Scintillating aerogels from gels obtained by controlled destabilization of aqueous colloidal solutions : Toward radiometrology
Résumé
The study presented here is focused on a general and versatile approach for the development of inorganic aerogels from aqueous colloidal solutions. In this approach, suspended crystallized nano-objects are used as building blocks allowing access to macroscopic porous structures that are highly crystalline and therefore functional. The starting point of this approach is the preparation of nanoparticles by solvothermal synthesis. After purification, the nanoparticles are in the form of aqueous colloidal solutions, the dry extract of which can exceed 50% by mass. In these colloidal solutions the stability of the particles is ensured by the electrostatic repulsions which exist between the particles whose surface charge is extremely high (zeta potential >> 40 mV). A strong and abrupt change of the dielectric constant of the nanoparticle dispersion solvent induces formation of homogeneous and stable gels The drying of these gels, under supercritical conditions, leads to transparent functional aerogels. By this approach, YAG:Ce scintillating aerogels with good sensitivities under gaseous radionuclides presence were obtained.
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RML abstract SG 2022.pdf (242.11 Ko)
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Poster_RaphaelMarieLuce_SolGel 2022.pdf (1.7 Mo)
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