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固体有一定的几何外形,借通常的仪器和計算可求得其表面积。但粉末状或多孔性固体,例如常見的硅胶、硅酸鋁、活性炭、白土等吸附剂或催化剂,其表面积的测量就很困难,因其不仅具有不規則的外表面,而且还有弯曲的內表面,卽由毛细管壁或微孔内壁所組成的表面。通常以一克固体所占的总表面(外表面加内表面)称为該物貭的比表面(多以米~2/克表示)。
Solid geometry has a certain shape, by the usual instruments and calculations can be obtained by the surface area. However, the measurement of the surface area of powdered or porous solids such as common silica gel, aluminum silicate, activated carbon, clay and other adsorbents or catalysts is difficult because of not only having an irregular outer surface but also curved Surface, 卽 Surface consisting of capillary walls or micropore inner walls. The total surface (outer surface plus inner surface) usually occupied by one gram of solid is referred to as the specific surface area of the object (mostly in meters ~ 2 / gram).