[Khai]

Hi guys,

I'm working on combustion with mixture of silver and aluminium. But I'm having problem on the mechanism since I'm clueless about the chemical reaction between the mixtures. Because Al + O2 = Al2O3, if silver is involved the reaction, how would be the chemical equation?
Please help me 

[Borek]

I am not aware of any reaction "between silver and aluminum". I wouldn't be surprised by some mild oxidation of silver in high temperatures though, and quick googling confirms existence of Ag-O-Al bonds in Ag/Al/O mixtures, but they are non-stoichiometric and their amount will for sure depend on the sample history (ie method of preparation).

[Enthalpy]

Or could a small amount of Ag let Al burn more easily by spoiling the oxide layer on Al? Similar to the effect of Ga, then.
Or is it a silver oxide that reacts with metallic aluminium, in a thermite reaction?

[Khai]

Or could a small amount of Ag let Al burn more easily by spoiling the oxide layer on Al? Similar to the effect of Ga, then.
Or is it a silver oxide that reacts with metallic aluminium, in a thermite reaction?

Thanks for the ideas. Actually the second question has been in my mind for a long time  But still no answer.
For the first one, no idea on the effect of Ga. Mind to share a little bit to give brief idea? Will do more research later on.

Thanks a lot.

[Khai]

I am not aware of any reaction "between silver and aluminum". I wouldn't be surprised by some mild oxidation of silver in high temperatures though, and quick googling confirms existence of Ag-O-Al bonds in Ag/Al/O mixtures, but they are non-stoichiometric and their amount will for sure depend on the sample history (ie method of preparation).

Thanks for the ideas. I was thinking about the mild oxidation but to find the justification is a challenge.
Anyway, the Ag-O-Al bond that you mentioned, based on method of preparation, I can't understand well. May I have more explanation?

[Borek]

http://ase.tufts.edu/nano-cel/publications/roleOfAg-O-AlSpecies.pdf

[Khai]

http://ase.tufts.edu/nano-cel/publications/roleOfAg-O-AlSpecies.pdf

Thanks a lot.