1965 Volume 38 Issue 10 Pages 1634-1637
The growth of particles in the polymerization of silicic acid has been investigated by means of light scattering. The following results were obtained:
1) Polymerization does occur for a long period, even after gelation.
2) While the aggregation is predominant near the gelation point, it seems to occur to a lesser extent even in the initial stage. The aggregate finally grows to as much as 800Å in diameter. It is of a porous and sponge like structure, including the solvent in it.
3) Hydrogel must be understood as an entity built up of secondary particles which also consist of primary ones. Consequently, hydrogel has prime structure and a substructure, by the former three-dimensional linkages among secondary particles are meant, while by the latter are meant those among primary particles.
4) There is a linear relationship between the scattering intensity of the hydrogel and the surface area of dried gel.
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