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Ali, Anwar
- Investigation of Micellization Properties of some Ionic Surfactants in Water + Formamide Solutions at Various Temperatures
Abstract Views :173 |
PDF Views:2
Authors
Anwar Ali
1,
Anil Kumar Nain
1
Affiliations
1 Department of Chemistry, Jamia Millia Islamia, P.O. Box No. 9788, Jamia Nagar, New Delhi-110025, IN
1 Department of Chemistry, Jamia Millia Islamia, P.O. Box No. 9788, Jamia Nagar, New Delhi-110025, IN
Source
Journal of Surface Science and Technology, Vol 13, No 1 (1997), Pagination: 1-9Abstract
The critical micelle concentration (CMC) of sodium dodecyl sulphate (SDS) and cetyltrimethylammonium bromide (CTAB) in water, 25, 50 and 75% (v/v) formamide (FA) + water and pure FA has been determined at various temperatures by means of specific conductivity measurements. The standard free energy (ΔG0m), enthalpy (ΔH0m) and entropy of micellization (ΔS0m) were calculated from these data. The experimental results indicate that the CMC of both the ionic surfactants, SDS and CTAB, initially increases then decreases as the concentration of the organic solvent, FA in water is increased. The trends in the values of ΔG0m, ΔH0m and ΔS0m indicate that the micellization of SDS and CTAB in FA + water mixture is an entropy-directed process. Furthermore, the effect of temperature on micellization has also been discussed.Keywords
Critical Micelle Concentration, Ionic Surfactants, Formamide + Water Mixtures, Micellization.- Thermal Expansivity and Isothermal Compressibility of Binary Liquid Mixtures from Ultrasonic Velocity:A Comparison to Flory's Theory and Hard Sphere Models
Abstract Views :157 |
PDF Views:0
Authors
Anwar Ali
1,
Mohd Tariq
1
Affiliations
1 Department of Chemistry, Jamia Millia Islamia, Jamia Nagar, New Delhi-110025, IN
1 Department of Chemistry, Jamia Millia Islamia, Jamia Nagar, New Delhi-110025, IN
Source
Journal of Pure and Applied Ultrasonics, Vol 28, No 2-4 (2006), Pagination: 99-104Abstract
Thermal expansion coefficient and isothermal compressibility of binary liquid mixtures of varying nature have been calculated using density and ultrasonic speed data. Excess thermal expansivity, and isothermal compressibility of binary liquid mixtures have also been calculated and the results are interpreted in terms of strength of molecular interactions between the component molecules of the liquid mixtures. Moreover, thermal expansion coefficient and isothermal compressibility of pure liquids and liquid mixtures has been calculated using Flory's theory and various hard sphere models. The results are useful in predicting the superiority of Flory's theory over the hard sphere models in predicting the above properties.- Ultrasonic Study of Intermolecular Interactions on Non-Aqueous Binary Liquid Mixtures at 30°C
Abstract Views :152 |
PDF Views:0
Authors
Affiliations
1 Department of Chemistry, Jamia Millia Islamia (Central University), Jamia Nagar, New Delhi-100025, IN
1 Department of Chemistry, Jamia Millia Islamia (Central University), Jamia Nagar, New Delhi-100025, IN