Micellization Properties, Molal Volume and Polarizability of Newly Synthesized Gemini-Cationic Surfactants

In the present study, three Gemini cationic surfactants were prepared and characterized: N,N'-((1,4-phenylenebis(oxy))bis(2-oxoethane-2,1-diyl))bis(N,N-dimethyl-3-octanamidopropan-1-aminium) (C1), N,N'-((1,4-phenylenebis(oxy))bis(2-oxoethane-2,1-diyl))bis(3-dodecaneamido-N,N- dimethylpropan-1-aminium) (C2),N,N'-((1,4-phenylenebis(oxy))bis(2-oxoethane-2,1-diyl)) bis(N,N-dimethyl-3-palmitamidopropan-1-aminiccum)(C3). In water solutions, the CMC value of the prepared surfactants was detected by conductivity, surface tension, refractive index, molal volume, and spectrophotometric measurements. The effect of mixing of Gemini surfactant on CMC value was studied and discussed. Some surface properties of surfactants like excess surface concentration and minimum area per molecule were also calculated and discussed. Solvation thermodynamic parameters such as association constant, molal volume, and polarizability were also determined and discussed. The CMC value decreased from C-1 to C-3 due to an increase in the carbon chain length. Different physical methods show good agreement between CMC values detected by several techniques effect of mixing surfactants on CMC was also studied For example detecting CMC value for C-1 when C-2 and C-3 are added at two concentrations, before and after the CMC values of the added surfactants, (0.00001M, 0.0003M) in water solution. and so on.

Automated summary

In this study, three Gemini cationic surfactants were synthesized and their critical micelle concentration (CMC) values in aqueous solutions were determined using various techniques. The effects of mixing these surfactants on CMC values were also investigated. Additionally, surface properties and solvation thermodynamic parameters of the surfactants were calculated and discussed.