Preparation of nanoporous SiO_x materials via interpenetrating polymer network method

摘要

In this letter, polyacrylamide gels with SiO_3~(2-) and Na~+ ions in the porous were prepared by using free-radical aqueous polymerization method. Nanoporous SiO_x materials were prepared by heating the polyacrylamide gels with colloid of silicic acid in porous to 600 ℃ and held at this temperature for 24 h. The porous size of nanoporous SiO_x materials in the obtained samples was investigated by scanning electron microscopy (SEM) and the average porous size is 50 nm in diameter. From SEM image, we can see the porous size distribution is narrow, but the porous array is irregular. Nanoporous SiO_x materials were investigated from the X-ray photoelectron spectra (XPS) spectra and infrared spectrum of the obtained samples. The chemical mechanism for the formation of nanoporous SiO_x materials is discussed.