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Ceria Nanotube Formed by Sacrificed Precursors Template through Oswald Ripening.

Pang L, Wang X, Tang X - PLoS ONE (2015)

Bottom Line: Controllable preparation of ceria nanotube was realized by hydrothermal treatment of Ce(OH)CO3 precursors.The gradually changing morphologies and microstructures of cerium oxide were characterized by X-ray powder diffraction, scanning electron microscopy and transmission electron microscopy.On the basis of the time-dependent experimental observation, the possible formation mechanism related to oriented attachment and Oswald ripening was proposed, which might afford some guidance for the synthesis of other inorganic nanotubes.

View Article: PubMed Central - PubMed

Affiliation: School of Material Science and Engineering, Shandong Jiaotong University, Jinan, P.R China.

ABSTRACT
Controllable preparation of ceria nanotube was realized by hydrothermal treatment of Ce(OH)CO3 precursors. The gradually changing morphologies and microstructures of cerium oxide were characterized by X-ray powder diffraction, scanning electron microscopy and transmission electron microscopy. A top-down path is illuminated to have an insight to the morphological transformation from nanorod to nanotube by adjusting the reaction time. The growth process is investigated by preparing a series of intermediate morphologies during the shape evolution of CeO2 nanostructure based on the scanning electron microscopy image observation. On the basis of the time-dependent experimental observation, the possible formation mechanism related to oriented attachment and Oswald ripening was proposed, which might afford some guidance for the synthesis of other inorganic nanotubes.

No MeSH data available.


Related in: MedlinePlus

A schematic diagram showing growth mechanism of CeO2 nanotubes.
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pone.0132536.g005: A schematic diagram showing growth mechanism of CeO2 nanotubes.

Mentions: Based on the experimental observations, a possible formation mechanism of CeO2 nanotubes is proposed and displayed in Fig 5. At the early stages, the initial nanoparticles are expected to randomly aggregate to reduce the surface energy (Fig 5a). Along with the reaction proceeding, the Ostwald ripening is dominant, and the small, less crystalline particles in a colloidal aggregate dissolved gradually, while larger, better crystallized particles in the same aggregate grew (Fig 5b). Meanwhile, this process involves spontaneous self-organization of adjacent particles so that they share a common crystallographic orientation, followed by the joining of these particles at a planar interface (Fig 5c). At last, the Ostwald ripening is completed with “solid-solution-solid” mass transportation. Crystallites located in the outermost surface ofaggregates are larger and would grow at the expense of smallerones inside, so the solid evacuation occurred. As a result, the CeO2 nanotube was formed (Fig 5d). CeO2nanostructure with hollow interior space maybe a good CO conversion support owe to its high surface area, which is believed to widely used in catalytic systems.


Ceria Nanotube Formed by Sacrificed Precursors Template through Oswald Ripening.

Pang L, Wang X, Tang X - PLoS ONE (2015)

A schematic diagram showing growth mechanism of CeO2 nanotubes.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4494707&req=5

pone.0132536.g005: A schematic diagram showing growth mechanism of CeO2 nanotubes.
Mentions: Based on the experimental observations, a possible formation mechanism of CeO2 nanotubes is proposed and displayed in Fig 5. At the early stages, the initial nanoparticles are expected to randomly aggregate to reduce the surface energy (Fig 5a). Along with the reaction proceeding, the Ostwald ripening is dominant, and the small, less crystalline particles in a colloidal aggregate dissolved gradually, while larger, better crystallized particles in the same aggregate grew (Fig 5b). Meanwhile, this process involves spontaneous self-organization of adjacent particles so that they share a common crystallographic orientation, followed by the joining of these particles at a planar interface (Fig 5c). At last, the Ostwald ripening is completed with “solid-solution-solid” mass transportation. Crystallites located in the outermost surface ofaggregates are larger and would grow at the expense of smallerones inside, so the solid evacuation occurred. As a result, the CeO2 nanotube was formed (Fig 5d). CeO2nanostructure with hollow interior space maybe a good CO conversion support owe to its high surface area, which is believed to widely used in catalytic systems.

Bottom Line: Controllable preparation of ceria nanotube was realized by hydrothermal treatment of Ce(OH)CO3 precursors.The gradually changing morphologies and microstructures of cerium oxide were characterized by X-ray powder diffraction, scanning electron microscopy and transmission electron microscopy.On the basis of the time-dependent experimental observation, the possible formation mechanism related to oriented attachment and Oswald ripening was proposed, which might afford some guidance for the synthesis of other inorganic nanotubes.

View Article: PubMed Central - PubMed

Affiliation: School of Material Science and Engineering, Shandong Jiaotong University, Jinan, P.R China.

ABSTRACT
Controllable preparation of ceria nanotube was realized by hydrothermal treatment of Ce(OH)CO3 precursors. The gradually changing morphologies and microstructures of cerium oxide were characterized by X-ray powder diffraction, scanning electron microscopy and transmission electron microscopy. A top-down path is illuminated to have an insight to the morphological transformation from nanorod to nanotube by adjusting the reaction time. The growth process is investigated by preparing a series of intermediate morphologies during the shape evolution of CeO2 nanostructure based on the scanning electron microscopy image observation. On the basis of the time-dependent experimental observation, the possible formation mechanism related to oriented attachment and Oswald ripening was proposed, which might afford some guidance for the synthesis of other inorganic nanotubes.

No MeSH data available.


Related in: MedlinePlus