Conductivity Study of DTAB in Water and Ethanol-Water Mixture in the Presence and Absence of ZnSO4

Authors

Sangita Acharya, Department of Chemistry, M.M.A.M.C., Tribhuvan University, Biratnagar, NepalFollow
Tulasi Prasad Niraula, Department of Chemistry, M.M.A.M.C., Tribhuvan University, Biratnagar, NepalFollow
Ajaya Bhattarai, Department of Chemistry, M.M.A.M.C., Tribhuvan University, Biratnagar, NepalFollow

Abstract

The physicochemical behaviour of dodecyltrimethylammonium bromide (DTAB) in water and ethanol-water mixture in the presence and absence of ZnSO4 were studied by measuring the conductivity at 298.15 K. The pre-micellar (S1) and post-micellar slopes (S2) were obtained and calculated the degree of dissociation (α) and the critical micelle concentration (cmc). With an increase in ethanol content, the cmc and α of DTAB increased whereas, in the presence of ZnSO4, the cmc and α decreased. By using cmc and α, thermodynamic properties as the standard free energy of micellization ( ) were evaluated. With an increase in ethanol content, the negative values of are decreased indicating less spontaneous in the micellization which makes micellization less favourable. The correlation of the pre-micellar and post-micellar slopes with the volume fraction of ethanol were discussed. DTAB micellization was tested in contexts of specific solvent parameters and solvophobic parameter.

Keywords

DTAB, Ethanol-water, Solvent parameters, Solvophobic parameter, ZnSO4

Article Type

Article

How to Cite this Article

Acharya, Sangita; Prasad Niraula, Tulasi; and Bhattarai, Ajaya (2020) "Conductivity Study of DTAB in Water and Ethanol-Water Mixture in the Presence and Absence of ZnSO4," Baghdad Science Journal: Vol. 17: Iss. 4, Article 21.
DOI: https://doi.org/10.21123/bsj.2020.17.4.1207