The morphology of SiO2 was observed by SEM. Figure 2 illustrates that the particles are predominantly spherical in shape with diameter ranging from 20 to 25 nm. Larger and uneven shaped particles with diameter 35–70 nm were also obtained.
The morphology of SiO2 was observed by SEM. Figure 2illustrates that the particles are predominantly spherical inshape with diameter ranging from 20 to 25 nm. Larger anduneven shaped particles with diameter 35–70 nm were alsoobtained.