Journal of Pure and Applied Ultrasonics

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Excess Thermodynamic Fluctuation Parameters of Binary Mixtures of Acetonitrile, Benzene and Dimethyl-Formamide at 298.15 K


Affiliations
1 Department of Physics, University of Botswana, Gaborone, Botswana
2 Department of Physics, Sri Krishnadevaraya University, Anantapur-515003, India
 

The parameters characterizing thermodynamic fluctuations namely mean square fluctuations of pressure <(ΔP)2>, temperature <(ΔT)2>, number of molecules in a given volume < (ΔN/N)2> and the correlation function of pressure and temperature fluctuations <(ΔP)(ΔT)> in the binary mixtures of CH3CN + C6H6, C6H6 + HCON(CH3)2 and CH3CN + HCON(CH3)2 at 298.15 K have been evaluated using the data on ultrasonic velocity, density, molar heat capacity at constant pressure and thermal expansion coefficient. The corresponding excess functions have been evaluated considering that the ideal values are additive on mole fraction basis. The variations of <(ΔP)2>E, <(ΔT)2>E, < (ΔN/N) >E and <(ΔP)(ΔT)>E with the mole fraction of the first component are found to exhibit extrema at intermediate concentrations. The residts are explained in the light of modification of the structure of pure liquids as a result of mixing with the other and stability of the structure formed in the mixtures against the various thermodynamic fluctuations present in the liquid state.
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  • Excess Thermodynamic Fluctuation Parameters of Binary Mixtures of Acetonitrile, Benzene and Dimethyl-Formamide at 298.15 K

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Authors

T. Ramanjappa
Department of Physics, University of Botswana, Gaborone, Botswana
E. Rajagopal
Department of Physics, Sri Krishnadevaraya University, Anantapur-515003, India
N. Manohara Murthy
Department of Physics, Sri Krishnadevaraya University, Anantapur-515003, India

Abstract


The parameters characterizing thermodynamic fluctuations namely mean square fluctuations of pressure <(ΔP)2>, temperature <(ΔT)2>, number of molecules in a given volume < (ΔN/N)2> and the correlation function of pressure and temperature fluctuations <(ΔP)(ΔT)> in the binary mixtures of CH3CN + C6H6, C6H6 + HCON(CH3)2 and CH3CN + HCON(CH3)2 at 298.15 K have been evaluated using the data on ultrasonic velocity, density, molar heat capacity at constant pressure and thermal expansion coefficient. The corresponding excess functions have been evaluated considering that the ideal values are additive on mole fraction basis. The variations of <(ΔP)2>E, <(ΔT)2>E, < (ΔN/N) >E and <(ΔP)(ΔT)>E with the mole fraction of the first component are found to exhibit extrema at intermediate concentrations. The residts are explained in the light of modification of the structure of pure liquids as a result of mixing with the other and stability of the structure formed in the mixtures against the various thermodynamic fluctuations present in the liquid state.