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<dcterms:abstract xml:lang="en">The iron oxide and silica nanoparticles found today many applications in different fields thanks to the magnetic properties, their specific surface area and their biocompatibility. This thesis project involves research on the capture of metals or molecules in different situations. The common thread of these projects is the improvement of treatments which seek to extract certain elements (metals or molecules) which cannot be evacuated naturally and which continue in circulation: excess iron for the treatment of hemochromatosis, excess of sodium and phosphates for the improvement of peritoneal dialysis, as well as many perspectives of environmental depollution and uptake of polycyclic aromatic hydrocarbons (PAH), a family of endocrine disruptors.</dcterms:abstract>
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