Stable colloids at the isoelectric point: Dipolar vs. electrostatic interactions

- A nonuniform charge-3 patches model is proposed for rationalizing published results.
- The model relies on different values and variations of average and polar ξ-potentials.
- Polar ξ-potential influence stronger electric polarizability and colloid stability.
- Stability is better explained with electrostatic than with dipolar interactions.
- The suggested model might explain better misfits between stabilities and ξ-potentials.