Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

ABSTRACT

Densities, q, ultrasonic speeds, u, and viscosities, g of aqueous-D-mannose (2.5% and 5% of D-mannose, w/w in water) and of solutions of glycine, L-alanine, L-valine and L-isoleucine in aqueous-D-mannose solvents were measured at temperatures (293.15, 298.15, 303.15, 308.15, 313.15 and 318.15) K and at atmospheric pressure. These experimental values have been used to calculate the apparent molar volume, V/, limiting apparent molar volume, V / and the slope, Sv, apparent molar compressibility, Ks;/, limiting apparent molar compressibility, K s;/ and the slope, Sk, transfer limiting apparent molar volume, V /;tr , transfer limiting apparent molar compressibility, K s;/;tr , hydration number, nH, Falkenhagen coefficient, A, Jones Dole coefficient, B, and temperature derivative of B-coefficient, dB/dT. The Gibbs free energies of activation of viscous flow per mole of solvent, Dl 1 and per mole of solute, Dl 2 were also calculated. The results are interpreted in terms of solute solvent and solute solute interactions in these systems. The structure-making/breaking ability of the amino acids has also been discussed in terms of the sign of dB/dT. Furthermore, the values of V /, K s;/, V /;tr , K s;/;tr , B and Dl 2 have been split into groups contributions of the amino acids using linear correlation with number of carbon atoms in the alkyl chain of the amino acids.