Adsorption Free Energy of Resins

4a Adsorption free energy of resins. When ng resin molecules adsorb onto the surface of the micellar core at constant temperature and pressure, without consideration of the interfacial effect, the Gibbs free energy change is given by n.2[ Ah )afjs The adsorption of 

In the above equation, (A/i5)adg is a measure of heat interaction between asphaltene and resin molecules. The adsorbed resin molecules generate steric repulsion among the polar heads, which results in a loss of entropy compared with the unadsorbed molecule the entropy change is shown by (ASr)ads- While (Ah ) can be measured directly or estimated as we will see later, Asr)ads calculated from (Nagara- 

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