Experimental Characterization of the NanoparticleSize Effect on the Mechanical Stability of Nanoparticle-Based Coatings.
- Resource Type
- Article
- Authors
- Heni, Wajdi; Vonna, Laurent; Haidara, Hamidou
- Source
- Nano Letters. Jan2015, Vol. 15 Issue 1, p442-449. 8p.
- Subject
- *NANOPARTICLE size
*SURFACE coatings
*STABILITY theory
*SURFACE charges
*MULTILAYERS
*CAVITATION
- Language
- ISSN
- 1530-6984
Wepresent an experimental investigation of the mechanical stabilityof silica nanoparticle-based coatings as a function of the size ofthe nanoparticles. The coatings are built following a layer-by-layerprocedure, alternating positive and negative surface charges. Themechanical stability of the multilayers is studied in water, on thebasis of an ultrasonic cavitation test. The resistance of the coatingto cavitation is found to remarkably increase with decreasing thesize of the nanoparticles, indicating an increase of the cohesiveenergy density. The relative contribution of van der Waals and electricaldouble-layer interactions to the stability of the multilayer is discussedtoward their size dependence. [ABSTRACT FROM AUTHOR]