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Diffusion of levodopa in aqueous solutions of hydrochloric acid at 25 °C
Barros, Marisa C. F.; Ribeiro, Ana C. F.; Esteso, Miguel A.; Lobo, Victor M. M.; Leaist, Derek G.Ternary mutual diffusion coefficients (D11, D22, D12 and D21) measured by the Taylor dispersion method are reported for aqueous solutions of {levodopa (l-dopa) + HCl} solutions at 25 °C and HCl concentrations up to 0.100 mol · dm−3. The coupled diffusion of l-dopa (1) and HCl (2) is significant, as indicated by large negative cross-diffusion coefficients. D21, for example, reaches values that are larger than D1...
Interaction between lactose and cadmium chloride in aqueous solutions as seen b...
Verissimo, Luis M. P.; Gomes, Joselaine C. S.; Romero, Carmen; Esteso, Miguel A.; Sobral, Abilio J. F. N.; Ribeiro, Ana C. F.Diffusion coefficients of an aqueous system containing cadmium chloride 0.100 mol · dm−3 and lactose at different concentrations at 25 °C have been measured, using a conductimetric cell and an automatic apparatus to follow diffusion. The cell relies on an open-ended capillary method and a conductimetric technique is used to follow the diffusion process by measuring the resistance of a solution inside the capill...
Binary Mutual Diffusion Coefficients of Isoniazid Aqueous Solutions at (298.15 ...
Ribeiro, Ana C. F.; Santos, Ana C. G.; Lobo, Victor M. M.; Veiga, Francisco J. B.; Cabral, Ana M. T. D. P. V.; Esteso, Miguel A.; Ortona, OrnellaBinary mutual diffusion coefficients measured by the Taylor dispersion method in two different laboratories (University of Naples, Federico II, Italy, and University of Coimbra, Portugal) are reported for aqueous solutions of isoniazid at concentrations from (0.000 to 0.100) mol·dm−3 and at two temperatures (298.15 and 310.15) K. The hydrodynamic radii for the isoniazid in aqueous solution are calculated from t...
Mean distance of closest approach of ions: Lithium salts in aqueous solutions
Ribeiro, Ana C. F.; Lobo, Victor M. M.; Burrows, Hugh D.; Valente, Artur J. M.; Amado, Ana M.; Sobral, Abílio J. F. N.; Teles, Ana S. N.Numerical values for the mean distance of closest approach of ions, "a", for lithium salts in aqueous solutions are presented and discussed. These values were obtained from both experimental activity and diffusion coefficients, and estimated by using different theoretical approaches. ; http://www.sciencedirect.com/science/article/B6TGR-4RR1NKM-1/1/b8d3cdac33991c5424d567940bc0c3a6
Some Transport Properties of γ-Cyclodextrin Aqueous Solutions at (298.15 and 31...
Ribeiro, Ana C. F.; Santos, Cecília I. A. V.; Valente, Artur J. M.; Ascenso, Osvaldo S.; Lobo, Victor M. M.; Burrows, H. D.; Cabral, Ana M. T. D. P. V.Values of binary mutual diffusion (interdiffusion) coefficients, obtained by using the Taylor dispersion method, for aqueous solutions of γ-cyclodextrin in the concentration range from (0.002 to 0.010) mol·dm−3 and temperatures (298.15 and 310.15) K are reported. From these experimental results, the hydrodynamic radius values for the γ-cyclodextrin are estimated. Also, the measured diffusion coefficients are us...
Mean distance of closest approach of ions: Sodium salts in aqueous solutions
Ribeiro, Ana C. F.; Esteso, Miguel A.; Lobo, Victor M. M.; Burrows, Hugh D.; Amado, Ana M.; Costa, António M. Amorim da; Sobral, Abílio J. F. N.The estimation of numerical values for the mean distance of closest approach of ions, a, of sodium salts in aqueous solutions, determined from activity and diffusion coefficients, and also from different theoretical approaches, is presented and discussed. ; http://www.sciencedirect.com/science/article/B6TGR-4JCCFW7-1/1/45bf32523013b068b5040514add5505a
Diffusion Coefficients of Copper Chloride in Aqueous Solutions at 298.15 K and ...
Ribeiro, Ana C. F.; Esteso, Miguel A.; Lobo, Victor M. M.; Valente, Artur J. M.; Simões, Susana M. N.; Sobral, Abilio J. F. N.; Burrows, Hugh D.Mutual diffusion coefficients (interdiffusion coefficients) and molar conductivities have been measured for copper(II) chloride in water at 298.15 K and 310.15 K at concentrations between 0.005 mol·dm-3 and 0.05 mol·dm-3. The diffusion coefficients were measured using a conductometric cell. The experimental data are discussed on the basis of the Onsager−Fuoss model. The Nernst diffusion coefficients derived fro...
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