When two surfaces are separated from each other by water the exclusion zone forms at each surface.
Hydronium Ions (positive charge) are then ejected into the center of the fluid. The two like charges will reject each other.
Where the positive charge meet in the center of the fluid, an opposing force is generated. This keeps the surfaces from making contact with one another.
This becomes more evident when you keep in mind that cell walls create a million times more charge potential (relative to their size) than is used by high-voltage power transfer cables.
Thus friction can be reduced by strengthening or increasing the exclusion zone.