引子:incipient wetness method,初湿浸渍法。相关网络上解释为前驱体溶液的体积约等于载体孔体积的浸渍方法,如1gSBA-15,Vp=1cc/g,而取前驱体溶液为1-1.2cc/g.
文献:Sung Soo Park, Dongyuan Zhao et al, Facile synthesis of mesoporous carbon nitrides using the incipient wetness method and the application as hydrogen adsorbent, J. Mater. Chem., 2011, 21, 10801.
引言里提到 It has been known that the '' incipient wetness method'' is a very useful approach in nanocasting by hard-templating since only a minimal amount of reactant solutions are required to effectively fill the mesopore channels, and thus there are no excess reactants outside mesopores that usually lead to the formation of undesirable amorphous particles.
看他的实验部分
the cyanamide solution(氰胺溶液) was added to 0.3 g of SBA-15 and 0.3 g of cubic meso-SiO2 (0.47 ml for SBA-15 and 0.38 ml for cubic meso-SiO2), respectively. After mixing mechanically,the powders were carbonized at 550 °C for 3 h...
问题:我自己一直很怀疑这种所谓的IWM。尝试做过几次试验:拿0.47ml的液体滴到0.3 g SBA-15上。SBA-15明明只有少部分才“润湿”,其他白色粉末仍然是膨松的——纵然机械搅拌也是这样。用这种IWM,溶液会不会很差只润湿了孔外面,而压根没有理想中完全进入孔里面?
[ Last edited by shine6832 on 2012-7-22 at 20:05 ] |