Preparation of nano-sized mesoporous silica dioxide and Al-doped silica dioxide at extremely low reactant concentration

• 1、Department of Chemistry & chemical Engineering, Lanzhou University
• 2、Laboratory of Advanced Materials, Department of Materials Science & Engineering, Tsinghua University,

Abstract：Synthesis of nano-sized mesoporous silicon dioxide and that with Al doped were preformed at extremely low reactant concentration, and the products were controllable in size (20nm~70nm), morphology and pore structure by changing the amount of deionized water or Al source in the reaction. The samples were of higher BET surface area (more than 1000 m2/g) and pore volume (1.1~1.8 cm3/g). The pore structure became less ordered, the particle size decreased, the pore volume increased and a certain accumulation of holes appeared when decreasing reactants concentration or introducing Al source in the reaction. The nano-sized mesoporous samples were characterized by transmission electron microscopy (TEM), small-angle X-ray diffraction, as well as nitrogen adsorption/desorption techniques.

Keywords： extremely low reactant concentration nano-sized mesoporous silicon dioxide self-assembly morphology control Al-doped