ABSTRACT
In contrast to molecular solutions, solid-liquid dispersions are heterogeneous; these systems are characterized by the presence of interfaces between the particles and the dispersion liquid. The systems are not in thermodynamic equilibrium and therefore are unstable against aggregation. This is why the stability of colloidal systems is the crucial point of colloid chemistry, and coagulation is one of the most important mechanisms for the transition to a more stable state for most colloidal systems. Coagulation that leads to aggregates is of major importance for colloidal systems. These aggregates can have different degrees of stability. Some aggregates are stable for only a few seconds, while others can be stabilized for years. This is valid, e.g., for AgI or Ag2S3 if other electrolytes have been removed.
