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zxs1989
½ð³æ (ÖøÃûдÊÖ)
- ·ÒëEPI: 27
- Ó¦Öú: 12 (СѧÉú)
- ½ð±Ò: 1327.7
- Ìû×Ó: 2150
- ÔÚÏß: 612.2Сʱ
- ³æºÅ: 1122965
| Adsorption is generally classified as physisorption (van der Waals forces dominate between adsorbates and adsorbents) and chemisorption (chemical bonding exists between adsorbates and adsorbents). Here we mainly discuss the utilization of physisorption of inert gasses (generally N2 or Ar) to characterize mesoporous materials. It¡¯s one of the most popular and effective methods for mesoporous material characterization. Such information as specific area, pore volume, pore size distribution and some surface characteristics of the tested material can be obtained using this method. Adsorption isotherms are generally divided into six types (IUPAC). Type I isotherms show an obvious increase of adsorption capacity at low pressure and the subsequent plateau due to saturation of adsorption capacity. Type I isotherms are generally indicative of filling of micropores (< 2 nm) by monolayer gas molecules, but adsorption of N2 onto functional-group-modified mesopores also exhibits this shape sometimes due to the reduction of pore size to the range of micropores by grafting functional groups. Multilayer adsorption can occur on the surfaces of nonporous or macroporous materials, generally showing Type II or III isotherms. Type III isotherms are attributed to weak gas-solid interactions on the solid surface and are not common. Disordered mesoporous materials also generate Type II or III isotherms in general. It has been reported that mesoporous materials with residual surfactants display Type II isotherms. Type III isotherms are commonly obtained when water molecules are adsorbed onto hydrophobic mesoporous materials. Type IV and V isotherms have the characteristics of drastic increase of adsorption capacity caused by capillary condensation after multilayer adsorption and they are typical for mesoporous materials. The more abrupt the change caused by capillary condensation is, the pore size distribution is more uniform. The difference between Type IV and V isotherms mainly lies in the multilayer adsorption stage, and as the difference between Type II and III isotherms, results from different surface properties of solid materials. Type VI isotherms are attributed to successive multilayer adsorption onto homogeneous nonporous surfaces. |
2Â¥2011-03-20 22:37:34
zxs1989
½ð³æ (ÖøÃûдÊÖ)
- ·ÒëEPI: 27
- Ó¦Öú: 12 (СѧÉú)
- ½ð±Ò: 1327.7
- Ìû×Ó: 2150
- ÔÚÏß: 612.2Сʱ
- ³æºÅ: 1122965
3Â¥2011-03-20 22:39:26
4Â¥2011-03-24 15:02:03













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