A note on the terminology of colloid stability

A coagulated aggregate separates out by creaming or sedimentation, depending on the density differences, as explained by Stokes law, which we have seen in Chapter 8. 

Flocculation and creaming are reversible phenomena, while coagulation is not. 

There are both similarities and differences between interparticle and intermoleculai potential functions. The most important difference is, possibly, that interparticle forces are much more long-range than those between molecules. Let us recall the most important characteristics of this plot the vdW attractive forces (negative V) which lead to instability (aggregation) and the repulsive electrical forces (positive V), which are due to the fact that the particles are charged, which help flie stability . 

Surfaces repel strongly small colloidal particles remain stable . 

Surfaces come into stable equilibrium at the secondary minimum if it is deep enough colloids remain stable . 

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