Features and functions of silica gel powder
- 2022-06-08-
Silica gel powder is a colloidal system with solid properties, consisting of colloidal particles that form an aggregated structure. Colloidal particles are polycondensates of hydrated silica gel (polysilicic acid), which are amorphous substances. In reagent column chromatography, the voids of colloidal aggregates form a microporous structure inside the silica particles. Therefore, it is a high-quality adsorbent material with abundant microporous structure, high specific surface area, high purity and high activity. Silica gel powder is processed from silica gel as raw material. Its main feature is that it can absorb and retain different components in the mixture through different retention times; to achieve the purpose of separation and purification.
The role of silica gel powder
Silica gel powder has good thermal and chemical stability, and can selectively adsorb and purify isomeric components from multi-component solutions. In the process of preparing silica gel powder, by controlling different process conditions, a series of products with an average pore diameter of 20-20 000 A can be produced to suit the separation and purification of substances of different properties, molecular weights and molecular structures. The purity of silica gel powder is above 99%. Compared with organic column packings, silica gel is a solid colloid based on silica with a dense structure. Even if it is directly discarded, organic matter will be lost, contaminating the target product.
