Static and Dynamic Properties of Oil Films Containing Organic Polar Compounds on Metal Surfaces, Using Electric Measurements

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Abstract
Using electric measurements, an oil film of liquid paraffin solutions of some surface active compounds was investigated in static, transitional, and dynamic states. In the static state, the film strength for mechanical deformation depended on the surface active compound in the oil. The adsorbed molecules in the oil film formed a multilayered film causing a mesomorphic state in the oil film. The oil film thickness in the transitional state was reduced by about 30 percent, in comparison with that in the static state. This reduction depended on which surface active compound was added. The film thickness decreased depending on the sliding velocity when it was below 30 cm/sec. The structure of an oil film below 30 cm/sec sliding velocity was considered to be in a dynamic equilibrium between the destruction or disturbance by a mechanical force and the molecular rearrangement or recovery of the structure.