Properties of nanoceria particles: Comparison among thermal and microwave mediated synthesis

Kurian, Manju; Joys, Minu

doi:10.1063/5.0017550

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…Under air, the reaction mixture remained brown throughout and after the synthesis (see Figure S7 for photographs). Reports in the literature suggest that a colorless or yellow solution is indicative of a Ce(OH) 3 or Ce 2 O 3 composition, purple suggests a mixed-valence phase, and brown is consistent with a Ce(III)-rich CeO 2– x material. − Our observations regarding the color changes observed, as well as the XPS and XRD data, are consistent with these literature reports. The XPS data suggest that the nanoribbons are predominantly a Ce(III) phase, likely a mixture of bixbyite Ce 2 O 3 and fluorite CeO 2 based upon the XRD data.…”

Section: Resultssupporting

confidence: 91%

Reaction Atmospheres and Surface Ligation Control Surface Reactivity and Morphology of Cerium Oxide Nanocrystals during Continuous Addition Synthesis

Knecht

Hutchison

2022

Inorg. Chem.

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Cerium oxide nanocrystals have size-and shape-dependent properties that are potentially useful in a variety of applications if these structural attributes can be controlled through synthesis. Various syntheses have been developed in attempts to access different sizes and shapes, but little is known about selecting reaction conditions to predictably control the growth, and therefore properties, of the nanocrystals. Here, we investigate the role of cerium precursor oxidation states, reaction atmospheres, and acetic acid ligation on the size and shape of cerium oxide nanocrystals. A continuous addition synthesis allowed us to vary individual reaction parameters to better understand how each affects growth and morphology. Under N 2 , the synthesis leads to either irregular shapes or nanoribbons, whereas the same synthesis under air leads to size-tunable nanocubes. To determine whether air might be oxidizing the cerium precursor and changing its reactivity, we synthesized Ce(IV)-rich and Ce(III) oleate precursors and found that the oxidation state of the precursor has little effect on the resulting nanocrystals. In fact, we found that Ce(IV) oleate is readily reduced to Ce(III) at at temperatures above 100 °C in the reaction medium. The significant role of air during synthesis therefore suggests that oxygen is altering the surface reactivity of the nanocrystals, as opposed to the precursor. We investigated the origin of nanoribbon formation and found that the presence of acetate ligands is responsible for nanoribbon formation in syntheses under N 2 , with more acetate leading to longer nanoribbons. These insights were used to identify conditions to predictably grow various sizes and shapes of nanocubes and nanoribbons. The findings elucidate the effects that various synthetic parameters can have on cerium oxide nanocrystal synthesis and suggest that redox reactivity may influence growth and properties in other syntheses where changes in the oxidation state occur for the precursor or the nanocrystal surface.

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Section: Resultssupporting

confidence: 91%

Reaction Atmospheres and Surface Ligation Control Surface Reactivity and Morphology of Cerium Oxide Nanocrystals during Continuous Addition Synthesis

Knecht

Hutchison

2022

Inorg. Chem.

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“…The XRD spectra of the NC particles shows characteristic peaks at 2θ = 33.12°, 55.76°, 69.87°, and 82.7°, which can be indexed as the (200), (311), (400), and (420) planes, respectively (Figure 3A); these results are in agreement with previously published reports. 51,52 In the case of the neat PVA hydrogel, a broad peak between 2θ = 20−25°is assigned to the polymer matrix. The broadness of the peak indicates the amorphous nature of the polymer, which is in agreement with previously published reports.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Dual Crosslinked Antioxidant Mixture of Poly(vinyl alcohol) and Cerium Oxide Nanoparticles as a Bioink for 3D Bioprinting

Rizwana,

Maslekar,

Chatterjee

et al. 2023

ACS Appl. Nano Mater.

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Three-dimensional (3D) bioprinting has made it possible to fabricate structures with intricate morphologies and architectures, which is considered difficult to do when using other conventional techniques like electrospinning. Although the 3D printing of thermoplastics has seen a huge boom in the past few years, it has been challenging to translate this technology to cellbased printing. A major limitation in bioprinting is the lack of inks that allow for the printing of 3D structures that meet the biological requirements of a specific organ or tissue. A bioink is a viscous polymer solution that cells are incorporated into before printing. Therefore, a bioink must have specific characteristics to ensure both good printability and biocompatibility. Despite the progress that has been made in bioprinting, achieving a balance between these two properties has been difficult. In this work, we developed a multimodal bioink that serves as both a cell carrier and a free radical scavenger for treating peripheral nerve injury. This bioink comprises poly(vinyl alcohol) (PVA) and cerium oxide nanoparticles (also called nanoceria (NC)) and was developed with a dual crosslinking method that utilizes citric acid and sodium hydroxide. By employing this dual crosslinking method, good printability of the bioink and shape fidelity of the bioprinted structure were achieved. Additionally, a cell viability study demonstrated that the cells remained compatible and viable even after they underwent the printing process. The combination of this PVA/NC bioink and the dual crosslinking method proved to be effective in enhancing printability and cell biocompatibility for extrusion-based bioprinting applications.

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Green synthesis routes for spinel ferrite nanoparticles: a short review on the recent trends

Kurian¹

2023

J Aust Ceram Soc

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Properties of nanoceria particles: Comparison among thermal and microwave mediated synthesis

Cited by 5 publications

References 12 publications

Reaction Atmospheres and Surface Ligation Control Surface Reactivity and Morphology of Cerium Oxide Nanocrystals during Continuous Addition Synthesis

Reaction Atmospheres and Surface Ligation Control Surface Reactivity and Morphology of Cerium Oxide Nanocrystals during Continuous Addition Synthesis

Dual Crosslinked Antioxidant Mixture of Poly(vinyl alcohol) and Cerium Oxide Nanoparticles as a Bioink for 3D Bioprinting

Green synthesis routes for spinel ferrite nanoparticles: a short review on the recent trends

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