RandD Span Diagnostic Ltd

Sūrat, India

RandD Span Diagnostic Ltd

Sūrat, India
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Ijardar S.P.,Sardar Vallabhbhai National Institute of Technology, Surat | Malek N.I.,Sardar Vallabhbhai National Institute of Technology, Surat | Oswal S.L.,R and D Span Diagnostic Ltd.
Indian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry | Year: 2011

Apparent molar volumes (Vφ ,B ) of dilute solutions of triethylamine in heptane, 2-butanone, ethyl ethanoate, butyl ethanoate, 1,4-dimethylbenzene, ethylbenzene, chlorobenzene, and nitrobenzene, at 303.15 K have been calculated from the densities determined. The limiting partial molar volumes ( V̄B∞- ), limiting excess partial molar volumes (V̄B E,∞ V) and volumes of transference (ΔV̄B,tr ∞ ) from heptane to the other investigated solvents of varying polarity have been analysed in terms of solute-solute-solvent interactions and structural effects of the molecules. Using the Terasawa model, an attempt has been made to find a measure of the contribution of specific interactions in terms of void volumes of triethylamine in the investigated solvents over a range of polarity. The Flory theory/ERAS model has also been applied to estimate the apparent molar volumes, excess apparent molar volumes and limiting excess partial molar volumes of triethylamine in investigated systems.


Pandiyan V.,Annamalai University | Oswal S.L.,RandD Span Diagnostic Ltd | Malek N.I.,Sardar Vallabhbhai National Institute of Technology, Surat | Vasantharani P.,Annamalai University
Thermochimica Acta | Year: 2011

Densities ρ and speeds of sound u, of binary mixtures formed by 2-chloroaniline or 3-chloroaniline with diisopropyl ether or oxolane have been measured over the entire range of composition at a temperature of (303.15, 313.15 and 323.15 K) and atmospheric pressure. The ρ and u values were used to calculate isentropic compressibilities κS, Rao's molar sound functions R, intermolecular free lengths Lf, specific acoustic impedances Z, excess molar volumes VmE, excess isentropic compressibilities κSE, excess intermolecular free lengths LfE and excess specific acoustic impedances ZE. The results have been used to investigate molecular interactions and structural effects in these mixtures. The speed of sound in present mixtures has been estimated using several empirical and theoretical models to determine their relative predicting ability in terms of pure component properties. © 2011 Elsevier B.V.


Pandiyan V.,Annamalai University | Vasantharani P.,Annamalai University | Oswal S.L.,RandD Span Diagnostic Ltd | Kannappan A.N.,Annamalai University
Journal of Chemical and Engineering Data | Year: 2011

Densities, ρ, and speeds of sound, u, of binary mixtures formed by aniline or N-methylaniline or N-ethylaniline with diisopropyl ether (DIPE) have been measured over the entire range of composition at a temperature of (303.15, 313.15, and 323.15) K and atmospheric pressure. The ρ and u values were used to calculate isentropic compressibilities, κ S, excess molar volumes, Vm E, and excess isentropic compressibilities κS E. The results have been used to investigate molecular interactions and structural effects in these mixtures. The speed of sound u in present mixtures has been estimated using several theoretical models to determine their relative predicting ability in terms of pure component properties. The ERAS model is applied to study Vm E for DIPE-aniline and oxolane-aniline mixtures at (303.15, 313.15, and 323.15) K. The ERAS model represents qualitatively very large negative Vm E data. © 2011 American Chemical Society.


Pandiyan V.,Annamalai University | Oswal S.L.,RandD Span Diagnostic Ltd | Vasantharani P.,Annamalai University
Thermochimica Acta | Year: 2011

Densities ρ and speeds of sound u, of binary mixtures formed by N,N-dimethylaniline (DMA) or N,N-diethylaniline (DEA) with diisopropyl ether (DIPE) or oxolane have been measured over the entire range of composition at a temperature of (303.15, 313.15 and 323.15 K) and atmospheric pressure. The ρ and u values were used to calculate isentropic compressibilities κS, Rao's molar sound functions R, intermolecular free lengths Lf, specific acoustic impedances Z, excess molar volumes VmE, excess isentropic compressibilities κSE, excess intermolecular free lengths LfE and excess specific acoustic impedances ZE. The results have been used to investigate molecular interactions and structural effects in these mixtures. The speeds of sound in present mixtures have been estimated using several empirical and theoretical models to determine their relative predicting ability in terms of pure component properties. © 2011 Elsevier B.V.


Pandiyan V.,Annamalai University | Oswal S.L.,RandD Span Diagnostic Ltd | Vasantharani P.,Annamalai University
Thermochimica Acta | Year: 2011

Densities ρ and speeds of sound u, of binary mixtures formed by o-toluidine or m-toluidine with diisopropyl ether (DIPE) or oxolane have been measured over the entire range of composition at a temperature of (303.15, 313.15 and 323.15) K and atmospheric pressure. The ρ and u values were used to calculate isentropic compressibilities κS, Rao's molar sound functions R, intermolecular free lengths Lf, specific acoustic impedances Z, excess molar volumes VmE, excess isentropic compressibilities κSE, excess intermolecular free lengths LfE and excess specific acoustic impedances Z E. The results have been used to investigate molecular interactions and structural effects in these mixtures. The speed of sound in present mixtures has been estimated using several empirical and theoretical models to determine their relative predicting ability in terms of pure component properties. © 2011 Elsevier B.V. All rights reserved.


Oswal S.L.,RandD Span Diagnostic Ltd | Pandiyan V.,Annamalai University | Krishnakumar B.,Annamalai University | Vasantharani P.,Annamalai University
Thermochimica Acta | Year: 2010

Speeds of sound u, isentropic compressibilities κS, Rao's molar sound functions R, intermolecular free lengths Lf, specific acoustic impedances Z, excess molar volumes VmE, excess isentropic compressibilities κSE, excess intermolecular free lengths LfE and excess specific acoustic impedances ZE, of three binary mixtures of oxolane (tetrahydrofuran) with aniline, N-methylaniline and N-ethylaniline have been reported over the entire range of composition at 303.15, 313.15 and 323.15 K. The excess values have been fitted to Redlich-Kister polynomial equation. The results have been analyzed in terms of molecular interactions between oxolane and anilines. The speeds of sound in present binary mixtures have been estimated from various empirical and theoretical models. © 2010 Elsevier B.V.


Oswal S.,R. and D. Span Diagnostic Ltd
Journal of Chemical Research | Year: 2011

A. Ali and M. Tariq (J. Chem. Res., 30, 2006, 261) have reported the prediction of internal pressure of binary liquid mixtures using Flory's statistical theory. It is now shown that the Ali-Tariq approach to calculate thermal expansion coefficient αp and isothermal compressibility κT for both organic liquids and liquid mixtures, is totally wrong, misleading and introduces errors in thermodynamic data. It should also be emphasised that once the correct expressions for calculating Flory's interaction parameter X12 are known, one should use only those expressions to derive X12 in the prediction of any thermodynamic property of liquid mixtures.

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