What are the methods during synthesis procedure to prevent the agglomeration?
Does compositing the nanoparticles decreases the tendency towards agglomeration?
Hi, the agglomeration depends on what particles you're trying to synthesize. I'm working with iron oxide nanoparticles, and it agglomerates easily whatever the composition is. However, the nanoparticles can be deagglomerated by using several surfactants or modifying it's surface.
Two methods I have used :
1. Microemulsion. Pros : controlled size of particles, non-agglomerated particles (in the synthesis there is a use of surfactant). Cons : longer times to setup, high cost for the reagents, non-environmental friendly.
2. Coprecipitation. Pros : easy and fast. Cons : particles agglomerates rapidly, but can be modified using surfactants.
Keep the material in colloidal or atomized suspension. Do not dry or bring particles into contact with one another or surfaces. See:
Nov 11th, 2008. Dispersion and nanotechnology http://tinyurl.com/hpywsge
November 3rd, 2015 Adhesion and cohesion http://tinyurl.com/zwb2wlh
I agree with Dear Mr. Rawle. If you dry your particles, the agglomeration is inescapable. So you need to keep them in the liquid as Mr Rawle suggested.
For the de-agglomeration of particles in liquid system, you need the increase the surface charge of the particles as suggested above.
Best Regards.
Thanks for all of the useful advises,
I have synthesized CdO-ZnO composite and according the FESEM results there is considerably lower agglomeration for CdO-ZnO compared to CdO or ZnO alone (with the same synthesis method and conditions)
Can I explain the uniform morphology as a result of composition? how can I explain the matter?
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