engleski

Silver-iodide suspensions

In order to determine the exact cr.itical coagulation concentration ck (the lowest concentration of present electrolyte at which the colloid stability begins to decrease), the coagulation concentration cc (lowest electrolyte concentration causing total sedimentation of the suspension particles), the critical stabilization concentration cs (lowest electrolyte concentration causing an increase of colloid stability or peptization) and the stabilization concentration sc (lowest electrolyte concentration at which all the colloid particles are suspended) an experimental method was developed. As a model system silver iodide sols with magnesium nitrate and with n-laurylamine in the presence of sodium iodide were applied. By radiometric analysis of the distribution of constituent ions between the crystal lattice and the electrolyte, and by centrifugation of samples at various relative centrifugal forces it is possible to determine the real coagulation concentration cc and the real stabilization concentration sc exactly, as shown for the investigated systems.

silver iodide sols ; stability

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