Joint development of insight into colloid stability and surface conduction

This paper presents a historical overview of the parallels between the developments of colloid stability and surface conductivity. Starting from the situation during the Second World War, the interaction between the developments of these two branches of science appeared mutually beneficial. In particular, the properties of the non-diffuse parts of the double layers drew much attention. Implementations in the direction of future developments are given.

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► The valence dependence of the coagulations concentration is lower than according DLVO theory.
► Monovalent ions in the Stern layer are laterally mobile.
► Interpretation of streaming potentials mostly requires insight into surface conduction.
► All three double layer parts participate in charge regulation upon interaction.