Studies of the pumping effect on the nanoporous microstructure of disordered mesoporous silica materials prepared by calcinations of PMMA-silica hybrids

We present the first comparative studies of pumping effect (i.e., exhaustive vacuum evacuation) on the as-prepared nanoporous microstructure silica to elucidate the effect of different preparative procedure on a series of obtained disordered mesoporous silica materials. The as-prepared hybrid materials (PMMA-silica) through the pumping treatment exhibited higher thermal decomposition temperature (Td) and density (D) than these system without pumping treatment based on the studies of thermogravimetric analysis and density measurements and compared with the nanoporous materials by calcinations of PMMA-silica materials was found to exhibit a significant higher value of surface area (ABET) based on N2 adsorption–desorption isotherm. Furthermore, a marked decrease in ABET and VBJH of as-prepared mesoporous silica are observed as the feeding content of TEOS is increased. The morphological images of as-prepared hybrid sol–gel glasses and their corresponding disordered mesoporous silica materials were also studied by scanning electron microscopy and transmission electron microscopy.