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Charge-stabilized silica spheres

The advent of concentrated monodisperse silica sols in the 1950s appeared to offer an ideal model to test the DLVO theory a stable system of solid spheres with a particle diameter that could be varied in a broad range from about 5 to 100 or 300 nm. However, it soon became quite evident to many researchers, both in Iler s laboratories and elsewhere, that silica sols do not conform to the DLVO theory as originally formulated (27-32). As an example, Figure 9 illustrates the problem, showing an area in the stability-pH curve of experimentally proven relative stability (metastability) of silica sols at around the zero point of charge where the theory predicts minimum stability. In addition, the plot of experimental... [Pg.31]

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