Abstract
Measurements of double-layer potentials φ δ in AgI hydrosols at equal coagulation rates reveal that φ δ is low and inversely proportional to the counterion charge. It is also found to be proportional to the square root of the double-layer thickness so that AgI is seen to follow the Eilers-Korff criterion. AgI is a rather typical model system for electrocratic colloids. This implies that phenomena regarding the stability and the coagulation of electrocratic colloids such as the Schulze-Hardy rule and the linear log W-log c relationship could result from the effect of added electrolyte on φ δ rather than on the range of the double-layer repulsion.
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