Is Charge Essential for Colloids? A Review of Zeta Potential

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Colloidal particles typically carry a charge, which is crucial for their stability and prevents coagulation. This charge arises from various mechanisms, including the adsorption of ions from the surrounding medium and the ionization of surface groups on the particles. While size contributes to the buoyancy of colloids, it is the charge that plays a vital role in maintaining their dispersion. For instance, gold sols are often negatively charged, while biological fluids like blood can exhibit a positive charge. Understanding the concept of zeta potential is essential, as it quantifies the charge and stability of colloidal systems, indicating that charge is generally necessary for colloids to remain stable in suspension.
jd12345
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IS there charge on all colloidal partciles? My book states that charge is the reason why colloidal partciles are stable, otherwise they would coagulate
I always thought that it was their size that made them float.
I don't understand how they attain charge - they are not like ionic compounds such that they would get charge
For example :- metals sols like gold sols are negatively charged , blood is positvely charged
I don't get it. Where does this charge come from??
IS it necessary for colloids to have charge?
 
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