Dyeing of Anodic Porous Alumina Using a Micellar Solution of Sodium Dodecyl Sulfate

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Anodic porous alumina (APA) prepared in sulfuric acid solution was dyed by immersing in N,N-dimethylformamide (DMF) or in an aqueous micellar anionic surfactant solution of sodium dodecyl sulfate (SDS) containing the following molecules: tris(8-quinolinolato)aluminum, tris(dibenzoylmethane)mono(1,10-phenanthroline)europium(III), and pyrene. Absorbance increased with dye concentration in all cases, except for pyrene in DMF. Interestingly, the absorbance of adsorbed dyes on the APA surface immersed in SDS micellar solutions was larger than that for dyes immersed in DMF solution. These results suggested that the increased adsorption amount is attributed to the electrostatic interactions between the positive charge of the APA surface and the negative charge of SDS micelles solubilizing dye molecules inside the micelles.