.
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