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An unexpected phase transformation of ceria nanoparticles in aqueous media.
Kuchibhatla, Satyanarayana V N T; Karakoti, Ajay S; Vasdekis, Andreas E; Windisch, Charles F; Seal, Sudipta; Thevuthasan, S; Baer, Donald R.
Afiliación
  • Kuchibhatla SVNT; Environmental and Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA-99354, USA.
  • Karakoti AS; School of Engineering and Applied Science, Division of Biological and Life Sciences, School of Arts and Sciences, Ahmedabad University, Ahmedabad, Gujarat - 380009, India.
  • Vasdekis AE; Environmental and Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA-99354, USA.
  • Windisch CF; FCSD, Pacific Northwest National Laboratory, Richland, WA-99354, USA.
  • Seal S; Nanoscience and Technology Center, Advanced Materials Processing and Analysis Center, University of Central Florida, Orlando, Florida - 32816.
  • Thevuthasan S; Environmental and Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA-99354, USA.
  • Baer DR; Environmental and Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA-99354, USA.
J Mater Res ; 34(3): 465-473, 2019 Feb.
Article en En | MEDLINE | ID: mdl-33776202
Cerium oxide Nanoparticles (CNPs) are of significant interest to the scientific community due to their wide spread applications in a variety of fields. It is proposed that size dependent variations in the extent of Ce3+ and Ce4+ oxidation states of cerium in CNPs determines the performance of CNPs in application environments. To obtain greater molecular and structural understanding of chemical state transformations previously reported for ceria ≈ 3 nm nanoparticles (CNPs) in response to changing ambient conditions, microXRD and Raman measurements were carried out for various solution conditions. The particles were observed to undergo a reversible transformation from a defective ceria structure to a non-ceria amorphous oxy-hydroxide/peroxide phase in response to the addition of 30% hydrogen peroxide. For CNPs made up of ~8 nm crystallites, a partial transformation was observed and no transformation was observed for CNPs made up of ~ 40 nm crystallites. This observation of differences in size dependent transition behavior may help explain the benefits of using smaller CNPs in applications requiring regenerative behavior.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Mater Res Año: 2019 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Mater Res Año: 2019 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos