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Deposition Kinetics of Bioinspired Phenolic Coatings on Titanium Surfaces

Journal article
Authors Sebastian Geißler
Alejandro Barrantes
Pentti Tengvall
Phillip B. Messersmith
Hanna Tiainen
Published in Langmuir
Volume 32
Issue 32
Pages 8050-8060
ISSN 0743-7463
Publication year 2016
Published at Institute of Clinical Sciences, Section for Anesthesiology, Biomaterials and Orthopaedics, Department of Biomaterials
Pages 8050-8060
Language en
Links dx.doi.org/10.1021/acs.langmuir.6b0...
Subject categories Medical Engineering, Medical Biotechnology

Abstract

Polyphenols can form functional coatings on a variety of different materials through auto-oxidative surface polymerization in a manner similar to polydopamine coatings. However, the mechanisms behind the coating deposition are poorly understood. We report the coating deposition kinetics of the polyphenol tannic acid (TA) and the simple phenolic compound pyrogallol (PG) on titanium surfaces. The coating deposition was followed in real time over a period of 24 h using a quartz crystal microbalance with dissipation monitoring (QCM-D). TA coatings revealed a multiphasic layer formation: the deposition of an initial rigid layer was followed by the buildup of an increasingly dissipative layer, before mass adsorption stopped after approximately 5 h of coating time. The PG deposition was biphasic, starting with the adsorption of a nonrigid viscoelastic layer which was followed by layer stiffening upon further mass adsorption. Coating evaluation by ellipsometry and AFM confirmed the deposition kinetics determined by QCM-D and revealed maximum coating thicknesses of approximately 50 and 75 nm for TA and PG, respectively. Chemical characterization of the coatings and polymerized polyphenol particles indicated the involvement of both physical and chemical interactions in the auto-oxidation reactions.

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