Influence of surface chemical heterogeneity on attachment and detachment of microparticles

- We examine effect of chemical heterogeneity on colloid attachment and detachment.
- A critical size of a positive patch on a negative plane is needed to attach a colloid.
- The colloid attached on chemical heterogeneity is irreversible to reducing ionic strength.
- The presence of chemical heterogeneity increases irreversible attachment in primary minima.