Surface modification of inorganic oxide particles with silane coupling agent and organic dyes

The silane coupling agent 3-glycidoxypropyl trimethoxylsilane (GPS) was gra fted onto the surface of silica gel, PZ glass beads and TiO2 oxide particle s. FT-IR, thermogravimetric and elemental analysis were used to characteriz e the modified particles. The effects of various factors on the GPS graftin g efficiency such as catalyst, GPS concentration, reaction temperature and time were studied. After modification with GPS, the xanthene dye rhodamine B and azo dyes 4-phenylazophenol and 4-phenylazoaniline, respectively, were grafted on to the particles, which were then used as pigment piers The col ors of the pigments were adjusted by changing the kind of dyes, the concent ration, the pH and the reaction solvents. Copyright (C) 2001 John Wiley & S ons, Ltd.