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Faraday induced the mechanochemical reduction of AgCl with Zn, Sn, Fe and Cu in 1820, using trituration in a mortar. This experiment is revisited, employing a mortar-and-pestle and a ball mill as mechanochemical reactors. The reaction kinetics depends both on the thermochemical properties and the hardness of the reactants. When using Zn as the reducing agent, Faraday likely observed a mechanically induced self-sustaining process (MSR), or at least he came very close to doing so.

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self-sustaining reaction additive-free NZ-1 mixture was firstly investigated. The maximum temperature of reaction determined from the time–temperature distribution ( Fig. 1 ) for that mixture is about 920 °C ( Table 1 ). PTFE addition rises the maximum

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