The supercritical fluid has the diffusivity similar to gas and the solubility of liquid, and at the same time has the characteristics of low viscosity and low surface tension, which enables the supercritical fluid to quickly penetrate into the micropore
Using the nitrogen adsorption method to determine the specific surface, the key is to get the saturation adsorption of a single layer, but the adsorption characteristics of most materials are not single-layer adsorption, but the so-called multi-layer ad
Yang Chunzhen Wang Zhilong (Yumen Oil Field Branch Refinery and Chemical Plant) Abstract: Four test methods used at home and abroad to determine the solid content of catalytic unit oil slurry were compared
aerogel, English aerogel also known as dry gel. When the gel removes most of the solvent, the liquid content of the gel is much less than the solid content, or the spatial network structure of the gel is filled with the medium is gas
If it is large-scale production of aerogel, atmospheric pressure method is more feasible, because the equipment cost and production cost are low, but the process is complex and uncertain factors. If the supercritical method is recommended in the laborator
Sem samples are observed in a high vacuum. Whether it is water or dehydrated solution, it will produce violent vaporization in high vacuum, which will not only affect the vacuum degree, pollute the sample, but also destroy the sample
