The Self-Association and Mixed Micellization of an Anionic Surfactant,Sodium Dodecyl Sulfate,and a Cationic Surfactant,Cetyltrimethylammonium Bromide: Conductometric,Dye Solubilization,and Surface Tension Studies |
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| Authors: | Md Sayem Alam R Ragupathy Asit Baran Mandal |
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| Institution: | 1. Council of Scientific and Industrial Research (CSIR)—Central Leather Research Institute (CLRI), Industrial Chemistry Laboratory, Chennai, India;2. Academy of Scientific and Innovative Research (AcSIR), New Delhi, Indiasayemalam@gmail.com sayem@clri.res.in;4. Council of Scientific and Industrial Research (CSIR)—Central Leather Research Institute (CLRI), Chemical Laboratory, Chennai, India;5. Council of Scientific and Industrial Research (CSIR)—Central Leather Research Institute (CLRI), Chemical Laboratory, Chennai, India |
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| Abstract: | In the present study, we investigate the self-association and mixed micellization of an anionic surfactant, sodium dodecyl sulfate (SDS), and a cationic surfactant, cetyltrimethylammonium bromide (CTAB). The critical micelle concentration (CMC) of SDS, CTAB, and mixed (SDS + 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), and Amin (the minimum area per surfactant molecule at the air/water interface)) of SDS, CTAB, and (SDS + CTAB) micellar/mixed micellar systems were evaluated. The thermodynamic parameters of the micellar (SDS and CTAB), and mixed micellar (SDS + CTAB) systems were evaluated.A schematic representation of micelles and mixed micelles. |
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| Keywords: | Critical micelle concentration CTAB mixed micelles SDS thermodynamics |
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