There are a bunch of reduction routes - probably best to use the ammine precursor rather than the nitrate in order for precise pH control. I'd be looking at 5% hydrazine hydrate as reducing agent - other reducing agents (especially NaBH4) can contaminate the surface. Absorb the ammine complex onto the dried support (SiO2, Al2O3 etc) such that the pore volume is just filled (I assume you know how to conduct a pore volume titration or that you have that information). Reduce with the appropriate material (H2 is another alternative). I worked on similar materials many years ago. For a general overview see:
February 18th, 2016 Metal colloids - their preparation, application and characterization
https://www.brainshark.com/malvern/vu?pi=529368070&b=1&tx=120486&c1=22
&
September 2nd, 2015 Silver colloids and invisible ink
https://www.brainshark.com/malvern/vu?pi=560497681&b=1&tx=120486&c1=22
At least you're working with nice pink colored staring material!
I'd prefer to use the ammine complex form rather than the nitrate directly for better pH control. Absorb the solution onto the dried support just filing the pore volume (I assume you know how to measure - pore volume titration - or calculate the pore volume). My preferred reducing agent would be 5% hydrazine hydrate or H2 in order to avoid contamination with other species (e.g. B from NaBH4). Wash with copious amount of DI water and dry the material. Characterize with BET (SSA - 6/D[3,2] and SEM. I worked on similar systems many years ago. For some generalities see:
February 18th, 2016 Metal colloids - their preparation, application and characterization
https://www.brainshark.com/malvern/vu?pi=529368070&b=1&tx=120486&c1=22
September 2nd, 2015 Silver colloids and invisible ink
https://www.brainshark.com/malvern/vu?pi=560497681&b=1&tx=120486&c1=22
At least you're working with a pretty pink starting material!
Apologies - RG seems to have posted this twice! And now a third post from me!
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