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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 deg C of an oil drop at a smooth planar solid surface in contact with air is
deg At this temperature: The surface tension of the oil is mJm The surface energy of the sold material is mJm The oilwater interfacial energy is mJm The solidwater interfacial energy is mJm All phases can be considered totally immiscible.
aCalculate the interfacial energy of the oilsolid interface at C
b Calculate the spreading coefficient for oil at the solidwater interphase for the given system. Does oil spread at the solidwater interface?
c When a surface active substance a detergent is dissolved in the water, it adsorbs at both the oilwater and solidwater interfaces. The solidwater 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 oilwater interfacial energy that the detergent should achieve?
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