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Molecular beam studies carried out in ultrahigh vacuum show that dimethyl disulfide reacts with initially clean iron to evolve methane. The reaction is proposed to proceed via a methyl thiolate intermediate. Reaction ceases at ∼600 K, an effect that is proposed to be due to the surface being blocked by an overlayer of sulfur and carbon. Reaction recommences above ∼950 K as sulfur diffuses into the...
The temperature T between the lubricated surfaces in a pin and v-block apparatus is given, for any lubricant at an ambient temperature of T 0 , by the formula T = T 0 + KrωμL where r is the radius of the pin, ω its rotational angular velocity, K a constant that depends on the thermal conductivity in the region of the contact between the pin and the v-block and L the applied load. The...
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