Measuring zeta potential - electrophoresis

This is a recording of a webinar I gave on How To Measure Zeta Potential More Confidently.

I show you how you can maximize the confidence in your measurements - and their interpretation - needed for robust decision making.

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TRANSCRIPT

How can we access the zeta potential? What phenomenon can we exploit to provide us with some way of measuring the zeta potential? The most common is electrophoresis which is the motion of a charged particle in an electric field. If you apply an electric field using two electrodes then a particle will move towards the oppositely charged electrode and there'll be a balance between the force trying to move it towards the electrode -- the electrostatic force -- and the friction force due to the viscosity of the liquid. The resulting terminal velocity will be proportional to the electric field and the proportionality constant is called the electrophoretic mobility, mu.
 
At the same time, the diffuse layer of ions around the particle will try to move in the opposite direction towards the other electrode. Clearly, there's going to be some kind of balance between the two.

Видео Measuring zeta potential - electrophoresis канала John Miller