Influence of solvent permittivity and divalent salt on micellization behavior of sodium dodecyl sulfate: Conductivity measurements and simulation study
Autor: | Ranjit De, Ajaya Bhattarai, Tulasi Prasad Niraula, Dileep Kumar, Marlene Ríos-López, Renu Shah, Hector Dominguez, Ana Beatriz Salazar-Arriaga |
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Rok vydání: | 2022 |
Předmět: |
chemistry.chemical_classification
Ethanol Analytical chemistry Salt (chemistry) Conductivity Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Solvent chemistry.chemical_compound Pulmonary surfactant chemistry Critical micelle concentration Materials Chemistry Physical and Theoretical Chemistry Sodium dodecyl sulfate Solvophobic Spectroscopy |
Zdroj: | Journal of Molecular Liquids. 349:118186 |
ISSN: | 0167-7322 |
Popis: | Precise conductivity measurements of sodium dodecyl sulfate (SDS) solutions with and without manganese sulfate in water and ethanol-water mixture containing (10, 20 and 30) volume % ethanol is carried out at 298.15 K. The conductance decreased on the addition of ethanol with and without salt. From the pre-micellar and post-micellar slopes, the degree of dissociation (α) of SDS was calculated. On increasing the ethanol content, the α and critical micelle concentration (CMC) increased whereas they decreased with the addition of salt. Utilizing these CMC and α values, the standard free energy of micellization ( Δ G m ° ) was assessed. The negative values of Δ G m ° decreased when ethanol whereas increased with salt were added. Micellization of SDS was tested for several solvent parameters and solvophobic parameter. The free energy of surfactant tail transfer ( Δ G trans ° ) was also evaluated. Conductivity data were also estimated with molecular dynamics simulations from GROMACS-5 software and the results showed good agreement with the experimental values. |
Databáze: | OpenAIRE |
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