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WALTER DE GRUYTER GMBH
DOI: 10.1524/zpch.2008.222.1.177
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Density, rho, viscosity, eta, and refractive index, n, of some disaccharides [D(+)-cellobiose, D(+)-lactose monohydrate, D(+)-maltose nionohydrate and sucrose] in water and in 0.49850 and 0.99705 mol kg(-1) aqueous solutions of sodium sulphate [Na2SO4] have been measured at four temperatures [288.15, 298.15, 308.15 and 318.15 K]. From these data, the apparent molar volumes, V,,, and viscosity-B-coefficients using Jones-Dole equation have been determined at different temperatures. The partial molar volumes of transfer, Delta V-t(2)0 at infinite dilution and B-coefficients of transfer, A,B, have been estimated for transfer of disaccharides from water to aqueous sodium sulphate solutions. Partial molar expansion coefficients, (partial derivative V-2(0)/partial derivative T)(P) and dB/dT coefficients have also been calculated. Gibbs free energy of activation of viscous flow has been calculated by using Feakin's transition-state theory for the studied systems. D(+)-Cellobiose has shown characteristically different hydration behaviour among the studied disaccharides. The signs and magnitude of Delta V-t(2)0 and Delta B-t parameters have been discussed in terms of various interactions occurring in these solutions.
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