Molecular approach for the syntesis of doped and/or hybrid titania nanoparticles via a sol gel process : applications in medical imaging and oxidation catalysis
type: Dataset
description: A new and relevant sol-gel process has allowed us to prepare new hybrid materials. Titania nanoparticles with lanthanides doping agent (gadolinium and europium) were obtained as anatase nanocrystallites via our low-temperature process. Their magnetic and luminescent properties have been tested in order to use them as contrast agent in medical imaging. A doped and hybrid material has also been obtained and its NH2 groups at the surface will be used in thebio-medical field. The second part of this work has consisted in the preparation of TiO2(citrate) hybrid supports viaa new titanium alkoxide that contains a citrate ligand. Several surface citrate density had been obtained by changing the precursor’s initial relative amounts. Then the simple contact between these hybrid supports and aqueous solutions of silver or gold ions led to the formation of metallic particles directly on the surface support thanks to the presence of the citrate groups, which are known to be reducing agent. These M/TiO2 materials were then tested as catalysts in the aerobic epoxidation of trans-stilbene in the liquid phase. Through this study, we were able to improve our knowledge in this reactionmechanism.
identifier: NNT: 2010LYO10003
issued: 2026-05-11T12:38:03.424346
language: fr
modified: 2026-05-11T12:38:03.424352
contact point: Organization
  fn: CCSD
keyword: argent
keyword: catalyse
keyword: catalysis
keyword: chimothechemical-sciencesother
keyword: dopage-lanthanide
keyword: gold
keyword: hybrid
keyword: hybrides
keyword: infoeu-reposemanticsdoctoralthesis
keyword: lanthanide-doping-agent
keyword: liquid-phase-oxidation
keyword: nanoparticles
keyword: nanoparticules
keyword: or
keyword: oxydation-en-phase-liquide
keyword: procede-sol-gel
keyword: silver
keyword: sol-gel-process
keyword: theses
keyword: tio2
keyword: titania
landing page: https://theses.hal.science/tel-00812752

Molecular approach for the syntesis of doped and/or hybrid titania nanoparticles via a sol gel process : applications in medical imaging and oxidation catalysis
type: Distribution
format: HTML
issued: 2026-05-11T12:38:03.473366
modified: 2026-05-11T12:38:03.382706
access URL: https://theses.hal.science/tel-00812752

test_moissonnage_selune
type: Agent