Measurement of Ternary Mutual Diffusion Coefficients from Ill-Conditioned Taylor Dispersion Profiles in Cases of Identical or Nearly Identical Eigenvalues of the Diffusion Coefficient Matrix†

2010 ◽  
Vol 55 (5) ◽  
pp. 1814-1820 ◽  
Author(s):  
Gargi Basu Ray ◽  
Derek G. Leaist
Keyword(s):  
Diffusion Coefficient ◽  
Diffusion Coefficients ◽  
Coefficient Matrix ◽  
Taylor Dispersion ◽  
Mutual Diffusion

Mutual Diffusion Coefficients for the Systems HD–N2 and HD–Ar at 1 atm Pressure and 300 K

1973 ◽  
Vol 51 (19) ◽  
pp. 2101-2107 ◽  
Author(s):  
K. R. Harris ◽  
T. N. Bell
Keyword(s):  
Diffusion Coefficient ◽  
Diffusion Coefficients ◽  
Experimental Error ◽  
Mutual Diffusion ◽  
Intermolecular Potentials ◽  
Mass Effects

Mutual diffusion coefficients, D12, have been measured as a function of concentration for the systems HD–N2 and HD–Ar at 1 atm pressure and 300 K. The data are compared with previously published measurements for the corresponding H2 and D2 containing systems. After the estimated uncertainties due to experimental error and impurities, and corrections due to quantum and mass effects are taken into account, the mass corrected diffusion coefficient, [Formula: see text], for each system is found to lie above those of the corresponding H2 and D2 systems by up to 2%. These effects are attributed to differences in the intermolecular potentials of H2, D2, and HD.

Diffusion Coefficients of Aqueous Solutions of Carbohydrates as Seen by Taylor Dispersion Technique at Physiological Temperature (37 °C)

2006 ◽  
Vol 258-260 ◽  
pp. 305-309 ◽  
Author(s):  
Ana C.F. Ribeiro ◽  
Cecilia Isabel A.V Santos ◽  
Victor M.M. Lobo ◽  
Artur J.M. Valente ◽  
Pedro M.R.A. Prazeres ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Concentration Dependence ◽  
Diffusion Coefficients ◽  
Taylor Dispersion ◽  
Mutual Diffusion ◽  
Physiological Temperature ◽  
Taylor Dispersion Technique ◽  
Dispersion Technique

Binary mutual diffusion coefficients have been measured for aqueous solutions of some carbohydrates (glucose, fructose, lactose, sucrose, α-cyclodextrin and β- cyclodextrin) at concentrations from 0.002 mol dm-3 to 0.010 mol dm-3. The concentration dependence of the diffusion coefficients at physiological temperature, 37 °C, is discussed on the basis of their structures.

Ternary mutual diffusion coefficients of MgCl2 + MgSO4 + H2O and Na2SO4 + MgSO4 + H2O from Taylor dispersion profiles

1991 ◽  
Vol 69 (10) ◽  
pp. 1548-1553 ◽  
Author(s):  
Zhipeng Deng ◽  
Derek G. Leaist
Keyword(s):  
Diffusion Coefficients ◽  
Multicomponent Diffusion ◽  
Taylor Dispersion ◽  
Mutual Diffusion ◽  
Salt Solutions ◽  
Mixed Salt ◽  
Ternary Diffusion ◽  
Peak Broadening ◽  
Ternary Diffusion Coefficients ◽  
Mixed Salt Solutions

The Taylor dispersion (peak-broadening) technique is used to measure the ternary mutual diffusion coefficients of the mixed salt solutions MgCl2 + MgSO4 + H2O and Na2SO4 + MgSO4 + H2O at 25 °C. The dispersion of the solutes is followed by differential refractometry. A simple least-squares procedure is developed to calculate the ternary diffusion coefficients from the refractive index profiles. The coefficients are measured at 0.04, 0.20, or 0.40 mol dm−3 total salt for the molar salt ratios 1:3, 1:1, or 3:1. The measured diffusion coefficients are compared with the limiting values for the completely dissociated salts. Key words: mixed salt solutions, multicomponent diffusion, Taylor dispersion, ternary diffusion coefficients.

The mutual diffusion coefficient of ethanol–water mixtures: determination by a rapid, new method

1974 ◽  
Vol 336 (1606) ◽  
pp. 393-406 ◽  
Keyword(s):  
Experimental Data ◽  
Diffusion Coefficient ◽  
Laminar Flow ◽  
Diffusion Coefficients ◽  
Entire Range ◽  
Liquid Mixtures ◽  
Mutual Diffusion ◽  
Mutual Diffusion Coefficient ◽  
Mechanical Theory ◽  
Statistical Mechanical

Mutual diffusion coefficients for liquid mixtures of ethanol and water have been measured over the entire range of composition and for temperatures from 25 to 65 °C at a pressure of 1 bar (10 5 Pa). At the lowest temperature, the results establish the validity of a new experimental method based upon Taylor’s analysis of solute dispersion in laminar flow. The method offers advantages of simplicity and speed over other techniques, and allows direct measurement of diffusion coefficients at well-defined mixture compositions. The experimental data have an estimated uncertainty of ±2.5% . The results have been utilized to evaluate friction coefficients arising in the statistical mechanical theory of transport in liquid mixtures.

scholarly journals Dependence of Viscosity and Diffusion on β-Cyclodextrin and Chloroquine Diphosphate Interactions

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1433
Author(s):  
Lenka Musilová ◽  
Aleš Mráček ◽  
Eduarda F. G. Azevedo ◽  
M. Melia Rodrigo ◽  
Artur J. M. Valente ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Diffusion Coefficients ◽  
Mutual Diffusion ◽  
Binary Diffusion Coefficient ◽  
Concentration Gradients ◽  
Cross Diffusion ◽  
Taylor Dispersion Technique ◽  
Dispersion Technique ◽  
And Diffusion ◽  
Chloroquine Diphosphate

Mutual diffusion coefficients of chloroquine diphosphate (CDP) in aqueous solutions both without and with β-cyclodextrin (β-CD) were measured at concentrations from (0.0000 to 0.0100) mol dm−3 and 298.15 K, using the Taylor dispersion technique. Ternary mutual diffusion coefficients (Dik) measured by the same technique are reported for aqueous CDP + β-CD solutions at 298.15 K. The presence of β CD led to relevant changes in the diffusion process, as showed by nonzero values of the cross-diffusion coefficients, D12 and D21. β-CD concentration gradients produced significant co-current coupled flows of CDP. In addition, the effects of β-CD on the transport of CDP are assessed by comparing the binary diffusion coefficient of aqueous CDP solutions with the main diffusion coefficient (D11) measured for ternary {CDP(1) + β-CD(2)} solutions. These observations are supported by viscosity analysis. All data allow to have a better interpretation on the effect of cyclodextrin on the transport behavior of CDP.

Molecular dynamics study of diffusion of krypton in water at different temperatures

2016 ◽  
Vol 30 (11) ◽  
pp. 1650064 ◽  
Author(s):  
Dipendra Bhandari ◽  
N. P. Adhikari
Keyword(s):  
Molecular Dynamics ◽  
Diffusion Coefficient ◽  
Diffusion Coefficients ◽  
Mean Square Displacement ◽  
Mutual Diffusion ◽  
Arrhenius Behavior ◽  
Self Diffusion ◽  
Velocity Autocorrelation ◽  
Different Temperatures ◽  
Self Diffusion Coefficient

Molecular dynamics study of diffusion of two krypton atoms in 300 SPC/E water molecules at temperatures 293, 303, 313, 323 and 333 K has been carried out. Self-diffusion coefficient of krypton and water along with their mutual diffusion coefficients are estimated. Self-diffusion coefficient for krypton is calculated by using Mean Square Displacement (MSD) method and Velocity Autocorrelation (VACF) method, while that for water is calculated by using MSD method only. The mutual diffusion coefficient is estimated by using the Darken’s relation. The diffusion coefficients are found to follow the Arrhenius behavior. The structural properties of the system have been estimated by the study of solute–solute, solvent–solvent, and solute–solvent Radial Distribution Function (RDF).

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