Artículo
Hierarchical, template-free self-assembly morphologies in CeO2 synthesized via urea-hydrothermal method
Suarez Anzorena, María del Rosario
; Muñoz, Fernando Francisco
; Bonelli, Pablo Ricardo
; Cukierman, Ana Lea
; Larrondo, Susana Adelina
Fecha de publicación:
06/2020
Editorial:
Elsevier
Revista:
Ceramics International
ISSN:
0272-8842
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Nano-crystalline CeO2 was synthesized via the urea-hydrothermal method without templates or structure-directing agents. The synthesis parameters Ce3+ to Ce4+ and urea to cation molar ratios, reaction temperature and reaction time were varied to analyze their effect on morphology, texture and reducibility. The analysis of the obtained morphologies provides strong evidence of a hierarchical and sequential template-free self-assembly process that evolves from shuttles to dumbbells to spheres. In all cases, the morphology of samples remains unchanged even after calcination at 500 °C. The presence of Ce4+ in the initial solution clearly provides the full self-assembly sequence and is decisive for obtaining non-hollow spheres of CeO2 with high specific surface area and high pore volume. Besides, if only Ce3+ is present, typical CeOHCO3 shuttle-like particles with orthorhombic structure are obtained. The use of Ce3+ in combination with Ce4+ produces partial sequences of the self-assembly process that provide a strong indication of the hierarchical sequence. The urea to cation molar ratio controls the nucleation process and proves to be crucial to obtain the self-assembly sequence. On the other hand, temperature and reaction time show a moderate effect on morphology.
Palabras clave:
CERIA
,
HYDROTHERMAL SYNTHESIS
,
SELF-ASSEMBLY MORPHOLOGIES
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Colecciones
Articulos(ITAPROQ)
Articulos de INSTITUTO DE TECNOLOGIA DE ALIMENTOS Y PROCESOS QUIMICOS
Articulos de INSTITUTO DE TECNOLOGIA DE ALIMENTOS Y PROCESOS QUIMICOS
Articulos(UNIDEF)
Articulos de UNIDAD DE INVESTIGACION Y DESARROLLO ESTRATEGICOS PARA LA DEFENSA
Articulos de UNIDAD DE INVESTIGACION Y DESARROLLO ESTRATEGICOS PARA LA DEFENSA
Citación
Suarez Anzorena, María del Rosario; Muñoz, Fernando Francisco; Bonelli, Pablo Ricardo; Cukierman, Ana Lea; Larrondo, Susana Adelina; Hierarchical, template-free self-assembly morphologies in CeO2 synthesized via urea-hydrothermal method; Elsevier; Ceramics International; 46; 8; 6-2020; 11776-11785
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