Question

How does the presence of electrical charge on colloidal particles keep a hydrophobic sol stable?

Answer 1

The presence of an electrical charge on hydrophobic colloidal particles causes them to carry similar charges, which results in mutual electrostatic repulsion among the particles. This repulsion prevents the particles from aggregating and settling down, thus maintaining their dispersion and stabilizing the hydrophobic sol. Hence, the charge keeps the colloidal particles apart, ensuring the stability of the sol over time. This electrostatic stabilization is crucial for preventing coagulation in hydrophobic sols.