The porous and porous materials have an external surface area and an internal surface area, such as asbestos fiber, rock (mineral) wool, diatomaceous earth, etc. Measurement methods include volumetric adsorption method, gravimetric adsorption method, flow adsorption method, ventilation method, and gas adhesion method. Below the critical temperature of the adsorbate, the equilibrium pressure of the adsorbate is usually expressed by the relative pressure X. Let Ps be the saturated vapor pressure of the adsorbate at temperature T, then X = P / Ps. When nitrogen is used as the adsorbate, some adsorption amount data of X in the range of 0.3-0.25 is usually selected. The adsorption isotherm is obtained by plotting v against X, which is the adsorption amount at each relative pressure.
Below the critical temperature of the adsorbate, the equilibrium pressure of the adsorbate is usually expressed by the relative pressure X. Let Ps be the saturated vapor pressure of the adsorbate at temperature T, then X = P / Ps. When nitrogen is used as the adsorbate, some adsorption amount data of X in the range of 0.3-0.25 is usually selected. The adsorption isotherm is obtained by plotting v against X, which is the adsorption amount at each relative pressure.
Specific surface analyzer is short for specific surface area analyzer. Specific surface area refers to the total area per unit mass of material. There are two types of external surface area and internal surface area. The unit is m2 / g. The size of the specific surface area of ​​the adsorbent and other porous materials such as asbestos, asbestos, has a significant impact on its thermal properties, adsorption capacity, chemical stability, and degree of cotton opening.
Compared with the surface analyzer, if the surface of the particle has holes, it is larger than the surface. Just one gram of powder expands their surface area, which can reach tens, hundreds, or even thousands of square meters, which is very surprising. The adsorption isotherm is a source of information about the pore structure of the adsorbent, the heat of adsorption, and other physical and chemical characteristics. The adsorption isotherm of the adsorbate can be obtained under the conditions of constant temperature and wide range of relative pressure.
Some clay mineral powders, etc .; porous and porous materials have an external surface area and an internal surface area, such as asbestos fiber, rock (mineral) wool, diatomaceous earth, etc. Measurement methods include volumetric adsorption method, gravimetric adsorption method, flow adsorption method, ventilation method, and gas adhesion method.
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