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Author (up) Sekar, S.; Giermanska, J.; Saadaoui, H.; Chapel, J.P. openurl 
  Title Fine-tuning the assembly of highly stable oppositely charged cerium oxide nanoparticles in solution and at interfaces Type Journal Article
  Year 2016 Publication Colloids And Surfaces A-Physicochemical And Engineering Aspects Abbreviated Journal Colloid Surf. A-Physicochem. Eng. Asp.  
  Volume 500 Issue Pages 98-104  
  Keywords Cerium oxide nanoparticles; Desalting transition; Surface grown layer; Layer-by-layer; Ionic strength; Polyelectrolytes; Polyethyleneimine (PEI); Polyacrylic acid (PAA); Electrostatic assembly  
  Abstract In this work we have shown how to fine-tune the electrostatic assembly of oppositely charged cerium oxide nanoparticles (NPs) in a solution and at a solid/liquid interface. In a first stage, we have developed anionic and cationic CeO2 NPs stable in a highly saline environment and a wide pH range via efficient electro-steric interactions. Anionic NPs were obtained by coating bare NPs with short polyacrylic acid (PAA) chains through a Precipitation-Redispersion method. Whereas cationic NPs were formulated by tethering branched polyethyleneimine ( bPEI) chains onto PAA-coated ceria NPs through the formation of amide bonds with the help of imide cross-linkers. The covalent attachment of bPEI chains was evidenced through NMR characterizations while thermogravimetric (TGA), dynamic light scattering (DLS) and zeta potential measurements confirmed the successful encapsulation by both types of weak polyelectrolytes. In a second stage, the high stability of both NP dispersions toward high ionic strength (up to 4 M NH4Cl) enabled to generate hybrid clusters in a controlled way by fine tuning their co-assembly following a desalting transition route monitored by DLS. In a last part, we have extended our approach to surfaces and generated all-nanoparticle layer grown directly from a liquid/solid interface monitored by Quartz Crystal Microbalance (QCM). Such thin nano-clustered layer with tunable and relatively high volume fraction of ceria NPs represents a promising platform to impart functional coatings onto metal, ceramic and polymer substrates. (C) 2016 Elsevier B.V. All rights reserved.  
  Address [Sekar, Sribharani; Giermanska, Joanna; Saadaoui, Hassan; Chapel, Jean-Paul] CNRS, Ctr Rech Paul Pascal, UPR 8641, F-33600 Pessac, France, Email:  
  Corporate Author Thesis  
  Publisher Elsevier Science Bv Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0927-7757 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000375860100012 Approved no  
  Call Number Admin @ benzerara @ Serial 14031  
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