After the reaction, i centrifuge the precipitate, dried them, and manually crush them with mortar and pestle. But the size distribution is too high, depends on how long i crush them. Anyone has any other method to retrieve homogen size nanoparticles without manually crushing them?
Don't dry them and never get them in powder form: 'nanopowder' is an oxymoron as there are no free, independently transportable particles of nano-dimensions (< 100 nm) in a powder. Keep the particles separate in colloidal or atomized form. See for example:
November 3rd, 2015 Adhesion and cohesion http://tinyurl.com/zwb2wlh
November 11th, 2008. Dispersion and nanotechnology http://tinyurl.com/hpywsge
The aggloeration is a problem for nano particles. Its not so easy to break the agglomeration with grinding. So you can increase your particle size, or you should find a powerful stabilizator.
I will add those ZnO particles to surfactants & stabilizer and disperse them by magnetic stirrer and sonication method (sonicator bath). Hopefully get stable nanofluids.
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