7P.Chattopadhyay,R.B.Gupta.Supercritical CO2-based formation of silica nanoparticles using water-in-oil microemulsions[J].Ind.Eng.Chem.Res.2003,42:465-472.
8Jianling Zhang,Zhimin Liu,Buxing Han,et al.A simple and inexpensive route to synthesize porous silica microflowers by supercritical CO2[J].Microporous and Mesoporous Materials,87,2005,10:-14.
9X.Cai,R.Y.Hong,L.S.Wang,et al.Synthesis of silica powders by pressured carbonation[J].Chemical Engineering Journal,2009,151:380-386.
10Gui-Mei Gao,Hai-Feng Zou,Shu-Cai Gan,et al.Preparation and properties of silica nanoparticles from oil shale ash[J].Powder Technology,2009,191:47-51.