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Specialty Chemistry Forums => Materials and Nanochemistry forum => Topic started by: wiseowl on February 01, 2021, 06:25:06 PM

Title: solidify colloidal nanoparticles
Post by: wiseowl on February 01, 2021, 06:25:06 PM

Hello everyone, I have been testing the synthesis of gold colloids through the Turkevich method, just by experimentation. So I have two questions:
1- Is it possible to crystallize or solidify the colloidal gold nanoparticles? I don't know if it is possible to form crystals or solids of the saline type in a cluster.
2- Can colloidal gold return to its metallic form with heat, as it is done with the precipitated chloride of aqua regia?

Title: Re: solidify colloidal nanoparticles
Post by: Corribus on February 02, 2021, 01:04:54 PM

These questions don't make a whole lot of sense. What do you mean by crystallizing gold nanoparticles? The gold is already in a solid state. The particles can aggregate, continue to grow, ripen, or dissolve. Colloidal gold is already in metallic form. Do you mean, return to ionic state? They can, with a suitably strong oxidant or pro-oxidant conditions. Gold particles are pretty stable, usually, though.