ADSORPTION OF DYES ON NANOSIZE MODIFIED SILICA PARTICLES

The adsorption of several anionic dyes on nanosize alumina-modified si lica particles of different compositions and modal sizes has been stud ied, These silica cores have the same surface properties as alumina di spersed in aqueous solutions. The negatively charged dyes are electros tatically attracted to positively charged cores and chemisorbed by for ming a surface Al lake. The application of so obtained pigments in the preparation of color films and their optical characteristics are desc ribed. (C) 1997 Academic Press.