What is specific surface area and factors that affect specific surface size

1.Definition of specific surface area unit

Specific surface area, the total area per unit mass of a substance, in international standard units of ㎡/g. Divided into external surface area and internal surface area; Ideal non porous materials only have an outer surface area; Porous materials have both inner and outer surface areas.

2.Factors affecting the size of specific surface area

Specific surface area is an important parameter for measuring material properties, which is closely related to particle size, shape, and pore structure. The specific surface area size affects physical and chemical properties.

Specific surface area is one of the important characteristics of powder materials, mainly manifested in the finer the powder particles, the larger the specific surface area, the stronger the surface effect, and the higher the surface smoothness.

The determination of specific surface area of porous materials is of great significance in scientific research and industrial production. In general, porous materials with a larger specific surface area have stronger adsorption capacity; Dust like substances, with smaller particle size and larger specific surface area, have stronger physical and chemical activities, such as evaporation, oxidation, dissolution, catalysis, etc., which will accelerate due to a decrease in particle size and an increase in specific surface area.