Structural Characterization of Ceria Nanoparticles

N2 - We have synthesized ceria nanoparticles by reacting cerium salts and sodium hydroxide without any additive in order to avoid possible cytotoxicity. The synthesized ceria nanoparticles were with cubic structure according to X-ray diffraction and have diameters between 6 and 10 nm analyzed by transmission electron microscopy. Aggregation behaviors of ceria nanoparticles in DI water and cell culture media have been studied by dynamic light scattering. In de-ionized water, ceria nanoparticles formed a stable colloidal solution with hydrodynamic size ~ 70 nm and zeta potential ~ 47 mV. Dispersion of the nanoparticles in serum-free media was found to result in larger aggregates, while the nanoparticles in serumcontaining media form a stable solution, which suggests that proteins in serum and ceria nanoparticles have some interactions. In cellular uptake test, entry of ceria nanoparticles into HeLa cells incubated in serum-containing media at 37 °C for 60 min was observed and without cytotoxicity.

Solvothermal synthesis of ceria nanoparticles with …

Recently, ceria has been the focus of research investigating health effects of nanoparticles.

SYNTHESIS OF CERIA NANOPARTICLES WITH …

Oxides play a central role in important industrial processes, includingapplications such as the production of renewable energy, remediation of environmental pollutants, and the synthesis of fine chemicals. They were originally used as catalyst supports and were thought to be chemically inert, but now they are used to build catalysts tailored toward improved selectivity and activity in chemical reactions. Many studies have compared the morphological, electronic, and chemical properties of oxide materials with those of unoxidized metals. Researchers know much less about the properties of oxides at the nanoscale, which display distinct behavior from their bulk counterparts. More is known about metal nanoparticles.

Microwave-assisted synthesis of ceria nanoparticles.

This Account describes the properties of inverse catalysts composed of CeOx nanoparticles supported on Cu(111) or CuO/Cu(111) as determined through the methods described above. Ceria is an important material for redox chemistry because of its interchangeable oxidation states (Ce4+ and Ce3+). Cu(111), meanwhile, is a standard catalyst for reactions such as CO oxidation and the water-gas shift (WGS). This metal serves as an ideal replacement for other noble metals that are neither abundant nor cost effective. To prepare the inverse system we deposited nanoparticles (2–20 nm) of cerium oxide onto the Cu(111) surface. During this process, the Cu(111) surface grows an oxide layer that is characteristic of Cu2O (Cu1+). This oxide can influence the growth of ceria nanoparticles. Evidence suggests triangular-shaped CeO2(111) grows on Cu2O(111) surfaces while rectangular CeO2(100) grows on Cu4O3(111) surfaces.

Aggregationbehaviors of ceria nanoparticles in DI water and cell culture media havebeen studied by dynamic light scattering.

The two oxidation states of ceria nanoparticles, ..

Cerium oxide nanoparticles were prepared by a microemulsion method. The nanosized micelles act as reactors for particle formation. The microemulsion system consisted of the surfactant, sodium bis(2-ethylhexyl) sulphosuccinate (AOT), toluene and water. All the chemicals were purchased from Aldrich Chemicals Company, Inc. Details of the synthesis are published elsewhere []. The particles obtained in toluene were re-dispersed in water by evaporating the toluene prior to use in the cell culture studies.

Synthesis of nano-sized ceria (CeO2) ..

These results demonstrate that the use of nano-Ceria could prove beneficial for the in vivo repair of spinal cord neurons based on our experiments evaluating the nano-ceria in a more realistic in vitro model of spinal cord utilizing adult CNS cells. It is also anticipated that they could be good candidates for drug delivery and imaging applications. Based on the surface chemical properties of Ceria nanoparticles [] we propose a hypothesis to explain the neuroprotective role of this material.

Auto-catalytic Ceria Nanoparticles Offer …

A microemulsion process was used to synthesize the cerium oxide nanoparticles () and they were characterized for morphology and surface chemistry by high-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). HRTEM indicated the formation of uniformly distributed, non-agglomerated nanoparticles of Cerium oxide in the range of 3–5nm as shown in the image in . shows a XPS spectrum that indicates a mixed valence state (Ce3+ and Ce4+) for the synthesized Cerium oxide nanoparticles. These results are similar to our previously published results [, , ].