Cyclic voltammetry and viscosity measurements of aggregated assemblies of anionic surfactants with nonionic surfactants and triblock copolymers |
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Authors: | Rabia Sharma Arifa Shaheen Rakesh Kumar Mahajan |
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Institution: | (1) Department of Chemistry, Guru Nanak Dev University, Amritsar, 143005, India; |
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Abstract: | Cyclic voltammetry (CV) and viscosity measurements have been employed to study the aggregation behavior of mixed micellar
systems of anionic surfactant (dioctyl sulfosuccinate sodium salt, AOT) with conventional nonionic surfactants such as Brij
35/TritonX-100/Tween 20/Tween 80/Myrj 45 and two triblock copolymers (L64 and F68). Critical micelle concentration (cmc) values
have been determined for various micellar systems from CV measurements using 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO)
as an electroactive probe at 25 °C. Diffusion coefficient (D) has been evaluated from Randles–Sevcik equation which showed an overall decrease for most of the binary systems. The negative
values of interaction parameters (β) obtained from regular solution theory suggest the synergistic behavior in all the binary systems except AOT + Tween 80 mixtures.
The mixed systems of AOT with triblock copolymers showed stronger synergistic interactions than that of mixed systems of AOT
with nonionic surfactants. A comparative evaluation of mixed systems of anionic surfactants AOT and sodium dodecyl sulfate
with Myrj 45 and AOT + L64 and F68 has been made on the basis of different micellar parameters and structural properties of
surfactants. Viscosity measurements also show similar type of interactions in the mixed micelles. |
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Keywords: | |
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