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Interfacial Activity ofPhosphonated-PEG FunctionalizedCerium Oxide Nanoparticles.

Authors :
Qi, L.
Fresnais, J.
Muller, P.
Theodoly, O.
Berret, J.-F.
Chapel, J.-P.
Source :
Langmuir. Aug2012, Vol. 28 Issue 31, p11448-11456. 9p.
Publication Year :
2012

Abstract

In a recent publication, we have highlighted the potentialof phosphonicacid terminated PEG oligomers to functionalize strong UV absorptioncerium oxide nanoparticles,(1) which yieldsuspensions that are stable in aqueous or organic solvents and areredispersible in different solvents after freeze-drying. In the presentwork, we highlight the interfacial activity of the functional ceriananoparticles and their potential to modify hydrophobic surfaces.We first investigated the phosphonated-PEG amphiphilic oligomers behavioras strong surface active species forming irreversibly adsorbed layers.We then show that the oligomers interfacial properties translate tothe functional nanoparticles. In particular, the addition of a smallfraction of phosphonated-PEG oligomers with an extra C16 aliphaticchain (stickers) into the formulation enabled thetuning of (i) the nanoparticles adsorption at the air/water, polystyrene/water,oil/water interfaces and (ii) the particle/particle interaction inaqueous solutions. We also found that dense and closely packed two-dimensionalmonolayers of nanoceria can be formed by spontaneous adsorption orsurface compression using a Langmuir trough. A hexagonal organizationcontrolled by reversible and repulsive interaction has been characterizedby GISAXS. Mono- or multilayers can also be stably formed or transferredon solid surfaces. Our results are key features in the field of polymersurface modification, solid-stabilized emulsions (Pickering), or supracolloidalassemblies. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
07437463
Volume :
28
Issue :
31
Database :
Academic Search Index
Journal :
Langmuir
Publication Type :
Academic Journal
Accession number :
79194250
Full Text :
https://doi.org/10.1021/la302173g