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Accueil > Séminaires > Archive des séminaires d’Utinam > 2019

Begoña Ferrari

Tailoring of the stabilizer adsorption on nanoparticles surfaces for the nanostructured growth of ceramic coatings in 3D structures

vendredi 17 mai 2019, 10h30

salle de conférences de l’observatoire

Begoña FERRARI

Instituto de Cerámica y Vidrio, CSIC - Consejo Superior de Investigaciones Científicas, Espagne

Résumé :

Among coating processes, the Electrophoretic Deposition (EPD) have been considered as the most suitable technique for the coverage of complex shapes and macroporous substrates (i.e. scaffolds and foams) [1] [2] [3]. It also shows remarkable features comparing with other colloidal techniques, since it allows coating 3D substrates using low concentrated suspension of nanoparticles (NPs), lowering rheology requirements, for growth either porous and dense nanostructured films. Moreover EPD allows producing customized products and reproducing the properties achieved coating 2D substrates in the 3D structures, saving cost in raw materials, as well as reducing process steps following rules of the Green Chemistry.
Understanding the colloidal behavior of NPs is mandatory to prepare stable and disperse suspensions suitable for colloidal coating methods. In electrostatically stabilized suspensions, the morphology, the crystallography and the reactivity of the NPs, determine the charge distribution, while the ionic strength modulates the charge, determining NPs assembly during evaporation. But also, the surface modifiers and suspensions additives are effective tools to manage NPs flocculation and hence ordering. In this work, we will discuss how the Layer-by-Layer (LbL) technology, understood as the alternate absorption of cationic and anionic polymers onto the particle surface, and the control of the polyelectrolyte ionization as well as the suspension ionic strength determines NPs assembly in 3D ceramic coatings by EPD, and hence their properties [4] [5].

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