scholarly journals SYNTHESIS OF NANOCRYSTALLINE NICKEL OXIDE POWDERS VIA GLYCINE-NITRATE COMBUSTION

2005 ◽  
Vol 13 (13) ◽  
pp. 53-63
Author(s):  
J.C. Toniolo ◽  
R. Bonadiman ◽  
L. L. Oliveira ◽  
J.M. Hohemberger ◽  
C. P. Bergmann
Keyword(s):  
Nickel Oxide ◽  
Precursor Solution ◽  
Optical Filters ◽  
Nanocrystalline Nickel ◽  
Alkaline Batteries ◽  
Oxide Powders ◽  
Potential Applications ◽  
Coloring Agents ◽  
Glycine Nitrate Combustion ◽  
Combustion Technique

NiO is a candidate material for a variety of potential applications, for example, active optical filters, antiferromagnetic layers, coloring agents for enamel, pigments, catalysts, cathode materials for alkaline batteries and temperature sensors. Nanocrystalline nickel oxide powders have been synthesized by the combustion technique using glycine as a fuel and nitrate as an oxidizer. The precursor solution was heated to evaporate water, yielding a viscous liquid. It ignited and underwent self-sustaining combustion, producing an ash composed of the oxide product. The as-synthesized particles have been characterized by Xray diffraction (XRD), and scanning electron microscopy (SEM). Nanocrystalline nickel oxide was possible to be obtained from fuel-lean ratios. The smallest crystallite size was obtained under fuel-lean (0.09) formulation. The size of the NiO nanoparticles varied from 4 to 18 nm.

Preparation of nanocrystalline nickel oxide–yttria-stabilized zirconia composite powder by solution combustion with ignition of glycine fuel

2001 ◽  
Vol 16 (12) ◽  
pp. 3621-3627 ◽  
Author(s):  
Sun-Jae Kim ◽  
Wonhee Lee ◽  
Won-Jun Lee ◽  
Soon Dong Park ◽  
Jae Sung Song ◽  
...  
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Nickel Oxide ◽  
Composite Powder ◽  
Precursor Solution ◽  
Stabilized Zirconia ◽  
Nanocrystalline Nickel ◽  
Solution Combustion ◽  
Solution Ph ◽  
Composite Powders ◽  
Boundary Area

Nanocrystalline nickel oxide–yttrium-stabilized zirconia (NiO/YSZ) composite powder for the solid oxide fuel cells was prepared by solution combustion through control of pH values and contents of glycine fuel in precursor solution. A strongly acidic precursor solution with appropriate amounts of glycine fuel added increased the specific surface area of the synthesized composite powders. This results from the increased binding of metal ions and glycine under strongly acidic solution (pH = 0.5) conditions. After sintering and reducing treatment of nanocrystalline NiO/YSZ composite, the Ni/YSZ pellet showed an ideal microstructure: fine Ni particles of 3 to 5 μm were distributed uniformly, and fine micropores around Ni metal particles were formed, thus leading to an increase in the triple phase boundary area among gas, Ni and YSZ.

scholarly journals Growth Parameters for Films of Hydrothermally Synthesized One-Dimensional Nanocrystals of Zinc Oxide

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Mohammad A. Mahmood ◽  
Sadaqat Jan ◽  
Ibrar A. Shah ◽  
Imran Khan
Keyword(s):  
Zinc Oxide ◽  
Growth Parameters ◽  
Precursor Solution ◽  
Synthesis Temperature ◽  
Growth Time ◽  
Material Research ◽  
Hydrothermal Route ◽  
Seeding Layer ◽  
Potential Applications

Zinc oxide has been the focus of material research due to its potential applications in a variety of novel fields. The material exhibits anisotropic growth in the form of single crystal rods/wires of length in microns and thickness in several tens of nanometers through a facile and low temperature hydrothermal route wherein size, morphology, orientation, and growth rate are strongly dependent on a number of synthesis parameters. In this review article we intend to present/discuss the effects of important growth parameters of zinc oxide that have been reported in the literature. These parameters include concentration of the precursor solution, growth time, role of hexamine, synthesis temperature, pH of the precursor, and seeding layer deposited on a substrate.

Oxygen Partial Pressure Dependent Properties of Nanocrystalline Nickel Oxide Films

2013 ◽  
pp. 165-168
Author(s):  
A. Mallikarjuna Reddy ◽  
Y. Ashok Kumar Reddy ◽  
Ch. Seshendra Reddy ◽  
A. Sivasankar Reddy ◽  
P. Sreedhara Reddy
Keyword(s):  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Nickel Oxide ◽  
Oxide Films ◽  
Nanocrystalline Nickel ◽  
Nickel Oxide Films

Mechanical Behavior of Bioactive Glass-Polyvinyl Alcohol Hybrid Foams Obtained by the Sol-Gel Process

2005 ◽  
Vol 284-286 ◽  
pp. 757-760 ◽  
Author(s):  
Marivalda Pereira ◽  
Showan N. Nazhat ◽  
Julian R. Jones ◽  
Larry L. Hench
Keyword(s):  
Polyvinyl Alcohol ◽  
Bioactive Glass ◽  
Mechanical Behavior ◽  
Sol Gel ◽  
Precursor Solution ◽  
High Porosity ◽  
Soft Tissue Regeneration ◽  
Sol Gel Process ◽  
Potential Applications ◽  
Hybrid Foams

The possibility of enhancing mechanical properties by incorporation of polymeric components to sol-gel derived materials is extremely attractive to prepare macroporous scaffolds, leading to materials with potential applications in both hard and soft tissue regeneration. In this work bioactive glass-polyvinyl alcohol hybrids were developed and their mechanical behavior was evaluated. Hybrids were synthesized by adding polyvinyl alcohol to a sol-gel precursor solution, which was then foamed with the addition of a surfactant and vigorous agitation. The foams were cast, aged and dried at 40°C. A cleaning step to decrease the acidic character of the obtained hybrids was undertaken by immersion in a NH4OH solution. The mechanical behavior of the hybrids was evaluated in compression using both stress and strain control tests. Hybrid foams had a high porosity varying from 60-90% and the macropore diameter ranged from 10 to 600 µm. The modal macropore diameter varied with the inorganic phase composition and with the polymer content in the hybrid. The strain at fracture of the as prepared hybrid foams was substantially greater than pure gel-glass foams. The cleaned hybrids presented a slightly higher strength and lower deformation than the as prepared foams.

Spatially and spectrally resolved ultra-narrowband TE-polarization absorber based on the guide-mode resonance

2017 ◽  
Vol 31 (24) ◽  
pp. 1750223
Author(s):  
Yan-Lin Liao ◽  
Yan Zhao ◽  
Xingfang Zhang ◽  
Wen Zhang ◽  
Zhongzhu Wang
Keyword(s):  
Normal Incidence ◽  
Optical Filters ◽  
Grating Period ◽  
Angle Measurement ◽  
Angular Width ◽  
Dielectric Grating ◽  
Guide Mode ◽  
Potential Applications ◽  
Polarization Electric Field ◽  
Spectrally Resolved

A spatially and spectrally resolved ultra-narrowband absorber with a dielectric grating and metal substrate has been reported. The absorber shows that the absorption rate is more than 0.99 with the absorption bandwidth less than 1.5 nm at normal incidence for TE polarization (electric field is parallel to grating grooves). The angular width of the absorption is about 0.27[Formula: see text]. The wavelength-angle sensitivity and absorption-angle sensitivity are 13.4 nm per degree and 296.3% per degree, respectively. The simulation results also show the spatially and spectrally resolved ultra-narrowband absorption is originated from the guide-mode resonance. In addition, the wavelength-angle sensitivity can be improved by enlarging the grating period according to the guide-mode resonance mechanism. The proposed absorber has potential applications in optical filters, angle measurement and thermal emitters.

scholarly journals Copper Oxide Nanomaterials Prepared by Solution Methods, Some Properties, and Potential Applications: A Brief Review

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Thi Ha Tran ◽  
Viet Tuyen Nguyen
Keyword(s):  
Large Scale ◽  
Cupric Oxide ◽  
Bulk Material ◽  
Precursor Solution ◽  
High Quality ◽  
Chemical Methods ◽  
Narrow Bandgap ◽  
Solution Methods ◽  
Potential Applications ◽  
Near Future

Cupric oxide (CuO), having a narrow bandgap of 1.2 eV and a variety of chemophysical properties, is recently attractive in many fields such as energy conversion, optoelectronic devices, and catalyst. Compared with bulk material, the advanced properties of CuO nanostructures have been demonstrated; however, the fact that these materials cannot yet be produced in large scale is an obstacle to realize the potential applications of this material. In this respect, chemical methods seem to be efficient synthesis processes which yield not only large quantities but also high quality and advanced material properties. In this paper, the effect of some general factors on the morphology and properties of CuO nanomaterials prepared by solution methods will be overviewed. In terms of advanced nanostructure synthesis, microwave method in which copper hydroxide nanostructures are produced in the precursor solution and sequentially transformed by microwave into CuO may be considered as a promising method to explore in the near future. This method produces not only large quantities of nanoproducts in a short reaction time of several minutes, but also high quality materials with advanced properties. A brief review on some unique properties and applications of CuO nanostructures will be also presented.

Sign in / Sign up

Export Citation Format

Share Document