Nano-sized ceria particles prepared by spray pyrolysis using polymeric precursor solution

Kang, Hee Sang; Kang, Yun Chan; Koo, Hye Young; Ju, Seo Hee; Kim, Do Youb; Hong, Seung Sae; Sohn, Jin-Hun; Jung, Kyeong Youl; Park, Seung Bin

doi:10.1016/j.mseb.2005.09.063

Cited by 62 publications

(27 citation statements)

References 26 publications

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“…BM is one of the most common methods for the preparation of nanocrystalline materials [18], as it is portable, non-hazardous, and cheaper compared to other techniques, which require high temperature maintenance, use of hazardous chemicals, creation of a specific atmosphere, etc. [18][19][20]. In this work, the authors investigate only the effect of milling on microstructural parameter such as lattice parameter and lattice strain rather than change in surface area of milled powder.…”

Section: Introductionmentioning

confidence: 99%

Non-monotonic lattice parameter variation in ball-milled ceria

2015

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High-energy ball milling is utilized in creating microstructural changes (such as change in lattice parameter, lattice strain) within micro-ceria, which were quantified using line profile analysis by X-ray diffraction. Crystallite size significantly decreased from 85 to 11 nm when subjected to 4 h of high-energy ball milling, and then remained same with increase in milling duration (up to 16 h of milling). Three different methods, namely NelsonRiley function, Cohen's method, and Pawley fitting, were used to calculate the lattice parameter and a lattice expansion from 5.4082 to 5.4147 Å was observed for a duration of 0 up to 12 h. The effect of milling on generation of residual strain and the probability of stacking fault in affecting the lattice parameter are delineated in the current work. Non-monotonic change of lattice parameter with saturation of crystallite size is attributed to the vacancy-induced stresses that generate at inter-crystallite regions and render excessive free volume during high-energy ball milling.

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Section: Introductionmentioning

confidence: 99%

Non-monotonic lattice parameter variation in ball-milled ceria

2015

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“…CeO 2 nanostructures have received much attention due to their changed and enhanced characteristics as compared to their bulk counterparts. [12][13][14][15] In recent years, several synthetic methods have been used to explore CeO 2 nanostructures fabrication such as the surfactant-assisted approach, [16] micro-emulsion, [17] spray pyrolysis, pyrolysis (low temperature or spray), [18] thermodecomposition, [19] reflex method, [20] hexamethylenetetramine, [21] microwave-assisted heating, [22] chemical co-precipitation, [23] organometallic decomposition, [20] solution and solid combustion methods, [24] sol-gel methods, [25] flow method, [26] hydrothermal synthesis, [27] microwave heating, [28] and gas and sonochemical methods. [29] The chemical co-precipitation technique has several advantages, such as low cost, high reproducibility, versatility, and control over particle sizes and shapes.…”

Section: Rare Earth Oxide Nanostructures Have Extraordi-mentioning

confidence: 99%

Mg Doping Induced Effects on Structural, Optical, and Electrical Properties as Well as Cytotoxicity of CeO2 Nanostructures

Iqbal

Jan

Awan³

et al. 2016

Metall Mater Trans B

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Here, Mg x Ce 1Àx O 2 (where x = 0, 0.01, 0.02, 0.03, 0.04, and 0.05) nanostructures have been successfully synthesized by using a simple, easy, and cost-effective soft chemical method. X-ray diffraction (XRD) patterns substantiate the single-phase formation of a CeO 2 cubic fluorite structure for all samples. Infrared spectroscopy results depict the presence of peaks only related to Ce-O bonding, which confirms the XRD results. It has been observed via ultraviolet (UV)-visible spectroscopy that Mg doping has tuned the optical band gap of CeO 2 significantly. The electrical conductivity of CeO 2 nanostructures has been found to increase with Mg doping, which is attributed to enhancement in carrier concentration due to the different valance states of dopant and host ions. Selective cytotoxic behavior of Mg x Ce 1Àx O 2 nanostructures has been determined for neuroblastoma (SH-SY5Y) cancerous and HEK-293 healthy cells. Both doped and undoped CeO 2 nanostructures have been found to be toxic for cancer cells and safe toward healthy cells. This selective toxic behavior of the synthesized nanostructures has been assigned to the different levels of reactive oxygen species (ROS) generation in different types of cells. This makes the synthesized nanostructures a potential option for cancer therapy in the near future.

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“…In the fourth and last stage, we expect to have a layer with higher porosity in which the particles may slightly start to grow. Increasing temperature to 580 ºC along with increasing solution flow rate to 1.58 ml/min will result in fast evaporation of highly concentrated solution and lack of time for solute diffusion and particle densification resulting in highly porous films 70 . Fig.…”

Section: Effect Of Precursor Solution Concentrationmentioning

confidence: 99%

Microstructure Sensitive Design and Processing in Solid Oxide Electrolyzer Cell

Garmestani¹,

Herring²

2009

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SUMMARYThe aim of this study was to develop an inexpensive manufacturing process for deposition of functionally graded thin films of LSM oxides with porosity graded microstructures for use as IT-SOFCs cathode. The spray pyrolysis method was chosen as a low-temperature processing technique for deposition of porous LSM films onto dense YSZ substrates. The effort was directed toward the optimization of the processing conditions for deposition of high quality LSM films with variety of morphologies in the range of dense to porous microstructures. Results of optimization studies of spray parameters revealed that the substrate surface temperature is the most critical parameter influencing the roughness and morphology, porosity, cracking and crystallinity of the film. Physical and chemical properties of deposited thin films such as porosity, morphology, phase crystallinity and compositional homogeneity have shown to be extensively dependent on the preparation conditions. Detailed analysis of the film formation mechanisms have been discussed in this work. It is suggested that using volatile metal-organic precursors as in CVD would alter the film formation mechanism to MOCVD process in which films of high quality can be processed. Novel electrode microstructures currently include a graded microstructure wherein the large pores are made close to the surface in outer layers for maximum mass transport into the electrode structure and smaller pores and particles close to the electrolyte interface would create maximum number of active reaction sites. Taking the advantage of simplicity of spray pyrolysis technique combined with using metal-organic compounds, the conventional ultrasonic spray system was upgraded to a novel system whereby highly crystalline multiMicrostructure Sensitive Design for Materials in Solid Oxide Electrolyzer Cell, Garmestani vi layered porosity graded LSM cathode with columnar morphology with good electrical conductivity in the range of 500-700 °C was fabricated through a multi-step spray and via optimizing spray parameters. This achievement for the current graded LSM cathode would allow its use in IT-SOFCs.Microstructure Sensitive Design for Materials in Solid Oxide Electrolyzer Cell, Garmestani 7

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Nano-sized ceria particles prepared by spray pyrolysis using polymeric precursor solution

Cited by 62 publications

References 26 publications

Non-monotonic lattice parameter variation in ball-milled ceria

Non-monotonic lattice parameter variation in ball-milled ceria

Mg Doping Induced Effects on Structural, Optical, and Electrical Properties as Well as Cytotoxicity of CeO2 Nanostructures

Microstructure Sensitive Design and Processing in Solid Oxide Electrolyzer Cell

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