What method is used to measure the particle size of silica sol?

1.Alkali titration

The number of hydroxyl groups on the surface of silica sol has a certain corresponding relationship with the surface area. Select a certain pH range, and use the empirical formula to calculate the specific surface area of silica sol by titrating the amount of OH-ions adsorbed by surface hydroxyl groups, and then calculate the average particle size. This method It is usually used for the detection of quality control in the production process of small particle size silica sol.

2.Optical dynamic scattering method

Since there is a corresponding relationship between the particle size and the moving speed, the moving speed of the particles in the silica sol is measured by a laser particle size distribution analyzer, the particle size and distribution are calculated and counted, and the particle size distribution line is drawn vividly. This method is usually used for largeparticle silica sols Quality control during production.

3.Electron microscope observation method

Electron microscopy is used to directly observe particle size and distribution, which is usually used in production process development and research.