• Amalendu Pal

      Articles written in Journal of Chemical Sciences

    • Excess molar volumes and viscosities of binary mixtures of 1,2-dimethoxyethane with chloroalkanes at 298·15 K

      Amalendu Pal Gurcharan Dass Sanjay Sharma

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      Excess molar volumes (VmE), viscosity deviations (Δlnη) and excess energies of activation for viscous flow (ΔG*E) are reported for non-electrolyte mixtures of 1,2-dimethoxyethane (monoglyme) and dichloromethane, trichloromethane, and tetrachloromethane at 298·15 K and at atmospheric pressure over the whole mole fraction range. The Prigogine-Flory-Patterson (PFP) model has been used to calculateVmE, and the results are compared with experimental data. The Bloomfield and Dewan model has been used to calculate viscosity coefficients, which are compared with experimental data for three mixtures. These results have been analysed in terms of dipole-dipole interactions between 1,2-dimethoxyethane and chloroalkanes. The magnitude of the strength of interaction decreases with the dipole character of the molecule.

    • Excess molar volumes and viscosities of binary mixtures of 1,2-diethoxyethane with chloroalkanes at 298.15 K

      Amalendu Pal Rakesh Kumar Bhardwaj

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      Excess molar volumes (VmE) and viscosities (η) of the binary mixtures of 1,2-diethoxyethane with di-, tri- and tetrachloromethane have been measured at 298-15 K and atmospheric pressure over the entire mole fraction range. The deviations in viscosities (δlnη) and excess energies of activation (δG*E) for viscous flow have been calculated from the experimental data. The Prigogine-Flory-Patterson (PFP) model has been used to calculateVmE, and the results have been compared with experimental data. The Bloomfield and Dewan model has been used to calculate viscosity coefficients and these have also been compared with experimental data for the three mixtures. The results have been discussed in terms of dipole-dipole interactions between 1,2-diethoxyethane and chloroalkanes and their magnitudes decreasing with the dipole character of the molecules. A short comparative study with results for mixtures with polyethers and chloroalkanes is also described.

    • Excess molar volumes and viscosities of binary mixtures of some polyethers with 1-propanol at 288·15, 298·15, and 308·15 K

      Amalendu Pal Anil Kumar

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      Excess molar volumes$$V_m^E $$ and viscosities (η) have been measured as a function of composition for binary liquid mixtures of 1-propanol, C3H7OH, with diethylene glycol diethyl ether(bis(2- ethoxyethyl)ether), C2H5(OC2H4)2OC2H5, and diethylene glycol dibutyl ether (bis(2-butoxyethyl)ether), C4H9(OC2H4)2OC4H9, at 288.15, 298.15, and 308.15 K and at atmospheric pressure. The excess volume results included the following mixing quantities at all range of concentrations and at equimolar concentrations: α, volume expansivity;$$(V_m^E /\partial T)p,$$, and$$(\partial H^E /\partial P)_T $$ at 298.15 K. The obtained results were then compared with the calculated values by using the Flory theory of liquid mixtures. The theory predicts the α values rather well, while the calculated values of$$(V_m^E /\partial T)p,$$ and$$(\partial H^E /\partial P)_T $$ show variation with alkyl chain length of the polyether. The results are discussed in terms of order or disorder creation. From the viscosity data, deviations in viscosity (Δη) have been calculated. These values are negative over the entire range of composition. The results for$$V_m^E $$, and Δη are discussed in terms of interaction between components

    • Volumetric studies of some amino acids in binary aqueous solutions of MgCl2·6H2O at 288·15, and 308·15 K

      Amalendu Pal Suresh Kumar

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      Densities (ρ) of glycine, L-alanine, and L-valine in aqueous solutions of MgCl2-6H2O (0.1-0.8 mol kg-1) have been measured at 288.15, and 308.15 K. Apparent molar volumes (Vφ), and limiting partial molar volumes (Vφ0) of each amino acid have been calculated. These data were combined with the earlier reportedVφ0 values of glycine, L-alanine, and L-valine in aqueous MgCl2·6H2O solutions at 298.15 K in order to describe the temperature dependence behaviour of partial molar quantities. Group contributions to partial molar volumes have been determined for the amino acids. The trends of transfer volumes (△Vφ0) have been interpreted in terms of solute-cosolute interactions on the basis of a cosphere overlap model. Pair and triplet interaction coefficients have also been calculated from transfer parameters.

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