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An unexpected phase transformation of ceria nanoparticles in aqueous media

Published online by Cambridge University Press:  08 February 2019

Satyanarayana V.N.T. Kuchibhatla
Environmental and Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, USA
Ajay S. Karakoti
School of Engineering and Applied Science, Division of Biological and Life Sciences, School of Arts and Sciences, Ahmedabad University, Ahmedabad, Gujarat 380009, India
Andreas E. Vasdekis
Environmental and Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, USA
Charles F. Windisch Jr.
FCSD, Pacific Northwest National Laboratory, Richland, Washington 99354, USA
Sudipta Seal
Nanoscience and Technology Center, Advanced Materials Processing and Analysis Center, Department of Materials Science and Engineering and College of Medicine, University of Central Florida, Orlando, Florida 32816, USA
Suntharampillai Thevuthasan
Environmental and Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, USA
Donald R. Baer
Environmental and Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, USA
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Cerium oxide nanoparticles (CNPs) are of significant interest to the scientific community due to their widespread 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 determine the performance of CNPs in application environments. To obtain greater molecular and structural understanding of chemical state transformations previously reported for ceria of ≈3 nm nanoparticles (CNPs) in response to changing ambient conditions, micro-XRD 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 oxyhydroxide/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 property.

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Copyright © Materials Research Society 2019 

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Current address: Parisodhana Technologies Pvt., Ltd., Hyderabad, Telangana 500074, India.


Current address: Department of Physics, University of Idaho, Moscow, ID 83844, USA.


Current address: Columbia Basin College, Pasco, WA 99301, USA.


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