You have not mentioned the name of metals you are interested to reduce. You can reduce Cu, Ag, Au, Ni, Co, Pd, Pt, Ir, Rh, Ru from solution using formaldehyde. Particle size will be to your expectation.

THANKS

We are interested in Ca, P, Zn, Ag, Cu, Fe, I, Bo, Mn, Mg, Se, Mo, K etc.

HITHERTO WE ARE TRYING WITH CITRIC ACID

I WILL TRY AND REVERT

VIJAY

It is not possible to reduce Ca, p, Zn, Fe, I ,Mg, K using formaldehyde. Citric acid can not reduce these metals. Citric acid is not a reducing agent.

We are using citric acid @ 60 Degrees  but end particle size is coming between 1 to 1000 micro meters.

Formaldehyde, HCl, H2SO4, Tri Sodium Citrate, Ascorbic acid we are not interested.

Will pressure and higher temperatures can achieve this?

Thanks and Best Regards for the support.

VIJAY

Interesting area and response

In literature exist a lot of articles with a large variety of reducing agents for synthesis of nanoparticles like : NaBH4, N2H4, CH2O, etc.

The size of nanoparticles synthesized from salts with reducing agents depend  of many aspects : nature of salts,  concentration of salt, speed  of mixing, concentration and types of reducing agent, the ration between reducing agent and salt, capping agents (concentration, ration and nature), temperature, titration type and speed etc. 

Dear Ion Ioana

Thanks for the useful guidance.

Regards

Vijay

What did you find exactly?