nitrogen physisorption

Nitrogen physisorption is a technique used to analyze the surface and pore structure of materials by measuring how nitrogen gas interacts with their surfaces at very low temperatures. When nitrogen molecules are introduced to the material, some adhere to the surface (adsorption) while others fill the tiny pores or spaces within. By measuring the amount of nitrogen that accumulates at different pressures, scientists can determine surface area, pore size, and porosity. This method provides valuable insights into the material's texture and structure, important for applications like catalysts, filters, and adsorbents.