Interaction of normal and reverse pluronics (L44 and 10R5) and their mixtures with anionic surfactant sodium N-dodecanoylsarcosinate

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• 作者：Bappaditya Naskar ; Soumen Ghosh ; Satya P. Moulik
• 关键词：Pluronics ; SDDS ; Pluronic&ndash ; SDDS interaction ; CAC ; CS ; CMCe ; Energetics ; DLS ; Zeta potential
• 刊名：Journal of Colloid and Interface Science
• 出版年：15 January, 2014
• 年：2014
• 卷：414
• 期：Complete
• 页码：82-89
• 全文大小：1259 K

文摘

Interaction of monomeric normal L44 [(PEO)₁₀(PPO)₂₃(PEO)₁₀]) and reverse 10R5 [(PPO)₈(PEO)₂₂(PPO)₈] pluronics designated as L and R, respectively, and their mixtures with the anionic surfactant sodium N-dodecanoylsarcosinate (SDDS) in aqueous medium has been studied by tensiometry, conductometry, calorimetry and dynamic light scattering methods. The critical aggregation concentration (CAC), concentration of maximum binding (C_S), and the extended critical micelle concentration (CMC_e) of SDDS resulted from the interaction have been presented. L has shown the formation of CAC, C_S and CMC_e, whereas R has shown the absence of CAC but the presence of both C_S and CMC_e. Micellization of SDDS is an endothermic process whereas the formation of CAC and CMC_e is exothermic events, the formation of C_S is endothermic. The hydrodynamic diameter (D_h) and zeta potential of L and R, and their SDDS interacted species have been determined. D_h decreased with increasing SDDS concentration for L whereas it was invariant for R. Mixed L and R in varied proportions have been also examined in the solution state to probe into their mutual interaction, and interaction with SDDS. The formation of CAC of their mixtures was absent; CMC_e formation was exothermic while that of C_S was endothermic like their individuals.