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2016-06-24 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

Nicolay Arnaud, Poelman Mireille , Ruelle Benoît , Dubois Philippe , Olivier Marie-Georges , "Elaboration of multifunctional coatings based on an aqueous sol-gel nanofilled with nanoparticles" in 10th international symposium on Electrochemical Impedance Spectroscopy, A Toxa, Spain, 2016

  • Codes CREF : Matériaux composites (DI2726)
  • Unités de recherche UMONS : Matériaux Polymères et Composites (S816), Science des Matériaux (F502)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Centre d’Innovation et de Recherche en Matériaux Polymères (CIRMAP), Ingénierie des matériaux (CRIM)
Texte intégral :

Abstract(s) :

(Anglais) Stainless steel is widely used in applications as hospital furniture, banisters and household applications. These surfaces are subject to ambience (humidity) and mechanical factors (scratches, abrasion). Recently, the design and synthesis of new polymer matrix/inorganic filler nanocomposite materials have been extensively studied in order to combine the properties of mineral (nano)fillers and polymer matrices. Thanks to their nature and properties, nanoparticles (NPs) such as alumina, zirconia appear to be interesting candidates for the elaboration of coating with enhanced mechanical properties. The sol-gel process constitutes one of the easiest ways to develop modified materials (materials with the required properties depending on their composition). The sol-gel materials are distinguished by durability and stability, and many of them are optically transparent. It also provides better corrosion resistance to metal substrates. Currently, silica-based sol-gel materials are the most widespread. The present study aims at investigating the elaboration of a new type of NPs/sol-gel nanocomposite coatings which can improve mechanical properties while maintaining barrier performance of stainless steel. The sol-gel is an inorganic-organic hybrid based on a mixture of three alkoxysilane synthesized in purely aqueous phase which allows responding to environmental constraints. Electrochemical impedance spectroscopy was used to characterize the homogeneity of coatings and their barrier properties throughout the optimization of synthesis of aqueous sol-gel coating. The thickness, the composition but also the presence of a wetting agent play an important role on the barrier properties of the aqueous sol-gel. The dispersion of NPs will be also presented.