Spectroscopic properties of dye-loaded mesoporous silicas of the structural type MCM-41

摘要

Congo Red and Curcumin containing MCM-41 materials have been synthesised andrncharacterized by means of X-ray diffraction, UV-Visible and FTIR spectroscopy. Dyes arernincorporated in the micellar phase of the silica-surfactant mesophase: their spectroscopicrnproperties show that they are in a solvated state, where both surfactant and silica wall may actrnas a solvent. Dyes maintain their pH indicator properties and are accessible to gases such asrnHCl and NH_3.