Self-diffusion coefficient carbon dioxide

E. B Winn, The Temperature Dependence of the Self-Diffusion Coefficients of Argon, Neon, Nitrogen, Oxygen, Carbon Dioxide, and Methane, Phys. Rev., 80 1024,1950. 

Figure 3. Density p [22], viscosity 77 [26], and self-diffusion coefficient D [27] of pure carbon dioxide as a function of pressure p at 313 K (for Du at 323 K).

Care mustbe used in applying such arguments when estimating practical diffusion coefficients, however, since increases in infinite-dilution hmit can cause significant changes in the effective mobility of the penetrant. Moreover, the (9 In oa/9 In o>a) term can deviate from unity at weight fractions as small as 10-20%, as was indicated in the case of carbon dioxide and ethylene earher. In the case of o-xylene diffusion in polyethylene at 150°C, both the effects of plasticization and of the (9 In oa/9 In self-diffusion coefficient have been analyzed and are shown in Figure 13 (34). 

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