In our experiment, methanol, ethanol, and isopropanol are used
to compare and to observe the influence of the solvents on the particle size.
As shown in Table 1 and Table 3, coagulation can be obtained
when we choose methanol and ethanol as solvents at
1.24 M TEOS, and small particles can be formed with the increment
of polarity of solvent. This is because these three solvents have different
dielectric constants (methanol = 32.6, ethanol = 24.3, isopropanol
= 19.9), which affects the particles size in the growth process
[18]. The static repulsive force between nuclei is smaller than the
van der Waals attractive force when the solvent’s dielectric constant is smaller. Therefore, it promotes the reaction between nuclei,
and the formation of larger particles is easier
In our experiment, methanol, ethanol, and isopropanol are usedto compare and to observe the influence of the solvents on the particle size. As shown in Table 1 and Table 3, coagulation can be obtainedwhen we choose methanol and ethanol as solvents at1.24 M TEOS, and small particles can be formed with the incrementof polarity of solvent. This is because these three solvents have differentdielectric constants (methanol = 32.6, ethanol = 24.3, isopropanol= 19.9), which affects the particles size in the growth process[18]. The static repulsive force between nuclei is smaller than thevan der Waals attractive force when the solvent’s dielectric constant is smaller. Therefore, it promotes the reaction between nuclei,and the formation of larger particles is easier
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