| Texto completo | |
| Autor(es): |
da Silva, Andre L.
;
Bettini, Jefferson
;
Bernardes, Andre A. .
;
Castro, Ricardo H. R. .
;
Gouvea, Douglas
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Physical Chemistry C; v. N/A, p. 12-pg., 2023-01-12. |
| Resumo | |
Titanium dioxide nanoparticles are of particular interest in photocatalysis and artificial photosynthesis studies. Their properties are dependent on parameters such as the crystal polymorph, for example, anatase/rutile phases, the specific surface area, and the capacity to adsorb CO2 and H2O gas molecules. A cause-effect relationship exists between those parameters, the surface thermochem-istry, and the performance in application. Howe v e r , the lack of systematic thermodynamic data has hindered a more comprehensive understanding to enable control. This work investigates the relation-ship between the surface thermochemistry of alkaline earth metals doped TiO2 and the associated micro and nanostructural features. TiO2 nanoparticles doped with Mg2+, Ca2+, Sr2+ , or Ba2+ showed spontaneous segregation of dopants to the nanoparticles' interfaces, leading to incremental surface energy reduction as directly measured by microcalorimetry of adsorption. The phenomenon was a direct function of ionic radius and led to the improved thermal stability of the nanoparticles against coarsening , stabilizing the anatase polymorph, and increasing the specific surface area. (AU) | |
| Processo FAPESP: | 22/04150-6 - Estudo de nanocerâmicas para aplicação em energia: sinterização e interfaces |
| Beneficiário: | Flavio Leandro de Souza |
| Modalidade de apoio: | Auxílio à Pesquisa - Pesquisador Visitante - Internacional |
| Processo FAPESP: | 20/15230-5 - Centro de Pesquisa e Inovação de Gases de Efeito Estufa - RCG2I |
| Beneficiário: | Julio Romano Meneghini |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia |
| Processo FAPESP: | 14/50279-4 - Brasil Research Centre for Gas Innovation |
| Beneficiário: | Julio Romano Meneghini |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia |