We want to produce nickel nano powder, nano porous. In literature very different ways have been offered for production. But what process is the best?
Depending on the size distribution you need, sol-gel might be the best processing method to use. See this paper for more details: http://dx.doi.org/10.1016/S0304-8853(97)00144-3
I think you should try for reduction of nickel nitrate solution using reductant. If you used more solvent (more dilution) you can get more fine particles...
For my part, i suggest you to use hydrothermal method assisted by microwave heating. This is a nice method to obtain very disperse nanoparticles in very short time of synthesis.
If I were You I would check high current density electrochemical methods. I'm not an expert in this field, but electrochemistry provides numerous advantages.
There are three main questions you have to answer first: 1) "nanopowder" - which size and tolerances (PSD)?, 2) "nanoporous" - how "nano" and how "porous"? (and why you need these, as it is difficult to control what happens in nanopores), 3) how many kilos/grams you need per one day and how stable the process should be (i.e. would you need 1 batch for your project or are you going to make many specimens so you have some repeatable production)?
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