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Nain, Anil Kumar
- Investigation of Micellization Properties of some Ionic Surfactants in Water + Formamide Solutions at Various Temperatures
Abstract Views :170 |
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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.
- Ultrasonic Study of Intermolecular Interactions on Non-Aqueous Binary Liquid Mixtures at 30°C
Abstract Views :147 |
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
Source
Journal of Pure and Applied Ultrasonics, Vol 26, No 2-3 (2004), Pagination: 40-48Abstract
The ultrasonic speeds, U and densities, ρ of pure benzene, n-butanol, iso-butanol, sec-butanol and tert-butanol and their binary mixtures with benzene as a common component were measured at 30°C over the whole composition range. The dependence of ultrasonic speed on composition of the mixture was checked by using an empirical relation. From the experimental data, the values ofisentropic compressibility, ks, intermolecular free length, Lf, relative association, RA, acoustic impedance, Z, molar sound speed, Rm, deviations in isentropic compressibility, Δks, excess intermolecular free length, LEf, deviations in ultrasonic speed, ΔU, excess acoustic impedance, ZE, apparent molar compressibilities, K∅,1 and K∅,2 and partial molar compressibilities, ̅K°∅,1 and ̅K°∅,2 of benzene in alcohols and alcohols in benzene, respectively, at infinite dilution were calculated. The variation of these parameters with composition indicates the presence of weak interactions between the component molecules and this interaction decrease in the order: n-butanol>iso-butaitol>sec-butanol>tert-butanol. Further, the ultrasonic speeds in these mixtures were theoretically calculated with the help of several theories and empirical relations by using data on pure components. The relative merits of these theories and relations for the present systems have been discussed.Full Text
- Correlation between molecular interactions and excess thermodynamic parameters of binary mixtures
Abstract Views :144 |
PDF Views:1
Authors
Affiliations
1 Department of Chemistry, Dyal Singh College (University of Delhi), New Delhi - 110 003, IN
2 Department of Chemistry, Amity University Dubai Campus, Dubai International Academic City, Dubai, AE
1 Department of Chemistry, Dyal Singh College (University of Delhi), New Delhi - 110 003, IN
2 Department of Chemistry, Amity University Dubai Campus, Dubai International Academic City, Dubai, AE
Source
Journal of Pure and Applied Ultrasonics, Vol 43, No 1-2 (2021), Pagination: 8-16Abstract
Excess thermodynamic parameters, viz., internal pressures, πi, free volumes, Vf, excess internal pressures, πiE, excess free volumes, VfE, excess free energy, GE, excess enthalpy, HE and entropy, SE of mixing for the binary mixtures of 1,4-dioxane with aromatic hydrocarbons (benzene, toluene, o-xylene, m-xylene, p-xylene and mesitylene) have been evaluated from experimental ultrasonic speed and density data over the whole composition range at 298.15 K. The results are interpreted from the point of view of prevailing intermolecular interactions between unlike molecules in the mixture. Electron donor-acceptor type (or charge-transfer) interactions between 1,4-dioxane (acting as donor) and the π-electrons of ring of aromatic hydrocarbon molecules (acting as acceptor) have been observed and the magnitude of these interactions in the mixtures follow the order: benzene > toluene > p-xylene > m-xylene > o-xylene > mesitylene.Keywords
Aromatic hydrocarbons, excess properties, free volume, internal pressure, molecular interactions, 1,4-Dioxane.Full Text
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