Journal ArticleDOI
Spontaneous Grafting of Iron Surfaces by Reduction of Aryldiazonium Salts in Acidic or Neutral Aqueous Solution. Application to the Protection of Iron against Corrosion
TLDR
In this article, the surface film of carboxyphenyl groups on iron was chemically derivatized further by octyltriethoxysilane and the anticorrosive effects of different films were evaluated in 0.01 M H2SO4 aqueous solution, by polarization and impedance measurements.Abstract:
The chemical grafting of iron surfaces at open-circuit potential by reduction of different aryldiazonium salts in aqueous acidic solution occurs spontaneously without the need of electrochemical assistance. X-ray photoelectron spectroscopy (XPS) and IR allowed to evidence the grafting of organic moieties without any adsorption of diazonium salts. The aryl groups are strongly bonded to the metal since they can withstand sonication in acetone. XPS measurements also show that spontaneous grafting in water is at least as efficient as electrochemical grafting and also indicate the presence of a multiphenyl layer coverage of the iron surface. The surface film of carboxyphenyl groups on iron was chemically derivatized further by octyltriethoxysilane. The anticorrosive effects of the different films were evaluated in 0.01 M H2SO4 aqueous solution, by polarization and impedance measurements. Grafting of the diazonium salt results in an inhibition efficiency up to 73%, which can be slightly increased up to 85% by d...read more
Citations
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Journal ArticleDOI
Electrografting: a powerful method for surface modification
Daniel Bélanger,Jean Pinson +1 more
TL;DR: This critical review describes the methods that are used for electrografting, their mechanism, the formation and growth of the layers as well as their applications.
Journal ArticleDOI
Aryl diazonium salts: a new class of coupling agents for bonding polymers, biomacromolecules and nanoparticles to surfaces
TL;DR: This critical review summarizes existing knowledge on the use of diazonium salts as a new generation of surface modifiers and coupling agents for binding synthetic polymers, biomacromolecules, and nanoparticles to surfaces.
Journal ArticleDOI
Structural and functional investigation of graphene oxide–Fe3O4 nanocomposites for the heterogeneous Fenton-like reaction
TL;DR: The results showed that formation of two distinct structures was dependent upon the GO loading, and strong interfacial interactions between both components at low GO loading lead to 20% higher degradation of Acid Orange 7 than the Fe3O4 nanoparticles in heterogeneous Fenton-like reaction.
Journal ArticleDOI
Magnetite/graphene nanosheet composites: interfacial interaction and its impact on the durable high-rate performance in lithium-ion batteries
TL;DR: In this article, the interfacial interaction between Fe3O4 and graphene nanosheets is investigated in detail by thermogravimetric and differential scanning calorimetry analysis, Raman spectrum, X-ray photoelectron energy spectrum and Fourier transform infrared spectroscopy.
Journal ArticleDOI
Direct Modification of a Gold Electrode with Aminophenyl Groups by Electrochemical Reduction of in Situ Generated Aminophenyl Monodiazonium Cations
Joël Lyskawa and,Daniel Bélanger +1 more
TL;DR: Aminophenyl groups were electrochemically grafted at the surface of a gold electrode by reduction of in situ generated aminophenyl monodiazonium cations.
References
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Journal ArticleDOI
Covalent Modification of Carbon Surfaces by Aryl Radicals Generated from the Electrochemical Reduction of Diazonium Salts
Philippe Allongue,Michel Delamar,Bernard Desbat,Olivier Fagebaume,Rachid Hitmi,Jean Pinson,Jean-Michel Saveant +6 more
TL;DR: In this paper, the authors used cyclic voltammetry, X-ray photoelectron spectroscopy, polarization modulation IR reflection absorption spectrograms, Auger spectrographic analysis, and Rutherford backscattering spectrographs to estimate the surface coverage of carbon-epoxy composites.
Journal ArticleDOI
Covalent Modification of Carbon Surfaces by Grafting of Functionalized Aryl Radicals Produced from Electrochemical Reduction of Diazonium Salts
Journal ArticleDOI
Electrochemical Modification of Glassy Carbon Electrode Using Aromatic Diazonium Salts. 1. Blocking Effect of 4-Nitrophenyl and 4-Carboxyphenyl Groups
TL;DR: In this article, the effect of a 4-carboxyphenyl or 4-nitrophenyl thin film at the surface of a glassy carbon electrode on their electrochemical responses in the presence of various electroactive probes has been investigated.
Journal ArticleDOI
X-ray photoelectron spectroscopy studies of solvated metal atom dispersed catalysts. Monometallic iron and bimetallic iron-cobalt particles on alumina
Journal ArticleDOI
The inhibition of benzimidazole derivatives on corrosion of iron in 1 M HCl solutions
TL;DR: In this paper, the inhibitive action of some benzimidazole derivatives against the corrosion of iron (99.9999%) in solutions of hydrochloric acid has been studied using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS).
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Attachment of organic layers to conductive or semiconductive surfaces by reduction of diazonium salts
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