Abstract
Carminic acid was adsorbed into amorphous silicas prepared by the sol−gel process. While cromophore is gradually released in silica when put in contact with water, irreversible adsorption takes place when silica is doped with aluminum. The role of aluminum on effective retention of carminic acid by aluminic silicas is described. A fractal geometry approach was employed to describe changes in silica samples when they are doped with aluminum and when chromophore is incorporated. Inclusion of chromophore provokes aggregates to form interconnected fractal surfaces.
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