International Gold Number (IGN)
The International Gold Number (IGN) is a measure of the ability of a substance to stabilize gold sols. It is defined as the weight of the substance in milligrams that is required to prevent the coagulation of 10 ml of a gold sol containing 0.005% gold.
The IGN is an important parameter in the characterization of gold sols, as it provides information about the stability of the sol and its potential applications. A high IGN indicates that the substance is an effective stabilizer, while a low IGN indicates that the substance is not very effective.
The IGN is determined by measuring the absorbance of a gold sol as a function of the concentration of the stabilizing substance. The absorbance is a measure of the amount of light that is absorbed by the sol, and it is proportional to the concentration of gold particles.
The IGN is determined by adding increasing amounts of the stabilizing substance to the gold sol and measuring the absorbance of the sol after each addition. The IGN is the concentration of the stabilizing substance at which the absorbance of the sol is half of its maximum value.
The IGN is used to characterize a variety of substances, including proteins, polymers, and surfactants. It is also used to study the stability of gold sols under different conditions, such as pH, temperature, and ionic strength.
The IGN is a valuable tool for understanding the behavior of gold sols and their potential applications. It is a simple and reproducible measurement that can provide important information about the stability and properties of gold sols.
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