title: Experimental characterization of the nanoparticle size effect on the mechanical stability of nanoparticle-based coatings.
abstract: We present an experimental investigation of the mechanical stability of silica nanoparticle-based coatings as a function of the size of the nanoparticles. The coatings are built following a layer-by-layer procedure, alternating positive and negative surface charges. The mechanical stability of the multilayers is studied in water, on the basis of an ultrasonic cavitation test. The resistance of the coating to cavitation is found to remarkably increase with decreasing the size of the nanoparticles, indicating an increase of the cohesive energy density. The relative contribution of van der Waals and electrical double-layer interactions to the stability of the multilayer is discussed toward their size dependence.
authors.affiliation: Institut de Science des Matériaux de Mulhouse (IS2M) CNRS-UMR 7361, Université de Haute Alsace , 15 rue Jean Starcky BP2488, 68057 Mulhouse Cedex, France.
authors.forename: Wajdi
authors.initials: W
authors.lastname: Heni
authors.forename: Laurent
authors.initials: L
authors.lastname: Vonna
authors.forename: Hamidou
authors.initials: H
authors.lastname: Haidara
keywords: Nanoparticle; cavitation; cohesion energy density; nanoparticle assembly; nanoparticle-based coating; ultrasonic cavitation test