ELECTROCHEMICAL TERMS IN COLLOID AND SURFACE CHEMISTRY

Surface charge density		${\sigma}^0$, ${\sigma}^s$
Surface charge density in the Stern layer		${\sigma}^i$
Surface charge density in the Gouy layer		${\sigma}^d$
Point of zero charge		pzc
Surface potential		${\psi}^0$,${\psi}^s$
Electric potential at the inner boundary of the Gouy layer, Stern-plane potential		${\psi}^{d}$
Differential capacitance (of the electrical double-layer per unit area) ( $=\mathrm{d}{\sigma}^0/\mathrm{d}{\psi}^0$)		$C_{\text{dl}}$
Integral capacitance (of the electrical double-layer per unit area) ( $= {\sigma}^0/{\psi}^0$)		$K_{\text{dl}}$
Isoelectric point		iep
Thickness of the diffuse electrochemical double layer ( = Debye length)		$1/{\kappa}$
$[= \sqrt{{\epsilon}_r {\epsilon}_0 RT/(F^2 {\sum}c_iz_i^2)}$ (rationalized four quantity system)$]$
Donnan emf (Donnan potential)		$E_D$
Membrane emf (Membrane potential)		$E_m$
Suspension effect (Pallmann effect, Wiegner effect)		$E_s$