Group I surfactant

A comparison for a group I surfactant, sulfonated 5(p ethylphenyl) dodecane is in figure 6. These three sets of data are typical of the results. Three things may be noted. 

Figure 6. Comparison of alkane and crude oil tensions for a Group I surfactant, sulfonated 5(p-ethylphenyl)dodecane...

A special group of lipids that possess both hydrophilic and hydrophobic (lipophilic) parts are termed as amphiphiles or amphipathics and are also referred to as surfactants. They adsorb at surfaces or interfaces and change the interfacial free energy associated with the building of an interface. A surfactant molecule consists of two distinct chemical groups (i) the head which is hydrophilic (water-loving) and (ii) the tail which is hydrophobic (water-fearing). 

Surfactants are usually classified into three main groups—i.e., anionic, cationic, and nonionic, depending on their ionic nature in solution. A fourth group is sometimes included, and these are called amphoteric surfactants, which show both anionic and cationic properties depending on pH. 

We chose to compare some surfactants of group I—represented by compound b) of figure 3 and other of similar structure (13)—with some of group II—similar to compound c) of figure 3. The crude oils used are Used in table I, together with their EACNs (13). 

Stucky and coworkers proposed that under certain conditions (usually strongly acidic), an electrical double layer develops between the surface of the oxide and surfactant head groups (i.e., The templates used... 

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