Brunauer–Emmett–Teller (BET) theory aims to explain the physical adsorption of gas molecules on a solid surface and serves as the basis for an important analysis technique for the measurement of the specific surface area of materials.

BET理论计算是建立在Brunauer, Emmett和Teller三人从经典统计理论推导出的多分子层吸附公式基础上，得到单层吸附量Vm，然后计算出比表面积 [2, 3]。 V—平衡压力为P时，吸附气体的总体积。 Vm—催化剂表面覆盖第一层满时所需气体的体积。 P—被吸附气体在吸附温度下平衡时的压力。 P0—饱和蒸汽压力。 C—与被吸附有关的常数。 BET方程在多层吸附理论的基础上建立了单层饱和吸附量Vm与多层吸附量V之间的关系，与许多物质的实际吸附过程更相似，测试可靠性 …

Brunauer-Emmett-Teller (BET) theory aims to explain the physical adsorption of gas molecules on a solid surface and serves as the basis for an important analysis technique for the measurement of the specific surface area of materials.

Aug 28, 2022 · The BET technique was used to determine the surface areas of metal-organic frameworks (MOFs), which are crystalline compounds of metal ions coordinated to organic molecules. Possible applications of MOFs, which are porous, include gas …

在更高p/p0时有时会有第三段上升，可以反映出样品中大孔或粒子堆积孔情况。由N2-吸脱附等温线可以测定其比表面积、孔容和孔径分布。对其比表面积的分析一般采用BET（Brunauer-Emmett-Teller）方法。孔径分布通常采用BJH（Barrett-Joiner- Halenda）模型。

Jan 1, 2015 · The BET equation is used for determining the surface area of solids from the nitrogen sorption isotherm at liquid nitrogen temperatures, but the equation has also been used with a wide range of other gases and vapours.

Mar 15, 2012 · For ν1 ≈ ν2, which is a realistic approximation as the pressure and the surface coverage increase, V tends to Vm. At this limit, Eq. (4) applies. To cite an example at 77 K, RT = 0.6 kJ mol −1. Then for (q1 − qL) = 4.2 kJ mol −1, C ≈ 1100, whereas for (q1 − …

Oct 13, 2024 · The BET analysis is a cornerstone technique in material science for evaluating the surface area and porosity of materials through nitrogen (N2) adsorption-desorption isotherms. This method is essential for characterizing porous materials such as catalysts, adsorbents, and nanostructured materials.

The BET instrument applied by Particle Analytical (Micromeritics Gemini 2375 and Gemini V) determines the specific surface area (m²/g) of pharmaceutical samples.

BET Theory seeks to explain the physical adsorption of gas molecules onto solid surfaces