Capillary electrophoresis i.k.
appear due to ionization of the surface due to acidbase equilibrium and / or adsorption of the
ionized particles on the surface. In the quartz capillaries can occur both, however EOF mainly
caused by dissociation of silanol groups (SiOH), which exist in the anionic form SiO, as
shown in Figure 3a.
To neutralize the charge counter ions are adsorbed on the surface and form an
electrical double layer, which causes a potential difference, a socalled ζpotential (Figure
3b). If now apply a voltage, the cations of the diffuse double layer migrate in the direction of
the cathode
annaabi.ee 
