Mechanical Behavior of Functional Hybrid Coating Based on Anisotropic Iron Oxide Nanoparticles
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1007-S15-09
Mechanical behavior of functional hybrid coating based on anisotropic iron oxide nanoparticles Nicolas Chemin1,2, Laurence Rozes2, Corinne Chanéac2, Sophie Cassaignon2, Jean-Pierre Jolivet2, Etienne Barthel3, Eric Le Bourhis4, and Clément Sanchez2 1 Saint-Gobain Recherche, 39 quai Lucien Lefranc, Aubervilliers, 93303, France 2 Laboratoire de la Chimie de la Matière Condensée de Paris, UPMC, Univ Paris 06, UMR 7574, 4 place Jussieu, Tour 54-55, E. 5, Paris, 75252, France 3 Surface du Verre et Interfaces, UMR Saint-Gobain/CNRS, 39 quai Lucien Lefranc, Aubervilliers, 93303, France 4 Laboratoire de Métallurgie Physique, Université de Poitiers, SP2MI, Boulevard Marie et Pierre Curie, Futuroscope Chasseneuil, 86 962, France
ABSTRACT Functional hybrid coatings have been elaborated from a polymer matrix incorporating iron oxide nanoparticles. Stable aqueous suspensions of goethite (α-FeOOH) nanorods, obtained by controlled precipitation of Fe3+ ions, were introduced in 2-hydroxyethyl methacrylate (HEMA). The films were spin-coated on glass substrates from the solutions prior to a UV light induced free radical polymerization step. Nanoindentation tests were carried out to investigate the mechanical properties of the hybrid coatings. Swelling measurements and Fourier Transformed Infrared Spectroscopy (FTIR) were used to characterize the interface between the iron oxide nanoparticles and the PHEMA matrix. Cross-sectional scanning electron microscopy (SEM) and transmission electron microscopy (TEM) was performed to evaluate the dispersion state of the iron oxide particles through the matrix. From a mechanical point of view, iron oxide nanorods yield to a strong reinforcement effect of PHEMA (increase in modulus and hardness by a factor 2 with 5%vol goethite nanoparticles). Origins of such reinforcement are attributed to the existence of highly favourable interactions at the goethite-PHEMA interface combined with a homogeneous dispersion of the particles. The nature of these interactions and evidences of there influence on the mechanical behaviour of the nanohybrid coatings are reported.
INTRODUCTION Organic-inorganic hybrid coatings are widely used in aeronautics, micro-electronic, micro-optic or constructions to protect, design specific properties or improve the surface properties of substrate surface [1,2]. These objectives can be achieved by incorporating particles in polymer coatings. In this context, nanoparticles have attracted much interest. Nanoparticles present at least one dimension in the nanometer range and benefit from a high surface-to-volume ratio which enhances the influence of the surface defects and provides specific properties compared to their bulk counterpart. The properties of nanophase materials depend not only on the individual properties of the components but also on their organisation throughout the composite as well as their interfacial characteristics. When such nanoparticles are homogeneously dispersed in polymer matrices, the resulting nanomaterials benefit from the
specific charac
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