Silica nanoparticles occupy a prominent position in scientific
research, because of their easy preparation and their
wide uses in various industrial applications, such as catalysis,
pigments, pharmacy, electronic and thin film substrates,
electronic and thermal insulators, and humidity sensors [1].
The quality of some of these products is highly dependent
on the size and size distribution of these particles.
Stober et al. [2], in 1968, reported a pioneering method
for the synthesis of spherical and monodisperse silica
nanoparticles from aqueous alcohol solutions of silicon
alkoxides in the presence of ammonia as a catalyst, and
different sizes of silica nanoparticles were prepared ranging
from 50 nm to 1 µm with a narrow size distribution.
The size of particles depends on the type of silicon alkox-