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Synthesis of nano-silicon dioxide:

Uniform size monodisperse silicon dioxide nanoparticles prepared by hydrolysis of TEOS in an ethanol medium in the presence of ammonium hydroxide. Figure 1 is a schematic representation of the preparation of synthetic silica particles and homogeneous samples by the following steps. 

First, the ethanol is stored in the sonication bath. After 10 minutes, a known volume of TEOS was simultaneously subjected to sonication, and after 20 minutes, 28% ammonium hydroxide solution as a catalyst was added to promote the condensation reaction. An additional sonication was continued for 60 minutes to obtain a white turbid suspension. All of the above experiments were carried out at room temperature.

Characterization of nano-silicon dioxide:

The silicon dioxide particles were prepared using a sequential addition technique using a sol-gel process in a sonication bath. The concentration of one of the reagents is fixed, and the concentration of the other reagents changes one by one to carry out different types of experiments. 

The size of the particles was measured using a field emission scanning electron microscope (FE-SEM, JEOL, F 6500, Japan). The clean glass capillaries are used to transfer the droplets of each sample to highly oriented pyrolytic graphite (HOPG). Allowing the sample to be dried, and then the micrographs are obtained at random locations on a large number of grids. From the SEM photograph, in almost all cases, the size of the particles was calculated using an average of 100 to 200 particles. The electron absorption behavior was analyzed using a UV PC spectrophotometer (Shimadzu, Japan, 3100).



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