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Thick Surface Charge Layer and Donnan Potential

3 Thick Surface Charge Layer and Donnan Potential [Pg.90]

Consider the case where the thickness of the surface layer d is much larger than the Debye length 1/k. In this case, the electric field (d J//dx) and its derivative (f j/ldx ) deep inside the surface layer become zero so that the potential deep inside the surface layer becomes the Donnan potential i/ don. given by Eq. (4.18). It must be noted here that this is the case only for d 1/k. If the condition d I/k does not hold, there is no region where the potential reaches the Donnan potential. When d 1/k, by replacing y —d) by Tdon in Eq. (4.35), we obtain [Pg.90]

see that the potential distribution within the surface layer is characterized by iAdon and j o, as schematically shown in Fig. 4.1b. [Pg.91]




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Charge layer

Charge potential

Charged surfaces

Charging potential

Donnan potentials

Layer thickness

Layered surfaces

Potential charge and

Surface charge

Surface charge layer

Surface charges surfaces

Surface charging

Surface layer thickness

Surface layers

Thick layers

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