I. Product introduction

The mesoporous molecular sieve SBA-15 has large  specific surface area, uniform ring channel diameter distribution, adjustable Aperture, thick wall and high hydrothermal stability, so SBA-15 has broad application prospects in the fields of catalysis, separation, biology and nanomaterials.

Large Aperture on SBA-15 is conducive to the transportation of reactants in the pore channel and the further progress of the reaction. With the increase in the amount of reactants introduced, nanowires of various materials with one-dimensional structure are synthesized in the pore channel one after another.

Synthesis of mesoporous molecular sieve SBA-15 conforms to the neutral template mechanism: bonding via hydrogen between neutral surfactant P123 and neutral inorganic silicon species, without strong electrostatic effects, and the accumulation of short-range hexagonal colloidal particles and formation of skeleton because of further hydrolysis/condensation of silanol.

The synthesis condition of SBA-15 is mild, the surfactant is easy to remove, and it is not easy to cause structure collapse. The repulsive force between the neutral surfactant and the neutral inorganic precursor is much smaller than that between the ionic surfactant and the charged inorganic precursor, which can form a thicker pore wall, thus improving the thermal and hydrothermal stability of the molecular sieve skeleton.

Mesoporous molecular sieve SBA-15 has great application value in separation, catalysis and nanometer assembly, etc. However, its practical application range is greatly limited due to its low chemical reactivity and other disadvantages. In order to realize the potential application value of mesoporous molecular sieve SBA-15, it has become a major research subject to improve its hydrothermal stability and chemical reactivity by chemical modification.

Chemical modification includes modification of material skeleton and functionalization of pore surface. According to the study on the surface chemical properties of mesoporous materials, the silanol bonds on the surface of mesoporous silica materials have certain chemical reactivity, which is the basis of surface chemical modification. The surface of SBA-15 is modified differently consciously to meet different requirements in practical application.

II. Typical indicators