The hygroscopic principle of Desiccant silica gel (silica desiccant) is mainly based on its porous structure and physical adsorption.

Silicone desiccant is an amorphous silica particle with a large number of microporous structures inside. These micropores allow silicone desiccants to have a huge specific surface area, usually up to hundreds to thousands of square meters per gram, thus being able to fully contact and adsorb water molecules in the surrounding environment.

When the silicone desiccant is exposed to a humid environment, the micropores inside it will adsorb water molecules in the surrounding environment. This adsorption effect is based on the physical adsorption force between the surface of the silicone desiccant and the water molecules, i.e. the van der Waals force. Due to the presence of micropores inside the silicone desiccant, these micropores are like capillaries, which produce a strong adsorption force on water molecules. When water molecules enter micropores, they will be adsorbed by the pore walls and are difficult to escape, thus achieving an effective dehumidification effect.

In addition, silicone desiccant usually does not undergo chemical reactions during the hygroscopic process, so its hygroscopic properties are stable and long-lasting. When the silicone desiccant reaches saturation, it can be regenerated by heating to restore its moisture absorption capacity.

To sum up, the hygroscopic principle of Desiccant silica gel is to use its porous structure and physical adsorption to adsorb water molecules in the surrounding environment, thereby achieving dehumidification effect.