Preparation and characterization of octyl methoxy cinnamate (OMC; 2-ethylhexyl-p-methoxy cinnamate)-trapped mesoporous silica using lecithin

摘要

The octyl methoxy cinnamate(OMC; 2-ethylhexyl-p-methoxy cinnamate)-trapped mesoporous silica samples were synthesized using lecithin, which may be isolated from either yolk or soybeans. Lecithin was used as a hydrophobic surfactant and emulsifier for making nano-emulsified OMC before trapping the latter in the pores of mesoporous silica. These organic/inorganic hybrid materials were prepared, using the sol-gel method, according to two different groups of surfactant-solvents-lecithin-ethanol (group-LE) and CTAC-water (group-CW). Their structures, pore sizes, surface areas, degrees of stability, degrees of solubility, and other properties were examined and compared. All the samples showed that the nano-emulsified OMC that had been trapped in the rod micelle of silica was stably encapsulated and immobilized. The group-LE samples had relatively larger pore sizes and were better able to trap and release their control of the nano-emulsified OMC compared to the group-CW samples. The group-LE and group-CW samples showed the average pore sizes of 7.18 nm and 2.64 nm as well as the surface areas of 182.43 m~2/g and 1202.72 m~2/g, respectively.