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Bijan Das - One of the best experts on this subject based on the ideXlab platform.

Chanchal Das - One of the best experts on this subject based on the ideXlab platform.

Amalendu Pal - One of the best experts on this subject based on the ideXlab platform.

  • interaction between amphiphilic ionic liquid 1 butyl 3 methylimidazolium octyl sulfate and anionic polymer of sodium polystyrene sulfonate in aqueous medium
    Chemical Physics Letters, 2016
    Co-Authors: Z Barhoumi, M Saini, Noureddine Amdouni, Amalendu Pal
    Abstract:

    Abstract The Micellization of an aqueous solution of the surface active ionic liquid (SAIL), 1-butyl-3-methylimidazolium octylsufate (C4mim)(C8OSO3) and its interaction with an anionic polymer sodium polystyrene sulfonate, (NaPSS) were studied using conductimetry, tensiometry and fluorimetry. Surface tension profile shows a more dramatic increase in the value of surface tension of aqueous (C4mim)(C8OSO3) before the critical micelle concentration (cmc) of IL. The critical micelle concentration (cmc) value of this surfactant was found out from conductance measurements. The thermodynamic parameters, i.e., Gibb’s free energy, enthalpy, and entropy of Micellization of the IL in aqueous solution have been calculated. Behavior of fluorescence probe confirms the binding interactions between SAIL and the polyelectrolyte.

  • binding interaction between 1 octyl 3 methylimidazolium bromide and sodium polystyrene sulfonate in aqueous solution
    Fluid Phase Equilibria, 2016
    Co-Authors: Amalendu Pal, Sangeeta Yadav
    Abstract:

    Abstract Binding interactions between surface active ionic liquid (SAIL) [C8mim][Br] and sodium polystyrene sulfonate (NaPSS), an anionic polyelectrolyte were analyzed from techniques such as conductometry, tensiometry, dynamic light scattering (DLS) and fluorimetry. Typical surface tension profile shows the existence of noticeable elevation in the value of surface tension at IL concentrations before the critical micelle concentration (cmc) of the SAIL. By using conductivity measurements we have calculated the cmc and degree of ionization, α, at various temperatures from 298.15 to 318.15 K. A series of thermodynamic parameters like standard enthalpy of Micellization ( Δ H m ° ) , standard free energy of Micellization ( Δ G m ° ) and standard entropy of Micellization ( Δ S m ° ) have been evaluated. Behavior of fluorescence probe, pyrene and DLS measurements confirm the binding interactions between SAIL and the polyelectrolyte. It has been found that the cmc values significantly increase with higher concentration of polyelectrolyte due to hydrophobic interactions. The Gibb's free energy ( Δ G m ° ) is negative for the above systems and increases with increasing polyelectrolyte concentration.

Pradeep Rawat - One of the best experts on this subject based on the ideXlab platform.

Zhao Hua Ren - One of the best experts on this subject based on the ideXlab platform.

  • effect of isopropanol on the Micellization of binary mixture containing amino sulfonate amphoteric surfactant in aqueous solution mixing with octylphenol polyoxyethylene ether 7
    Journal of Molecular Liquids, 2017
    Co-Authors: Zhao Hua Ren, Jing Huang, Yan Cheng Zheng, Lu Lai
    Abstract:

    Abstract A systematic investigation of the effect of isopropanol (IPA) on the Micellization of binary mixtures of an amphoteric surfactant, sodium 3-( N -dodecyl ethylenediamino)-2-hydroxypropyl sulfonate (C12AS), with a nonionic surfactant, octylphenol polyoxyethylene ether having seven oxyethylene glycol ether (OP-7), the interaction between them, and thermodynamic parameters was performed in the water-IPA mixed solvent media (the concentration of IPA in bulk solution is within the range of 0 to 100 g/L) at 25 ± 0.2 °C. The values of critical micelle concentration ( cmc ) of individual surfactants and their mixtures were determined by both the tensiometry and the UV–vis spectrometry. According to the pseudophase separation and other theromdynamic models (including Clint's model, Rubingh's model, Maeda's model, etc.), molar fractions of components and activity coefficients in mixed micelle, interaction parameters between two surfactants, and thermodynamic parameters were calculated from the corresponding relationships. The variation of the cmc and the Micellization parameters with the concentration of IPA can be explained by the structure-breaking ability of IPA and the change in the conformation of C12AS. The synergistic effect between two surfactants can be observed and has a strong dependence on the concentration of IPA. Thermodynamic data show that the Micellization for the C12AS/OP-7 mixture is a entropy-driven spontaneous process. The addition of IPA is a disadvantage to the formation of mixed micelle. In comparison with the case in aqueous solution without IPA, the presence of IPA causes a remarkable contribution of entropy to the process of Micellization and the contribution increases with the concentration of IPA.

  • effect of isopropanol on the Micellization of binary mixture containing amino sulfonate amphoteric surfactant in aqueous solution mixing with sodium dodecylbenzene sulfonate
    Journal of The Taiwan Institute of Chemical Engineers, 2016
    Co-Authors: Zhao Hua Ren, Jing Huang, Yan Cheng Zheng, Lu Lai, Yue Luo, Ping Mei, Yan Ling Chang
    Abstract:

    Abstract The effect of isopropanol (IPA) on the Micellization behavior of binary surfactant mixtures of an amphoteric sodium 3-( N -dodecyl ethylenediamino)-2-hydropropyl sulfonate (C12AS) with an anionic sodium dodecylbenzene sulfonate (SDBS) was investigated in the water–IPA mixed solvent media (the concentration of IPA in bulk solution varies within the range of 0–100 g/L). The values of critical micelle concentration ( cmc ) of individual surfactants and their mixtures were determined by both the conductometry and the UV–vis spectrometry. Based on the regular solution theory, pseudophase separation model, and some thermodynamic models, the effect of IPA on the Micellization parameters and the thermodynamic parameters was theoretically discussed. The addition of IPA in aqueous solution not only changes the polar of solution but also influences the solvation of ionic surfactant, consequently resulting in the change in the mixed cmc values and the molar fraction of components in mixed micelle. The synergistic effect between two surfactants may be decreased with increasing IPA. Thermodynamic data show that the presence of IPA may be not an advantage to the spontaneous process of Micellization, and influences the contribution of entropy in the process of Micellization. Specially, these cases can be obviously observed at a high concentration of IPA in aqueous solution. These results help us to understand the advantage and the disadvantage of the effect of cosolvent (specially IPA) on the Micellization of mixed surfactants and to design the surfactant formulas relative to cosolvent.

  • synergistic effect between amino sulfonate amphoteric surfactant and octylphenol polyoxyethylene ether 10 in aqueous solutions with different acidicities consideration of different thermodynamic models
    Journal of Chemical Technology & Biotechnology, 2015
    Co-Authors: Zhao Hua Ren, Yan Cheng Zheng, Yue Luo, Ping Mei, Ding Po Shi
    Abstract:

    The Micellization behavior of binary mixtures of sodium n-dodecyl diamine sulfonate (C12AS) and octylphenol polyoxyethylene ether (10), OP-10, in aqueous solutions at pH 3.5, 6.0, and 8.5 was investigated, and the values of mixed critical micelle concentration (CM) were determined by both UV–vis spectroscopy using pyrene as a probe and by tensiometry. Within the framework of the pseudophase separation model, four thermodynamic models were adopted to describe the Micellization parameters including the interaction parameters (β12) between two surfactants, the components in real and ideal mixed micelles, the activity coefficients in mixed micelles, the thermodynamic parameters, and the thermodynamic stability. The experimental values of CM, inferior to the ideal values, show nonideal mixing; the negative values of β12 obtained from Rubingh's, Rodenas's, and Motomura's models mean the synergistic effect. Although there exist some divergences in the Micellization parameters predicted by the three treatments, similar results were obtained, indicating the validity of these models in this investigation. Based on the calculation errors, Rubingh's model is best to describe the interacting behavior between the two surfactants in this investigation. Thermodynamic parameters predicted by the three treatments show a spontaneous process of Micellization and an entropic contribution in the formation of mixed micelles. Different acidities of solutions result in different stabilities of Micellization. The stability in feeble acidic solution is higher than in acidic or basic solution, and the stability in basic solution is slightly superior to that in acidic solution. All the above described phenomena can be explained rationally by the electrostatic effect of head groups of C12AS, the steric effect of head group for two surfactants, the molecular structures of surfactants, the influence of added counterion, and so on. © 2015 Society of Chemical Industry