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Previous studies of mesoporous silica
shell growth on nanoparticle surfaces suggest a three-stage
mechanism for the formation of the mesoporous shell: silica
oligomerization, formation of silica/CTAB primary particles,
and the aggregation of the primary particles.19 In this system,
the CTAB surfactant molecules were strongly localized on
the nanoparticle surfaces compared to in solution (0.0015
M), causing silica/CTAB primary particles to form and
aggregate directly on the nanoparticle surfaces, which may
have promoted mesoporous shell growth compared to free
mesoporous silica particle formation.
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