I would like to find an exothermic reaction which can reach upwards of 150-200 degrees Celsius for a short period of time (5-15 minutes). I would like to heat up only 0.05 grams of a certain material.
I so far have been researching a "supercharged" iron oxidation reaction with a salt catalyst in aqueous environment (or with activated charcoal with water in the pores).
I have also been looking into Potassium Ferrate reduction with water, but I am not sure if this will produce heat.
I know that hand-warmer companies have engineered the packets to not get too hot too fast, and to last for hours. I wish to do the OPPOSITE, create a very speedy oxidation reaction which produces a lot of heat very quickly, and then subsides.
Would anyone have any expertise or input on this? I am trying to avoid seriously toxic components, but any suggestions are super helpful.
Thanks in advance everyone.