Composite films of polydopamine-Alcian Blue for colored coating with new physical properties.
Polydopamine (PDA) coatings appear as a universal functionalization methodology allowing to coat the surface of almost all kinds of known materials with a conformal, stable, robust and reactive material. Relatively few investigations were dedicated to the incorporation of other molecules in PDA coatings during their deposition from dopamine solutions under oxidative conditions. Herein we rely on the assumption that the basic building blocks of PDA could be porphyrin like tetramers (as well as higher order oligomers) of 5,6-dihydroxyindole and we investigate the influence of a cationic Cu(II) phtalocyanine, namely Alcian Blue (AB), on the deposition kinetics and on the properties of PDA films. We demonstrate that AB is indeed incorporated in the PDA films to yield a composite PDA-AB coating displaying the optical features of both PDA and AB. The amount of incorporated dye depends on its concentration in solution. The obtained PDA-AB films have a smaller thickness than their related PDA counterparts, a different morphology and a higher permeability to the anionic hexacyanoferrate redox probe. In addition, the incorporation of AB in the films is not homogeneous through their thickness as inferred by means of X-ray photoelectron spectroscopy. The reason for this interesting finding is discussed on the basis of the interactions between AB and PDA as well as on the basis of the structure of PDA films.
Institut National de la Santé et de la Recherche Médicale, Unité Mixte de Recherche, 11 rue Humann, 67085 Strasbourg Cédex, France; Université de Strasbourg, Faculté de Chirurgie Dentaire, 8 rue Sainte Elisabeth, 67000 Strasbourg, France.
Florian
F
Ponzio
Luxembourg Institute of Science and Technology, ZAE Robert Steichen, 5 rue Bommel, L4940 Hautcharage, Luxembourg.
Jérôme
J
Bour
Institut National de la Santé et de la Recherche Médicale, Unité Mixte de Recherche, 11 rue Humann, 67085 Strasbourg Cédex, France; Université de Strasbourg, Faculté de Chirurgie Dentaire, 8 rue Sainte Elisabeth, 67000 Strasbourg, France. Electronic address: vball@unistra.fr.
Vincent
V
Ball
D000423:Alcian Blue / Q000737:chemistry*; D007211:Indoles / Q000737:chemistry*; D008567:Membranes, Artificial; D010084:Oxidation-Reduction; D011108:Polymers / Q000737:chemistry*
D007211:Indoles; D008567:Membranes, Artificial; D011108:Polymers; C568283:polydopamine; D000423:Alcian Blue
Alcian Blue; Composite films; Dopamine; Eumelanins