If no salt bridge were used, this increasing electrostatic potential difference would counteract the electrochemical potential difference and eventually prevent further net flow of electrons.
In other words, zeta potential is the potential difference between the dispersion medium and the stationary layer of fluid attached to the dispersed particle.
The electric potential outside each material is controlled by its work function, and so dissimilar metals can show an electric potential difference even at equilibrium.
However, the water pores are completely impermeable to charged species, such as protons, a property critical for the conservation of the membrane's electrochemical potential difference.
The electric charge that has been separated creates an electric potential difference that can be measured with a voltmeter between the terminals of the device.
