How can it be demonstrated that colloidal particles are...

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Key Concepts

Electrophoresis

Electrophoresis is the process by which charged particles suspended in a fluid migrate under the influence of an electric field. Observing the motion of colloidal particles when an electric field is applied directly demonstrates that these particles carry a net charge, as their movement varies with the polarity and strength of the field.

Electrical Double Layer

The electrical double layer is a structure that forms at the interface between a charged colloidal particle and the surrounding liquid, consisting of a layer of adsorbed ions and a diffuse layer of counter-ions. The presence of this double layer not only stabilizes the colloid but also provides evidence of surface charge, which is a critical factor in the electrokinetic behavior of colloidal systems.

Zeta Potential

Zeta potential is the measure of the potential difference across the region of the electrical double layer at the slipping plane of the colloidal particles. It serves as an indicator of the effective surface charge and the stability of the colloidal suspension, and its measurement offers quantitative evidence of the charged nature of colloidal particles.

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