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Paper Details

Molecular Interaction Study of Lactose, DMF-H2O and NaCl System Using Acoustic, Viscometric and Volumetric Methods at different Temperatures

Rita Mehra* and Brij Bihari Malav

Journal Title:Journal of Chemical, Biological and physical sciences
Abstract


Acoustic, viscometric and volumetric studies are useful for characterization of molecular interactions and to understand the effect of temperature of lactose in mixed solvent of N,Ndimethylformamide (DMF)-H2O+NaCl. Physical properties viz density (r), viscosity (?), sound speed (u) and refractive index (nD) at varying concentrations from 0.0105-0.1045 m at 298, 308 and 318 K have been determined using precalibrated bicapillary pycnometer, Ostwalds viscometer, Abbes refractometer and single frequency ultrasonic interferometer at 2 MHz frequency respectively. The derived parameters like adiabatic compressibility (?), acoustic impedance (Z), absorption coefficient (?/f2), apparent molal volume (fv), apparent molal compressibility (fK), free volume (Vf), intermolecular free length (Lf), acoustical relaxation time (t ), Gibbs free energy (?G), internal pressure (?i), Raos constant (Rm), Wadas constant (W) and molar refractivity (RD) have been determined from experimental data. All the measurements have been carried out in a thermostatically controlled water bath with circulating medium having accuracy of 0.1C

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