Growth of silica particles in sufactant gel

摘要

Growth of silica particles produced by the hydrolysis of tetraethoxysilane (TEOS) in gels of the cationic surfactant,cetyltrimethylammonium bromide (CTAB),was investigate dby static light scattering and dynamiclight scattering measurements.The time evolution of the size of the siliza particles was estimated by the static and the dynamci correlation lengths obtained from the two measurements.Both the growth rate and the finalsize were smaller at higher concentrations of CTAB,indicating that a more confined network exerted a more restrictive effect on the particle growth.The random motionof silica particles was more severely restricted wen the particle was larger and the network meshsize was smaller at higher CTAB concentrations.This restriction of movement resulted in the cessation of the growth of silica particles.