High amino content ordered mesoporous silicon dioxide film and its preparation method and application

Abstract

The invention relates to a preparing process and application sequential mesoporous silicon dioxide film with high amino content. The preparing process of the invention takes various surface active agent as template, takes tetraethyl ortho-silicate and 3-3-aminopropyl triethoxysilane as the silicon source, utilizing sol-gel manner, leading the amino silane to take the molar percentage of the whole silane of 30-60 by introducing amino silane directly part of silica sol, after forming homogeneous solution, relying on the synergy of the silane and organic templates, forming films by dip-coating on the clear substrate, finally forming functional sequential silicon dioxide film with different meso-structure and high amino content. The silicon dioxide mesoporous film of the invention has perfect assembly and fixing property to organic molecules, inorganic anions, protein, enzyme molecule and the like object materials.

Description

technical field [0001] The invention relates to a mesoporous silicon dioxide film, in particular to an ordered mesoporous silicon dioxide film with high amino content and its preparation method and application. Background technique [0002] At present, the biggest application prospect of mesoporous silica film is as the main material, using the ordered pores in the film layer to assemble various functional active molecules in it. Early studies found that very low loading rates were caused by the lack of interaction between mesoporous host materials and guest molecules. Organically functionalized mesoporous materials can solve this problem, because the surface organically functionalized mesoporous materials can increase the force between the guest molecules (van der Waals force, hydrogen bond, electrostatic force, etc.), or between the two form ionic and covalent bonds. Therefore, in recent years, many researchers have begun to pay attention to the preparation of functional...

AI Technical Summary

Problems solved by technology

However, it has several disadvantages: (a) many organic functional groups are grafted on the surface of mesoporous channels, which will lead to smaller pore size and pore volume of mesoporous channels; (b) the density of surface-active organosilanes is low, and organic functional groups (c) post-grafting is a time-consuming process, which includes two steps of preparation of parent pure silicon mesoporous film and silanization treatment; (d) grafting of organic groups in mesoporous channels Branch efficiency and average distribution are difficult to control

However, few researchers have discussed in detail the influence of organic groups and sol aging on the assembly of organic functionalized mesoporous films, especially when the initial sol contains a relatively high concentration of organosilanes, it is difficult to obtain mesoporous membranes with good order. film

In addition, all the mesoporous films reported above mostly use small-molecule surfactants, and the pore size of the prepared films is small, which cannot meet the needs of large-scale molecular assembly.