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Issue 41, 2018
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Surface modification of CoCr alloys by electrochemical reduction of diazonium salts

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Abstract

Tailoring the surface chemistry of CoCr alloys is of tremendous interest in many biomedical applications. In this work, we show that CoCr can be modified by diazonium electrografting provided the surface is not homogeneously covered with an oxide layer. Cyclic voltammetry (CV) and X-ray photoelectron spectroscopy (XPS) show the electrografting of a poly(aminophenylene) (PAP) layer on CoCr when treated at a reductive potential (CoCr−0.5 V), whereas no PAP film was formed on CoCrOCP and CoCr1 V, treated at open circuit and anodic potentials respectively. Based on XPS results, we attributed the electrografting to the formation of carbide bonds between PAP and the inhomogeneous thin oxide layer of CoCr−0.5 V. We then show an example of application of PAP coatings on CoCr and prove that the presence of a PAP coating on CoCr−0.5 V results in a 5-fold increase of the adherence of poly methyl methacrylate (PMMA) to PAP-coated CoCr compared to uncoated samples; this is of prime significance to improving the long-term stability of dental prostheses. These findings support the importance of reducing the oxide layer for effective functionalization of metal oxides with aryl diazonium salts and suggest a promising surface modification approach for biomedical applications.

Graphical abstract: Surface modification of CoCr alloys by electrochemical reduction of diazonium salts

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Publication details

The article was received on 27 Mar 2018, accepted on 05 Apr 2018 and first published on 02 Jul 2018


Article type: Paper
DOI: 10.1039/C8RA02634C
Citation: RSC Adv., 2018,8, 23191-23198
  • Open access: Creative Commons BY-NC license
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    Surface modification of CoCr alloys by electrochemical reduction of diazonium salts

    M. A. Mezour, Y. Oweis, A. A. El-Hadad, S. Algizani, F. Tamimi and M. Cerruti, RSC Adv., 2018, 8, 23191
    DOI: 10.1039/C8RA02634C

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