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Title

Importance of complexation processes on the fate, reactivity and transport of manufactured nanoparticles in aquatic systems

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Defense Thèse de doctorat : Univ. Genève, 2015 - Sc. 4811 - 2015/07/15
Abstract The rapid development of nanotechnology and the increased use of engineered nanoparticles (ENPs) in consumer products will result in the occurrence of nanomaterials in the environment. The present thesis (compilation of publications) is dealing with the investigation of ENP stability, fate and impact in aquatic systems. Influence of important water physico-chemical properties (pH, ionic strength, divalent electrolytes) but also the presence of natural organic matter (NOM) and surfactants on the stability of TiO2 ENPs has been systematically studied. A special interest was given to the stability of already formed ENP agglomerates. Presence of NOM, at environmental concentrations, was shown to promote significant disagglomeration which is a key result for the risk assessment associated to ENPs. Interactions mechanisms between ENPs and NOM were also investigated by calorimetry for the first time in environmental nanoscience and opened a new insight into the understanding of ENP behavior in presence of NOM.
Keywords Engineered nanoparticlesNatural organic matterNanoparticle stabilityAgglomerationDisagglomerationTiO2Humic acidsPolysaccharidesAlginateSurfactantsSDSLatexDLSTEMSEMITC
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URN: urn:nbn:ch:unige-748565
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Thesis (42.9 MB) - public document Free access
Structures
Research group Environmental Physical Chemistry
Projects FNS: 200010_152647
FNS: 200021_13240
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(ISO format)
LOOSLI, Frédéric. Importance of complexation processes on the fate, reactivity and transport of manufactured nanoparticles in aquatic systems. Université de Genève. Thèse, 2015. https://archive-ouverte.unige.ch/unige:74856

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Deposited on : 2015-08-26

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