Role of surfactant on dispersing nanospherical MCM-41 mesoporous molecular sieves
表面活性剂对纳米MCM-41分子筛分散性的影响

Using polymer PEG as dispersant, cetyltrimethylammonium bromide (CTAB) as template and tetraethylorthosilicate(TEOS) as silica source, the monodisperse nanospherical MCM-41 mesoporous molecular sieves with the particle size of 40-60 nm were synthesized under basic media conditions. The influence of the PEG concentration on mesoporous structure and the dispersion of nanospheres were systemically studied. It showed that the morphology of particles changed little, but the dispersion of particles improved greatly. When polymer PEG was added, the mesoporous structure of samples including hexagonal order and the pore size changed. The samples still show perfect long-range order of hexagonal mesoporous structures. With the concentrations of PEG increased, the d100 values of samples in the XRD patterns enlarge. With the suitable PEG concentration, the monodispersenanospherical MCM-41 mesoporous molecular sieves with uniform diameters, single-pore distribution, huge pore volume. huge surface area and highly ordered mesoporous structure could be obtained.