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Why does silica sol have storage stability?
Published:
2020-08-18 10:54
Silicasol is the dispersion of nano silica, and the particle size of nano particles is generally 3-150nm. The density of nano silica in silica sol is 2.2-2.3, while the density of water is 1, with a significant difference in density. However, we observed that silica sol can maintain suspension stability for a long time. Why is this?
Ordinary silica sol is an aqueous dispersion of nano silica, with negative charges on the surface of the particles. Therefore, there is a repulsive effect of the same charge between the particles, so agglomeration does not occur. This is the fundamental reason for the stability of the silica sol suspension system. In addition, the thermal movement of water molecules will constantly impact the nanoparticles, so that the nanoparticles are also in motion (Brownian motion), so the silica sol with small particle size can be suspended and stable for a long time, for example, the silica sol with particle size less than 50nm can be left standing for a long time without particle sedimentation; However, when the particle size of the silica sol is greater than 80nm, after several months of standing, obvious particle sedimentation can be observed, and precipitation can be observed at the bottom of the silica sol container. However, this precipitation is a "soft precipitation", which will be re dispersed evenly after stirring and return to the original state. The reason why this "soft precipitation" can return to a uniform liquid is because of the charge effect on the surface of the nanoparticles, and there is electrostatic repulsion force between the particles.
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Why does silica sol have storage stability?
Silicasol is the dispersion of nano silica, and the particle size of nano particles is generally 3-150nm. The density of nano silica in silica sol is 2.2-2.3, while the density of water is 1, with a significant difference in density. However, we observed that silica sol can maintain suspension stability for a long time. Why is this?
Precautions for the use of silica sol
Although silica sol can maintain suspension stability for a long time, some precautions should be taken during storage, otherwise irreversible damage may occur.
Structure and stability of silica sol
Silica sol is a dispersion of nano silica particles in water or solvent. Silica sol is widely used in CMP polishing fluids, special coatings, papermaking, textiles, precision casting, refractory materials, catalyst carriers, precision ceramics and other fields.