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多孔硅胶是凝胶渗透色谱用的一种填料。它具有化学惰性好,可用于除碱性外各种溶剂;机械强度高,能承受高压不破碎;热稳定性好,在高温溶剂下经久耐用等优点。并且它装柱简单,可直接使用干胶装柱。不溶胀,可在柱中直接更换溶剂。使用寿命长,可反复装柱且数据重复,在色谱中对液流的阻力小。有良好的分离效率。在制备各种孔径的多孔硅胶时,一般都以小孔径的硅胶作为原料,通过适当的方法来“扩孔”使孔径扩大1—2个数量级,以得到所需要孔径范围的硅胶。扩孔方法通常采用焙烧法在炉中焙烧。它操作简单,容
Porous silica gel is a gel permeation chromatography with a filler. It is chemically inert, can be used in addition to various solvents outside the alkaline; high mechanical strength, can withstand high pressure does not break; thermal stability, durable in high temperature solvents and other advantages. And it is simple column packing, can be directly used dry column packing. No swelling, the solvent can be changed directly in the column. Long service life, repeated column loading and data repetition, the resistance to liquid flow in the chromatogram is small. Have a good separation efficiency. In the preparation of porous silica gel of various pore sizes, silica gel of small pore size is generally used as a raw material, and “pore expansion” is carried out by a suitable method to expand the pore diameter by 1-2 orders of magnitude to obtain the silica gel in the required pore size range. The reaming method is usually roasting in a furnace. It is simple to operate