TABLE 1.
Notations used
| Symbol | Meaning |
|---|---|
| ψ | Electrostatic potential (volts) |
| ψD | Donnan potential, the constant potential well inside the membrane |
| ψ0 | Surface potential, ψ(x = 0) |
| ɛ0 | 8.85419 × 10−12 F/m, vacuum permittivity |
| ɛm | Dielectric constant of the membrane |
| ρm | Fixed charge density in the membrane (C/m3) |
| ɛs | Dielectric constant of the solution |
| Cib | Concentration (mol/m3) of particular ionic species in the bulk, far away from the membrane |
| N | Total number of different ionic species in solution |
| Zi | Charge of ionic species (integer number) |
y =  |
Reduced potential (dimensionless number) |
yD =  |
Reduced Donnan potential (dimensionless number) |
| y0 = y(x = 0) | Reduced surface potential |
| F | 9.6485 × 104 C/mol (Faraday constant) |
| R | 8.31451 J/(mol K) (universal gas constant) |
| T | Temperature (300 K used) |
| u | dy/dx (gradient of the reduced potential) |
| I | Ionic strength of solution |