Comparison of diffusion coefficient

TABLE I A Comparison of Diffusion Coefficients and Their Variations... 

Figure 4 Comparison of diffusion coefficient data obtained by CV (+), RDV (Af and QELS (O)-The microemulsion comprised CTAB 2 wt Mi, butanol (4 wt Mi), aqueous NaBr (2 wt%) solution, and octane. (From Ref. 51.)...

FIGURE 7.1.21 Comparison of diffusion coefficients derived from the creep data and cation diffusion experiments. 

T. Chang, C. C. Han, L. M. Wheeler, and T. P. Lodge. Comparison of diffusion coefficients in ternary polymer solutions measured by dynamic light scattering and forced Rayleigh scattering. Macromolecules, 21 (1988), 1870-1872. 

Comparison of diffusion coefficients for Kr and Cs in test VI-5 vs temperature with values calculated by the ORNL Diffusion Release Model. 

Fig. 4.18 Comparison of diffusion coefficient in LSGM estimated from ionic conductivity and tracer diffusion measurements and calculated by molecular dynamic calculations...

The boundary conditions imposed are a zero flux condition at the outermost surface of the solder and a Dirichlet zero condition at the interface solder/metallization (Au sink). The diffusion coefficient for Au in Sn-Pb was determined by other investigators for several annealing temperatures. Comparison of diffusion coefficients of Au in Sn-Pb to those of Au in single crystal Sn (a... 

Table 5.7-1 A comparison of diffusion coefficients and their variations...

In dense membranes, no pore space is available for diffusion. Transport in these membranes is achieved by the solution diffusion mechanism. Gases are to a certain extent soluble in the membrane matrix and dissolve. Due to a concentration gradient the dissolved species diffuses through the matrix. Due to differences in solubility and diffusivity of gases in the membrane, separation occurs. The selectivities of these separations can be very high, but the permeability is typically quite low, in comparison to that in porous membranes, primarily due to the low values of diffusion coefficients in the solid membrane phase. 

Fig. 8.4 Chemical diffusion coefficient as a function of temperature for various predominantly electronically conducting materials. For comparison the diffusion coefficients of Cu in liquid Cu and of O2 in air are shown.

Debye—Smolucholowski rate coefficient does indicate that these reaction rates are in broad agreement (see Table 2). If it is accepted that some hydrodynamic repulsion occurs, less than implied by the Deutch and Felderhof analysis [70], but as suggested by Wolynes and Deutch [71], then the reaction radii are as listed in Table 2. However, if allowance is also made for the larger size of some reactants than the hydrated electron, then the agreement between experiment and theory becomes satisfactory. Nevertheless, the uncertainty of diffusion coefficients and the crystallographic or true reaction radii, R, let alone the rate of reaction of encounter pairs, makes a comparison of these relatively small effects difficult. 

TABLE II Comparison Aqueous Solution and in of Diffusion Coefficients Nafion Film (cm /s) in Homogeneous... 

A comparison of the coefficient of variation between the screw-type cells described by Bronaugh (3) and the modified spring clamped cells shows that there does appear to be a slight reduction in variability using the spring clamped diffusion cell. However, there is no statistical difference between the two types of diffusion cells (p>0.5). 

A comparison of predicted and measured values of diffusion coefficients for solutes with a large range of molecular weights in polyolefins is shown in Chapter 15 and allows an empirical selection of the a-value. 

Table 11.2 Comparison of predicted efficiencies of photosynthesis with measured values at various values of diffusion coefficients...

By inspection of Eqs. (87)-(89) it is seen that measurement of the rotating disk current may provide information concerning the value of n, C%, Da, vy., or ks,f if the remaining parameters are known. Accuracy in determination of n values depends mainly on how accurately the value of Da for the compound in question is known. For the majority of organic compounds, diffusion coefficients in the common organic solvents have not been measured, but comparison with a suitable compound of similar structure for which both n and D are known can often solve the problem (assuming the same value of D for the two substrates). Since Da appears only to the power of in Eq. (88), the resulting n value is only moderately dependent on variations in the Da estimate. The measurement of diffusion coefficients by means of the RDE technique has been the subject of a number of papers [248,253] and need not be treated further at this place. 

Direct observation of the AFGP in solution by quasi-elastic light scattering also did not show any conformational changes that could be related to function (Ahmed et al., 1975). Comparisons of measurements of diffusion coefficients, at different temperatures and at... 

For comparison, the diffusion coefficients were calculated from each adsorption rate curve at the point where the cumene uptake was half of its equilibrium value. The results are shown in Table II. 

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