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Vol. 26 No. 19 (2014): Vol 26 Issue 19

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Applications of Different Techniques in Estimation of Aggregation and Thermodynamic Behaviour of Brij 58 at Different Temperatures

https://doi.org/10.14233/ajchem.2014.16486
Aisha Niazi
Department of Chemistry, Gomal University, D.I. Khan, Pakistan
Abdur Rauf
Department of Chemistry, Gomal University, D.I. Khan, Pakistan; Department of Chemistry, University of Science and Technology, Bannu-28100, Pakistan
Gulrez Fatima Durani
Department of Chemistry, Gomal University, D.I. Khan, Pakistan
Musa Kaleem Baloch
Department of Chemistry, Gomal University, D.I. Khan, Pakistan
Saleem Jan
Department of Chemistry, University of Science and Technology, Bannu-28100, Pakistan

Corresponding Author(s) : Aisha Niazi

qadran2@gmail.com

Asian Journal of Chemistry, Vol. 26 No. 19 (2014): Vol 26 Issue 19

Abstract

Surface tension, electrical conductivity and differential scanning calorimetry were measured for aqueous solution of surfactant Brij 58 at different temperatures. The surface tension of surfactant decreases and conductance increases as the concentration of the surfactant increases. The breakpoint, appeared in surface tension and conductivity vs. concentration plot, indicated the formation of molecular aggregates which are comparable and reproducible. Different thermodynamic parameters like pCMC, G, amin, DG°ads DH°ads DS°ads were calculated, which showed that DG°mic values of solutions was negative and became more negative with increase in temperature, whereas, DH°mic remained positive at all temperatures. The surface excess concentration (G) was increased, which indicated the depletion of molecules from the bulk to the surface. The enthalpy change calculated by instrument was endothermic which supported our finding.

Keywords

Surfactants Thermodynamics Critical micelles concentration Micellizatiom
Niazi, A., Rauf, A., Fatima Durani, G., Kaleem Baloch, M., & Jan, S. (2014). Applications of Different Techniques in Estimation of Aggregation and Thermodynamic Behaviour of Brij 58 at Different Temperatures. Asian Journal of Chemistry, 26(19), 6535–6540. https://doi.org/10.14233/ajchem.2014.16486
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