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Water sorption density distribution function

A spatial dispersion in the distribution of wall charges is accounted for by introducing a density distribution function n ((Tq), defined as the number of pores per infinitesimal interval of gq. Knowledge of n (ao) is a prerequisite for predicting the water sorption behavior of a PEM. The following integral expressions relate n (ao) to the number of unit cells Nuc in a sample of total dry volume Vo ... [Pg.112]

A necessary consistency check of a water sorption model is the calculation of vapor sorption isotherms. Equation 2.49 gives A V/Vb as a function of oo.c- The input for the calculation includes the environmental parameters T, P, P"), materials parameters (sr, G, PsQ-) probability density distribution n (ao). The value of t]c can be... [Pg.116]

Chapter 2 dwells on all aspects of the structure and functioning of polymer electrolyte membranes. The detailed treatment is limited to water-based proton conductors, as, arguably, water is nature s favorite medium for the purpose. A central concept in this chapter is the spontaneous formation of ionomer bundles. It is a linchpin between polymer physics, macromolecular self-assembly, phase separation, elasticity of ionomer walls, water sorption behavior, proton density distribution, coupled transport of protons and water, and membrane performance. [Pg.559]

Figure 2. Distribution of DNOC (open symbols), and TNT (filled symbols) between aqueous and solid phases of typical aquifer and soil materials. Shown is the fraction of sorbed species as a function of pH and K" -saturation of the clay minerals. The relative importance of the two dominating sorption mechanisms are compared hydrophobic partitioning into sediment organic matter (O, ) and specific EDA-complex formation with clay mineral surfaces (O, ) triangles (A, A) represent the overall speciation for DNOC and TNT respectively. Sediment parameters were chosen as follows fraction of organic carbon 4. (soil) = 0.05 f (aquifer) = 0.001 fraction of clay minerals f igy (soil) = 0.35 fciay (aquifer) = 0.05 porosity e(soil) = 0.4 (aquifer) = 0.3 bulk density p(soil) = p(aquifer) = 2.5 kg L water saturation 0(soil) = 0.5 0(aquifer) = 1 fraction of K -saturation of clay minerals = 0.001 (when pH was used as system variable) pH = 7.0 (when f(, +, was used as system variable). Linear adsorption isotherms of TNT and... [Pg.207]


See other pages where Water sorption density distribution function is mentioned: [Pg.31]    [Pg.344]    [Pg.542]    [Pg.417]    [Pg.353]   
See also in sourсe #XX -- [ Pg.112 ]




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