Micellization and mixed micellization of cationic gemini (dimeric) surfactants and cationic conventional (monomeric) surfactants: Conductometric,dye solubilization,and surface tension studies |
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| Authors: | Md Sayem Alam A Mohammed Siddiq R Ragupathy |
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| Institution: | 1. Council of Scientific and Industrial Research (CSIR) — Central Leather Research Institute (CLRI), Industrial Chemistry Laboratory, Adyar, Chennai, India;2. Chemical Sciences, Academy of Scientific and Innovative Research (AcSIR), New Delhi, Indiasayemalam@gmail.com;5. sayem@clri.res.in;6. Council of Scientific and Industrial Research (CSIR) — Central Leather Research Institute (CLRI), Chemical Laboratory, Adyar, Chennai, India |
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| Abstract: | In the present study, we have investigated the self-association, mixed micellization, and thermodynamic studies of a cationic gemini (dimeric) surfactant, hexanediyl-1,6-bis(dimethylcetylammonium bromide (16-6-16)) and a cationic conventional (monomeric) surfactant, cetyltrimethylammonium bromide (CTAB). The critical micelle concentration (CMC) of pure (16-6-16 and CTAB) and mixed (16-6-16+CTAB) surfactants was measured by electrical conductivity, dye solubilization, and surface tension measurements. The surface properties (viz., C20 (the surfactant concentration required to reduce the surface tension by 20 mN/m), ΠCMC (the surface pressure at the CMC), Γmax (maximum surface excess concentration at the air/water interface), Amin (the minimum area per surfactant molecule at the air/water interface), etc.) of micellar (16-6-16 or CTAB) and mixed micellar (16-6-16+CTAB) surfactant systems were evaluated. The thermodynamic parameters of the micellar (16-6-16 and CTAB) and mixed micellar (16-6-16+CTAB) surfactant systems were also evaluated. |
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| Keywords: | Critical micelle concentration CTAB gemini surfactant mixed micelles thermodynamics 16-6-16 |
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