Explanation of Zeta Potential
Things to note:
The particle (orange) has a surface with negative charge.
In the water near the particle (purple) there is first a layer of mostly plus ions.
After the shell of mostly plus ions is a shell of mostly minus ions.
As distance from the partilce increases, the mix of plus and minus ions
reaches the equality of the bulk fluid.
The outer circle is about where the ions are equally distributed.
Movement of ions in the two shells at the surface of the particle ( the Helmholtz
double layer ) is greatly restricted. They accompany the particle and dissipate some of its
charge. After these two shells, there is a "slip plane". The zeta potential is the
difference in charge between the bulk and the particle with its held, attracted ions.
What you should remember.
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