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Abstract The interfacial tension of prepared compounds solutions was determined by using tensiometer and the values were recorded. We can notice that by increasing length of carbon chain from (CH2)6 to (CH2)9 the interfacial tension decreases due to increasing hydrophobicity of the molecule (due to increasing number of fatty groups) in surfactants have the same ratio of amino group leads to slight increase in IFT . Critical micelle concentration (Ccmc) The surface-active parameters of cationic gemini surfactants have been investigated by surface tension measurements at room temperatures. The most effective surfactant is one that gives the greater lowering in surface tension for a critical micelle concentration (CMC). According to the results, Oleic cationic surfactant is the most effective surfactant. Stability to hydrolysis: To study its hydrolysis, all of the synthesized Gemini-cationic surfactants were exposed to basic and acidic media. According to the ester linkage in all synthesized surfactants is easily hydrolysis in acidic medium and it stability in acidic medium, as shown in (Table2). All of the surfactants under this study showed high stability in basic media. The hydrolysis test also shows that as fatty chain length increases, hydrolysis in both acidic and basic media becomes more stable. the prepared Gemini cationic surfactants are affected by the basic media rather than the acidic media but surfactants (Ⅴa &Ⅴe) possess high extent of stabilization in their structure for more than 24 h. |