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The contact angle at 2 5 deg C of an oil drop at a smooth planar solid surface in contact with air is 3

The contact angle at 25\deg C of an oil drop at a smooth planar solid surface in contact with air is
30\deg . At this temperature: The surface tension of the oil is 25.0 mJ/m?. The surface energy of the sold material is 30.0 mJ/m?. The oil-water interfacial energy is 50.0 mJ/m'. The solid-water interfacial energy is 65 mJ/m'. All phases can be considered totally immiscible.
(a)Calculate the interfacial energy of the oil-solid interface at 25 C
(b) Calculate the spreading coefficient for oil at the solid-water interphase for the given system. Does oil spread at the solid-water interface?
(c) When a surface- active substance (a detergent) is dissolved in the water, it adsorbs at both the oil-water and solid-water interfaces. The solid-water interfacial energy becomes effectively zero. If the aim of adding detergent is to remove an oil film from the solid surface, what is the maximum oil-water interfacial energy that the detergent should achieve?

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