Structure and properties of cerium oxides in bulk and nanoparticulate forms

Gangopadhyay, Shruba; Frolov, Dmitry D.; Masunov, Artëm E.; Seal, Sudipta

doi:10.1016/j.jallcom.2013.09.013

Cited by 80 publications

(25 citation statements)

References 121 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In bulk form, CeO 2 is a singular rare earth oxide and does not show any crystallographic modifications by temperature increase up to its melting point. [1][2][3][4][5] Its various applications such as acting as a catalyst; use in sensor, solid oxide fuel cells, and sunscreen cosmetics; and its O 2 storage capacity, role in CO 2 solar conversion, and antibacterial applications are due to its idiosyncratic ability to alter the oxidation states. [6][7][8][9][10] Ordinarily, CeO 2 NPs are fabricated by physical and chemical methods including hydrothermal, 11 flame spray pyrolysis, 12 thermal decomposition, 13 aqueous precipitation, 14 and coprecipitation technique.…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial potential of green synthesized CeO2 nanoparticles from Olea europaea leaf extract

Maqbool

Nazar

Naz

et al. 2016

IJN

156

101

View full text Add to dashboard Cite

This article reports the green fabrication of cerium oxide nanoparticles (CeO 2 NPs) using Olea europaea leaf extract and their applications as effective antimicrobial agents. O. europaea leaf extract functions as a chelating agent for reduction of cerium nitrate. The resulting CeO 2 NPs exhibit pure single-face cubic structure, which is examined by X-ray diffraction, with a uniform spherical shape and a mean size 24 nm observed through scanning electron microscopy and transmission electron microscopy. Ultraviolet-visible spectroscopy confirms the characteristic absorption peak of CeO 2 NPs at 315 nm. Fourier transform infrared spectroscopy reflects stretching frequencies at 459 cm −1 , showing utilization of natural components for the production of NPs. Thermal gravimetric analysis predicts the successful capping of CeO 2 NPs by bioactive molecules present in the plant extract. The antimicrobial studies show significant zone of inhibition against bacterial and fungal strains. The higher activities shown by the green synthesized NPs than the plant extract lead to the conclusion that they can be effectively used in biomedical application. Furthermore, reduction of cerium salt by plant extract will reduce environmental impact over chemical synthesis.

show abstract

Section: Introductionmentioning

confidence: 99%

Antimicrobial potential of green synthesized CeO2 nanoparticles from Olea europaea leaf extract

Maqbool

Nazar

Naz

et al. 2016

IJN

156

101

View full text Add to dashboard Cite

show abstract

“…Nanoparticulate ceria is used in a variety of ultra-fine polishing applications, including semiconductor wafers, computer hard-disk drives, and optics. In high-tech applications, such as photomasks and disk drives, surface roughness values of less than 0.2 nm have been achieved [55]. The ceria for polishing applications is available in different purities.…”

Section: Ceriummentioning

confidence: 99%

Rare Earths and the Balance Problem: How to Deal with Changing Markets?

Binnemans

Jones

Müller

et al. 2018

J. Sustain. Metall.

241

136

View full text Add to dashboard Cite

The balance between the market demand and the natural abundance of the rare-earth elements (REEs) in ores, often referred to as the Balance Problem (or the Balancing Problem), is a major issue for REE suppliers. The ideal situation is a perfect match between the market demand for and the production of REEs, so that there are no surpluses of any of the REEs. This means that the rare-earth industry must find new uses for REEs that are available in excess and search for substitutes for REEs that have either limited availability or are high in demand. We present an overview of the trends in the applications for the different REEs and show that the demand for REEs for use in magnets, catalysts, and alloys is still increasing, while the application of REEs in polishing agents, glass, and ceramics are stable. On the other hand, the use of REEs in nickel-metal-hydride (NiMH) batteries and lamp phosphors is decreasing. These changes in the REE market have an influence on the Balance Problem, because the REEs that can be recycled from fluorescent lamps, cathode-ray tubes (CRTs), and NiMH batteries have to be at least partly reused in other applications. Magnesium and aluminum alloys offer an opportunity to mitigate the Balance Problem caused by these changes in the REE market. This is illustrated for REEs that can be recycled from fluorescent-lamp phosphor waste, CRT phosphors, and NiMH batteries. At present, five REEs (Nd, Eu, Tb, Dy, and Y) are being considered as very critical by Europe, the United States, and Japan, but we forecast that in the medium term, only neodymium will remain a critical REE. This paper discusses the relationship between criticality and the Balance Problem and shows how this relationship influences the market for specific REEs.

show abstract

“…CeO 2 nanoparticles of easy shifting the redox equilibrium are superior for a variety of chemical processes, including production and purification of hydrogen, and carbon monoxide removal from the automobile exhaust [1]. Mobility of oxygen vacancies and consequently high ionic conductivity in CeO 2 nanoparticles makes it a promising electrolyte for fuel cells.…”

Section: Introductionmentioning

confidence: 99%

“…Mobility of oxygen vacancies and consequently high ionic conductivity in CeO 2 nanoparticles makes it a promising electrolyte for fuel cells. Also, electronic structure of CeO 2 nanoparticles leads to its use as anti-UV coating material in cosmetic industry and manufacturing of glass windows [1,2] because CeO 2 nanoparticles are highly transparent to visible light and highly absorbent to ultraviolet (UV) radiation (<400 nm). They also have a low refractive index because they exhibit an optical band gap associated with a charge transfer band of about 3.0 eV [3,4].…”

Section: Introductionmentioning

confidence: 99%