Influence of surfactants on sedimentation stability of hydrophilic suspensions

The influence of the concentration of sorbitan monooleate, decylpyridinium chloride, and sodium dodecyl sulfate solutions on the stability of hydrophi lic suspensions of SiO2 and CaF2 was studied. In the range of low surfactan t concentrations, the sizes of the dispersed phase particles were found to increase with surfactant concentration. At the surfactant concentrations lo wer than a critical micellization concentration, the contact time of partic les with the dispersion medium critically affects the aggregation stability . At surfactant concentrations equal to the CMC, particle size distribution does not change compared to the initial system and is independent of the c ontact time of the particles with a solution.