Surface Area


Surface Area is a measure of the exposed surface of a solid sample on the molecular scale. The BET (Brunauer, Emmet, and Teller) theory is the most popular model used to determine the area; results according to the Langmuir model are also available.

Samples are commonly prepared by heating while simultaneously evacuating or flowing gas over the sample to remove the impurities. The prepared samples are then cooled with liquid nitrogen and analyzed by measuring the volume of gas adsorbed at specific pressures.

How Specific Surface Area Is Important to your Products Performance

Surface area and porosity are physical properties that impact the quality and character of solid phase, porous materials. Materials that have identical weight and volume, may differ in surface activity and adsorption volume according to the specific surface area they exhibit.

During processing, especially in particle size reduction, the specific surface area of your product can change. Any subsequent change during the manufacturing process may affect the porosity and surface area. These changes can lead to an unexpected change in desired performance.

Surface area measurement is an important analysis used in many industries, including catalysts, zeolites, MOFs, batteries, absorbents, artificial bone, pharmaceuticals, ceramics, metal powders for additive manufacturing along with a wide variety of other applications and industries.

Our lab has several types of instruments for measuring surface area, the instrument selected depends upon the extent of the surface or the gas required to achieve the best results.

Available tests:

  • N2 surface area
  • Kr surface area
  • Single point BET surface area tests using flowing gas technique
  • BET Surface Area