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| Naji, M. |
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Lu, Ping
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Topics
Publications (6/6 displayed)
- 2022Quality Control Metrics to Assess MoS2 Sputtered Films for Tribological Applicationscitations
- 2021Thermal Stability and Radiation Tolerance of Lanthanide-Doped Cerium Oxide Nanocubescitations
- 2020Evidence of Inverse Hall-Petch Behavior and Low Friction and Wear in High Entropy Alloyscitations
- 20193D strain-induced superconductivity in La2CuO4+δ using a simple vertically aligned nanocomposite approach.
- 20193D strain-induced superconductivity in La2CuO4+δ using a simple vertically aligned nanocomposite approachcitations
- 2018Achieving Ultralow Wear with Stable Nanocrystalline Metalscitations
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article
Thermal Stability and Radiation Tolerance of Lanthanide-Doped Cerium Oxide Nanocubes
Abstract
<jats:p>The thermal and radiation stability of free-standing ceramic nanoparticles that are under consideration as potential fillers for the improved thermal and radiation stability of polymeric matrices were investigated by a set of transmission electron microscopy (TEM) studies. A series of lanthanide-doped ceria (Ln:CeOx; Ln = Nd, Er, Eu, Lu) nanocubes/nanoparticles was characterized as synthesized prior to inclusion into the polymers. The Ln:CeOx were synthesized from different solution precipitation (oleylamine (ON), hexamethylenetetramine (HMTA) and solvothermal (t-butylamine (TBA)) routes. The dopants were selected to explore the impact that the cation has on the final properties of the resultant nanoparticles. The baseline CeOx and the subsequent Ln:CeOx particles were isolated as: (i) ON-Ce (not applicable), Nd (34.2 nm), Er (27.8 nm), Eu (42.4 nm), and Lu (287.4 nm); (ii) HMTA-Ce (5.8 nm), Nd (6.6 nm), Er (370.0 nm), Eu (340.6 nm), and Lu (287.4 nm); and (iii) TBA-Ce (4.1 nm), Nd (5.0 nm), Er (3.8 nm), Eu (7.3 nm), and Lu (3.8 nm). The resulting Ln:CeOx nanomaterials were characterized using a variety of analytical tools, including: X-ray fluorescence (XRF), powder X-ray diffraction (pXRD), TEM with selected area electron diffraction (SAED), and energy dispersive X-ray spectroscopy (EDS) for nanoscale elemental mapping. From these samples, the Eu:CeOx (ON, HMTA, and TBA) series were selected for stability studies due to the uniformity of the nanocubes. Through the focus on the nanoparticle properties, the thermal and radiation stability of these nanocubes were determined through in situ TEM heating and ex situ TEM irradiation. These results were coupled with data analysis to calculate the changes in size and aerial density. The particles were generally found to exhibit strong thermal stability but underwent amorphization as a result of heavy ion irradiation at high fluences.</jats:p>