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Bijan Das - One of the best experts on this subject based on the ideXlab platform.
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concentration medium and salinity induced shrinkage expansion of poly sodium styrenesulfonate in 2 Ethoxyethanol water mixed solvent media as probed by viscosimetry
Journal of Molecular Structure, 2020Co-Authors: Bijan DasAbstract:Abstract Hydrodynamic properties of a charged polymer poly (sodium styrenesulfonate) have been investigated in aqueous 2-Ethoxyethanol solutions with an added electrolyte using viscosimetric technique to explore the structural alternations of polystyrenesulfonate ions in mixed solvent media. The viscosity data were analyzed in view of the laws of phenomenological thermodynamics which helped access the hydrodynamic behavior of an isolated polyion, as well as the changes in polyion dynamics in presence of neighboring polyions. An increase of the (i) 2-Ethoxyethanol-content of the media, or (ii) polyelectrolyte concentration, or (iii) salinity of the medium causes a reduction of the hydrodynamic dimensions of the polyion chains. Polyion chains become more compact with the increase in the amount of 2-Ethoxyethanol of the media. Salinity has been shown to have the most prominent influence on the hydrodynamics of the system investigated. The extent of relative chain shrinkage with increasing poly (sodium styrenesulfonate) concentration is least pronounced in the medium with the highest salinity. Sufficient screening of the electrostatic interactions by adding extra salt results in a less favorable interaction of the methylene and methyl groups of the polyelectrolyte molecules with the media.
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coiling uncoiling behaviour of sodium polystyrenesulfonate in 2 Ethoxyethanol water mixed solvent media as probed using viscometry
Polymer International, 2014Co-Authors: Bijan DasAbstract:Precise measurements of the viscosities of solutions of sodium polystyrenesulfonate in water and in 2-Ethoxyethanol–water mixtures containing varying amounts of 2-Ethoxyethanol have been performed at 308.15, 313.15, 318.15 and 323.15 K. The intramolecular contributions to the reduced viscosities of the polyelectrolyte solutions were obtained through isoionic dilution maintaining the total ionic strengths of the solutions at polyelectrolyte concentrations of 0.0033, 0.0054 and 0.0080 eq L−1 with sodium chloride. The Huggins constants were also obtained from the experimental data. The influences of the medium and the temperature on the intramolecular contributions to the reduced viscosities as well as on the Huggins constants have been interpreted from the points of view of the conformational characteristics and polyelectrolyte–solvent and polyelectrolyte–polyelectrolyte interactions prevailing in the polyelectrolyte solutions under investigation. Polyion chains were found to coil upon addition of 2-Ethoxyethanol to water or upon an increase of temperature. Thermodynamic affinities for polyelectrolyte–solvent and polyelectrolyte–polyelectrolyte interactions were found to depend greatly on the medium. © 2014 Society of Chemical Industry
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electrical conductances of sodium polystyrenesulfonate in 2 Ethoxyethanol 1 water 2 mixed solvent media in the presence of sodium chloride at 308 15 313 15 318 15 and 323 15 k
Journal of Chemical & Engineering Data, 2010Co-Authors: Bijan DasAbstract:The electrical conductances of solutions of an anionic polyelectrolyte sodium polystyrenesulfonate in 2-Ethoxyethanol (1) + water (2) mixed solvent media containing (0.25, 0.40, and 0.50) mass fractions of 2-Ethoxyethanol (w1) have been reported at (308.15, 313.15, 318.15, and 323.15) K in the presence of sodium chloride. The conductance data have been analyzed on the basis of an equation developed in this study following the model for the electrical conductivity of salt-free polyelectrolyte solutions using the scaling description for the configuration of a semidilute polyion chain according to Dobrynin et al. (Macromolecules 1995, 28, 1859−1871). Excellent quantitative agreement between the experimental results and those obtained using the equation developed here was observed.
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viscosities of tetrabutylammonium bromide sodium tetraphenylborate and sodium bromide in 2 Ethoxyethanol water mixed solvent media at 308 15 313 15 318 15 and 323 15 k
Journal of Molecular Liquids, 2008Co-Authors: Purushottam Haldar, Bijan DasAbstract:Abstract The viscosities of the solutions of tetrabutylammonium bromide (Bu4NBr), sodium tetraphenylborate (NaBPh4), sodium bromide (NaBr) in 2-Ethoxyethanol + water mixed solvent media containing 0.25, 0.50 and 0.75 mass fractions of 2-Ethoxyethanol (w1) have been reported at 308.15, 313.15, 318.15, and 323.15 K. The viscosity data have been analyzed by the Jones–Dole equation for the associated electrolytes to evaluate the viscosity B-coefficients of the electrolytes. These data have also been analyzed by the transition-state treatment to obtain contribution of the solutes to the free energy of activation for viscous flow of the solution. The viscosity of the solvent is found to be greatly modified by the presence of the tetrabutylammonium, tetraaphenylborate and bromide ions; sodium ion, on the other hand, is not such efficient in modifying the viscosity of the media investigated. Moreover, these ions behave neither as structure-breaker nor as structure-maker and the formation of the transition-state is made less favorable in their presence in aqueous 2-Ethoxyethanol solutions.
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electrical conductances of tetrabutylammonium bromide and tetrapentylammonium bromide in 2 Ethoxyethanol water mixtures at 308 15 313 15 318 15 and 323 15 k
Physics and Chemistry of Liquids, 2008Co-Authors: Purushottam Haldar, Bijan DasAbstract:The electrical conductances of the solutions of tetrabutylammonium bromide (Bu4NBr), and tetrapentylammonium bromide (Pen4NBr) in 2-Ethoxyethanol (1) + water (2) mixed solvent media containing 0.25, 50 and 0.75 mass fractions of 2-Ethoxyethanol (w 1) have been reported at 308.15, 313.15, 318.15 and 323.15 K. The conductance data have been analyzed by the 1978 Fuoss conductance–concentration equation in terms of the limiting molar conductance (Λ0), the association constant (K A) and the association diameter (R). These two electrolytes are found to exist essentially as free ions in the solvent mixtures with w 1 = 0.25 and 0.50 over the entire temperature range; however, slight ionic association was observed in the mixed solvent medium richest in 2-Ethoxyethanol. The electrostatic ion–solvent interaction is found to be very weak for the tetraalkylammonium ions in the aqueous 2-Ethoxyethanol mixtures investigated.
Purushottam Haldar - One of the best experts on this subject based on the ideXlab platform.
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viscosities of tetrabutylammonium bromide sodium tetraphenylborate and sodium bromide in 2 Ethoxyethanol water mixed solvent media at 308 15 313 15 318 15 and 323 15 k
Journal of Molecular Liquids, 2008Co-Authors: Purushottam Haldar, Bijan DasAbstract:Abstract The viscosities of the solutions of tetrabutylammonium bromide (Bu4NBr), sodium tetraphenylborate (NaBPh4), sodium bromide (NaBr) in 2-Ethoxyethanol + water mixed solvent media containing 0.25, 0.50 and 0.75 mass fractions of 2-Ethoxyethanol (w1) have been reported at 308.15, 313.15, 318.15, and 323.15 K. The viscosity data have been analyzed by the Jones–Dole equation for the associated electrolytes to evaluate the viscosity B-coefficients of the electrolytes. These data have also been analyzed by the transition-state treatment to obtain contribution of the solutes to the free energy of activation for viscous flow of the solution. The viscosity of the solvent is found to be greatly modified by the presence of the tetrabutylammonium, tetraaphenylborate and bromide ions; sodium ion, on the other hand, is not such efficient in modifying the viscosity of the media investigated. Moreover, these ions behave neither as structure-breaker nor as structure-maker and the formation of the transition-state is made less favorable in their presence in aqueous 2-Ethoxyethanol solutions.
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electrical conductances of tetrabutylammonium bromide and tetrapentylammonium bromide in 2 Ethoxyethanol water mixtures at 308 15 313 15 318 15 and 323 15 k
Physics and Chemistry of Liquids, 2008Co-Authors: Purushottam Haldar, Bijan DasAbstract:The electrical conductances of the solutions of tetrabutylammonium bromide (Bu4NBr), and tetrapentylammonium bromide (Pen4NBr) in 2-Ethoxyethanol (1) + water (2) mixed solvent media containing 0.25, 50 and 0.75 mass fractions of 2-Ethoxyethanol (w 1) have been reported at 308.15, 313.15, 318.15 and 323.15 K. The conductance data have been analyzed by the 1978 Fuoss conductance–concentration equation in terms of the limiting molar conductance (Λ0), the association constant (K A) and the association diameter (R). These two electrolytes are found to exist essentially as free ions in the solvent mixtures with w 1 = 0.25 and 0.50 over the entire temperature range; however, slight ionic association was observed in the mixed solvent medium richest in 2-Ethoxyethanol. The electrostatic ion–solvent interaction is found to be very weak for the tetraalkylammonium ions in the aqueous 2-Ethoxyethanol mixtures investigated.
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electrical conductances of sodium bromide and sodium tetraphenylborate in 2 Ethoxyethanol water mixtures at 308 15 313 15 318 15 and 323 15 k
Journal of Molecular Liquids, 2007Co-Authors: Purushottam Haldar, Bijan DasAbstract:Abstract The electrical conductances of the solutions of sodium bromide (NaBr) and sodium tetraphenylborate (NaBPh 4 ) in 2-Ethoxyethanol + water mixed solvent media containing 0.25, 0.50 and 0.75 mass fractions of 2-Ethoxyethanol ( w 1 ) have been reported at 308.15, 313.15, 318.15, and 323.15 K. The conductance data have been analyzed by the 1978 Fuoss conductance–concentration equation in terms of the limiting molar conductance ( Λ 0 ), the association constant ( K A ) and the association diameter ( R ). Of the two electrolytes investigated here, sodium bromide exists essentially in the form of free ions in aqueous 2-Ethoxyethanol solutions over the entire temperature range investigated. However, slight ionic association was observed for sodium tetraphenylborate—the extent of which increases with increasing amount of 2-Ethoxyethanol in the present mixed solvent media. The solvations of the bromide ion and of the sodium ion were found to be gradually weakened as the 2-Ethoxyethanol content of the medium increases. Furthermore, the limiting molar conductivity values of the two electrolytes increase as the temperature increases in all 2-Ethoxyethanol + water mixtures which have been described by polynomial equations.
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electrical conductances of tetraethylammonium bromide and tetrapropylammonium bromide in 2 Ethoxyethanol 1 water 2 mixtures at 308 15 313 15 318 15 and 323 15 k
Journal of Chemical & Engineering Data, 2005Co-Authors: Purushottam HaldarAbstract:The electrical conductances of the solutions of tetraethylammonium bromide (Et4NBr) and tetrapropylammonium bromide (Pr 4 NBr) in 2-Ethoxyethanol (1) + water (2) mixed solvent media containing 0.25, 50, and 0.75 mass fractions of 2-Ethoxyethanol (ω 1 ) have been reported at (308.15, 313.15, 318.15, and 323.15) K. The conductance data have been analyzed by the 1978 Fuoss conductance-concentration equation in terms of the limiting molar conductance (A°), the association constant (K A ), and the association diameter (R). These two electrolytes are found to exist essentially as free ions in the solvent mixtures with ω 1 = 0.25 and 50 over the entire temperature range; however, slight ionic association was observed in the mixed solvent medium richest in 2-Ethoxyethanol. The electrostatic ion-solvent interaction is found to be very weak for the tetraalkylammonium ions in the aqueous 2-Ethoxyethanol mixtures investigated.
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Viscosities of some tetraalkylammonium bromides in 2-Ethoxyethanol at 308.15, 313.15, 318.15, and 323.15 K
Canadian Journal of Chemistry, 2005Co-Authors: Purushottam HaldarAbstract:The viscosities of the solutions of tetraethylammonium bromide (Et4NBr), tetrapropylammonium bromide (Pr4NBr), tetrabutylammonium bromide (Bu4NBr), tetrapentylammonium bromide (Pen4NBr), and tetraheptylammonium bromide (Hep4NBr) in 2-Ethoxyethanol have been reported at 308.15, 313.15, 318.15, and 323.15 K. The viscosity data have been analyzed by the JonesDole equation for the associated electrolytes to evaluate the viscosity B coefficients of the electrolytes. These data have also been analyzed by the transition-state treatment to obtain the contribution of the solutes to the free energy of activation for viscous flow of the solution. The viscosity of the solvent is found to be greatly modified by the presence of all of the tetraalkylammonium ions investigated. Moreover, the tetraalkylammonium ions are found to be unsolvated in 2-Ethoxyethanol solutions, they behave neither as structure-breaker nor as structure-maker and the formation of the transition state is made less favorable in their presence.Key ...
Wojciech J. Kinart - One of the best experts on this subject based on the ideXlab platform.
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density and relative permittivity of pyridine 2 mEthoxyethanol 2 Ethoxyethanol 2 propoxyethanol and 2 butoxyethanol binary mixtures at 298 15 k
Physics and Chemistry of Liquids, 2014Co-Authors: Cezary M. Kinart, Wojciech J. Kinart, Aneta Cwiklinska, Zdzisław KinartAbstract:The densities and relative permittivities of binary mixtures of pyridine with 2-mEthoxyethanol, 2-Ethoxyethanol, 2-propoxyethanol and 2-butoxyethanol have been measured as a function of composition, at T = 298.15 K. From the experimental data the excess molar volume (VE) and the deviation in the relative permittivity (Δe) from a mole fraction average have been calculated. The results are discussed in terms of intermolecular interactions and structure of studied binary mixtures.
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Density and relative permittivity of (pyridine + 2-mEthoxyethanol, 2-Ethoxyethanol, 2-propoxyethanol, and 2-butoxyethanol) binary mixtures at 298.15 K
2014Co-Authors: Cezary M. Kinart, Wojciech J. Kinart, Aneta Ćwiklińska, Zdzisław KinartAbstract:The densities and relative permittivities of binary mixtures of pyridine with 2-mEthoxyethanol, 2-Ethoxyethanol, 2-propoxyethanol and 2-butoxyethanol have been measured as a function of composition, at T = 298.15 K. From the experimental data the excess molar volume (VE) and the deviation in the relative permittivity (Δε) from a mole fraction average have been calculated. The results are discussed in terms of intermolecular interactions and structure of studied binary mixtures.
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volumetric and dielectric characterization and analysis of internal structure of binary mixtures of 2 Ethoxyethanol with ethylene glycol diethylene glycol triethylene glycol and tetraethylene glycol at t 293 15 298 15 and 303 15 k
Journal of Molecular Liquids, 2009Co-Authors: Cezary M. Kinart, Magdalena Klimczak, Wojciech J. KinartAbstract:Abstract Densities and relative permittivities, at T = (293.15, 298.15 and 303.15) K, in the binary mixtures of 2-Ethoxyethanol with ethylene glycol, diethylene glycol, triethylene glycol and tetraethylene glycol have been measured as a function of composition. From the experimental data the excess molar volumes and deviations in the relative permittivity have been calculated. The results are discussed in terms of intermolecular interactions and structural properties of studied binary mixtures.
Cezary M. Kinart - One of the best experts on this subject based on the ideXlab platform.
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density and relative permittivity of pyridine 2 mEthoxyethanol 2 Ethoxyethanol 2 propoxyethanol and 2 butoxyethanol binary mixtures at 298 15 k
Physics and Chemistry of Liquids, 2014Co-Authors: Cezary M. Kinart, Wojciech J. Kinart, Aneta Cwiklinska, Zdzisław KinartAbstract:The densities and relative permittivities of binary mixtures of pyridine with 2-mEthoxyethanol, 2-Ethoxyethanol, 2-propoxyethanol and 2-butoxyethanol have been measured as a function of composition, at T = 298.15 K. From the experimental data the excess molar volume (VE) and the deviation in the relative permittivity (Δe) from a mole fraction average have been calculated. The results are discussed in terms of intermolecular interactions and structure of studied binary mixtures.
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Density and relative permittivity of (pyridine + 2-mEthoxyethanol, 2-Ethoxyethanol, 2-propoxyethanol, and 2-butoxyethanol) binary mixtures at 298.15 K
2014Co-Authors: Cezary M. Kinart, Wojciech J. Kinart, Aneta Ćwiklińska, Zdzisław KinartAbstract:The densities and relative permittivities of binary mixtures of pyridine with 2-mEthoxyethanol, 2-Ethoxyethanol, 2-propoxyethanol and 2-butoxyethanol have been measured as a function of composition, at T = 298.15 K. From the experimental data the excess molar volume (VE) and the deviation in the relative permittivity (Δε) from a mole fraction average have been calculated. The results are discussed in terms of intermolecular interactions and structure of studied binary mixtures.
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volumetric and dielectric characterization and analysis of internal structure of binary mixtures of 2 Ethoxyethanol with ethylene glycol diethylene glycol triethylene glycol and tetraethylene glycol at t 293 15 298 15 and 303 15 k
Journal of Molecular Liquids, 2009Co-Authors: Cezary M. Kinart, Magdalena Klimczak, Wojciech J. KinartAbstract:Abstract Densities and relative permittivities, at T = (293.15, 298.15 and 303.15) K, in the binary mixtures of 2-Ethoxyethanol with ethylene glycol, diethylene glycol, triethylene glycol and tetraethylene glycol have been measured as a function of composition. From the experimental data the excess molar volumes and deviations in the relative permittivity have been calculated. The results are discussed in terms of intermolecular interactions and structural properties of studied binary mixtures.
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Viscosity of binary mixtures of 2-Ethoxyethanol with ethylene glycol, diethylene glycol, triethylene glycol and tetraethylene glycol systems at T = (293.15, 298.15 and 303.15) K
Physics and Chemistry of Liquids, 2009Co-Authors: Cezary M. Kinart, Magdalena Klimczak, Marta MajAbstract:Viscosities, at T = 293.15, 298.15 and 303.15 K, in the binary mixtures of 2-Ethoxyethanol with ethylene glycol, diethylene glycol, triethylene glycol and tetraethylene glycol have been measured as a function of composition. From the experimental data the deviations in the viscosity have been calculated. The viscosity data, at T = 298.15 K, were correlated with equations of Hind et al., Grunberg and Nissan, and Frenkel. The results are discussed in terms of intermolecular interactions and structural properties of studied binary mixtures.
Sudhir P Dabke - One of the best experts on this subject based on the ideXlab platform.
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isobaric vapor liquid equilibrium data of binary systems containing 2 Ethoxyethanol 2 ethoxyethyl acetate and toluene
Journal of Chemical & Engineering Data, 2020Co-Authors: Vyomesh M Parsana, Sudhir P Dabke, Urvi Parekh, Keval Ziniya, Kedar Joshi, Thijs J H Vlugt, Mahinder RamdinAbstract:Isobaric vapor–liquid equilibrium data of the binary systems comprising 2-Ethoxyethanol, 2-ethoxyethyl acetate, and toluene were measured using an ebulliometer. The boiling temperatures of the bina...
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vapor liquid equilibrium for the 2 Ethoxyethanol 2 ethoxyethyl acetate system
Journal of Chemical & Engineering Data, 2012Co-Authors: Bhumika K Rana, Nitin V Bhate, Sanjay M Mahajani, Sudhir P DabkeAbstract:Isobaric vapor–liquid equilibrium data for pure components as well as binary mixtures of 2-Ethoxyethanol–2-ethoxyethyl acetate was generated using a modified ebulliometer. Measurements are reported...
