Commissariat a L'energie Atomique

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Jorice Samuel

Olivier Raccurt

Olivier Jean Poncelet

Olivier Renard

Marinella Mazzanti

Daniel Imbert

The present invention relates to a silica particle comprising at least one complex of at least one lanthanide and of at least one ligand of formula (A) 

Silica particle comprising an organolanthanide compound, preparation process therefor and uses thereof

A composition including: a dispersion of particles of at least one oxide of at least one luminescent rare earth, disaggregated and stabilized in a hydrophobic liquid medium to which at least one surfactant is added, in which said surfactant is a non-ionic surfactant having an HLB (hydrophilic-to-lipophilic balance) lower than 12.

Dispersions of luminescent rare-earth oxide particles, varnish comprising these particles, their methods of preparation and method for marking substrates

In the invention, use is made of at least one metal organosilicate polymer, in the form of particles, having one of the following formulae I and II:RSiAlO(OH),&#x2003;&#x2003;Formula I:RSiMO(OH),&#x2003;&#x2003;Formula II:for the protection from oxidation and/or electromagnetic radiation of a compound sensitive to oxidation and/or to electromagnetic radiation. The invention finds application in particular in the field of the protection from oxidation and photoaging of various materials.

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Annecy, France

Jorice Samuel