Influence of Interfacial Interaction and Dewetting Effect between Substrate and Silica Sol on Mesoporous Structure Characteristics and the Effective Distance

Abstract

This work researches the influence of the dewetting effect and the interfacial interaction between substrate surface and silica sol containing template molecules on mesoporous structure of MBGs by using SU316 steel, glass, and polytetrafluoroethylene (PTFE) with different hydrophilic properties as substrates. It confirmed that the two factors have different effective distances. MBGs synthesized on PTFE have higher order degree than those synthesized on SUS316 steel when preparing thin films, while the opposite result is obtained when preparing thick films. The order degrees of MBGs prepared on all substrates increase following the increase of film thickness. By changing the substrates and sol film thickness, the pore size can be regulated from 5.8 nm to 8.1 nm; the pore volume can be adjusted from 0.366 cm3/g to 0.805 cm3/g; and the specific area can be regulated from 259.4 m2/g to 485.6 m2/g with a change of 28.4%, 120% and 87.2%, respectively. This work shows a principle and a simple method for synthesizing materials of different mesoporous structures.

Keywords: mesoporous, interfacial interaction, dewetting effect, substrate, bioactive glass, pore ordering