Influence of solvent permittivity and divalent salt on micellization behavior of sodium dodecyl sulfate: Conductivity measurements and simulation study
Por:
Niraula, Tulasi Prasad, Shah, Renu, Kumar, Dileep, Dominguez, Hector, Rios-Lopez, Marlene, Salazar-Arriaga A.B., De, Ranjit, Bhattarai, Ajaya
Publicada:
1 ene 2022
Resumen:
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 (a) of SDS was calculated. On increasing the ethanol content, the a and critical micelle concentration (CMC) increased whereas they decreased with the addition of salt. Utilizing these CMC and a values, the standard free energy of micellization ( Gm°) was assessed. The negative values of Gm° 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 ( Gtrans°) 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. © 2021 Elsevier B.V.
Filiaciones:
Niraula, Tulasi Prasad:
Department of Chemistry, M. M. A. M. C, Tribhuvan University, Biratnagar, Nepal
Shah, Renu:
Department of Chemistry, M. M. A. M. C, Tribhuvan University, Biratnagar, Nepal
Kumar, Dileep:
Division of Computational Physics, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Viet Nam
Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Viet Nam
Dominguez, Hector:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, cd. Mx, 04510, Mexico
Rios-Lopez, Marlene:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, cd. Mx, 04510, Mexico
Salazar-Arriaga A.B.:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, cd. Mx, 04510, Mexico
De, Ranjit:
Department of Life Sciences, Pohang University of Science and Technology (POSTECH), Cheongam-Ro 77, Pohang, Gyeongbuk 37673, South Korea
Bhattarai, Ajaya:
Department of Chemistry, M. M. A. M. C, Tribhuvan University, Biratnagar, Nepal
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