Mean polar head group area

The mean polar head group area in a water/decanol/potassium oleate system is approximately 26 A for an alcohol/soap molecular ratio of 2.l — For the soap alone an area of 36.0 3 was found. Assuming a linear relationship a value of 22 A is obtained for the decanol. This value will be used also for the pentanol. The volume, chain length and area can now be estimated ... 

The first molecular interaction model was developed by Nagarajan [3, 4, 5]. For the description of the microstructure of the complex the necklace model was adopted. The free-energy expression developed earlier for micelles was modified in order to incorporate the interaction with the polymer. This interaction was described by two parameters. One of them was the micelle-core area shielded by the polymer and the other one was an interaction parameter due to the hydrophobic contribution of the polymer segments interacting with the core. The shielding of the micelle core has two opposite effects on the micelle formation. On the one hand, it reduces the contact area between the hydrophobic micelle core and water on the other hand, it increases the polar head group interactions. Since the shielding parameter is some kind of mean value, at present no a priori method for the estimation of this area is available ... 

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