Citrate-nitrate gel transformation behavior during the synthesis of combustion-derived NiO-yttria-stabilized zirconia composite

2003 ◽  
Vol 18 (7) ◽  
pp. 1551-1560 ◽  
Author(s):  
Marjan Marinšek ◽  
Klementina Zupan ◽  
Jadran Maček
Keyword(s):  
Evolved Gas Analysis ◽  
Thermal Characteristics ◽  
Gas Analysis ◽  
Yttria Stabilized Zirconia ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
Evolved Gas ◽  
Combustion Technique ◽  
Decomposition Properties

NiO-yttria-stabilized zirconia powder mixtures were prepared from reactive citrate-nitrate gels using the combustion technique. The influence of the fuel/oxidant molar ratio in the precursor on the combustion rate and its thermal characteristics was studied by thermal analysis and evolved gas analysis. It was found that the precursor thermal decomposition properties depended strongly on the citrate/nitrate ratio prior to the combustion. Intermediate precursors and final powder ashes were also analyzed by x-ray diffraction.

Irreversible hydrogenation of solid C60 with and without catalytic metals

1999 ◽  
Vol 14 (5) ◽  
pp. 2138-2146 ◽  
Author(s):  
Eric L. Brosha ◽  
John Davey ◽  
Fernando H. Garzon ◽  
Shimshon Gottesfeld
Keyword(s):  
Diffraction Analysis ◽  
Volume Fraction ◽  
Evolved Gas Analysis ◽  
Amorphous Material ◽  
Single Layer ◽  
Gas Analysis ◽  
X Ray Diffraction ◽  
Evolved Gas ◽  
X Ray ◽  
Graphite Sheets

The dehydrogenation of C60 · H18.7 was studied using thermogravimetric and powder x-ray diffraction analysis. C60 · H18.7 was found to be stable up to 430 °C in Ar at which point the release of hydrogen initiated the collapse of a fraction of fullerene molecules. X-ray diffraction analysis performed on C60 · H18.7 samples dehydrogenated at 454, 475, and 600 °C displayed an increasing volume fraction of amorphous material. The decomposition product comprises randomly oriented, single-layer graphite sheets. Evolved gas analysis using gas chromatograph (GC) mass spectroscopy confirmed the presence of both H2 and methane upon dehydrogenation. Attempts to improve reversibility or reduce hydrogenation/ dehydrogenation temperatures by addition of Ru and Pt catalysts were unsuccessful.

scholarly journals Textural and Thermal Properties of the Novel Fucoidan/Nano-Oxides Hybrid Materials with Cosmetic, Pharmaceutical and Environmental Potential

2022 ◽  
Vol 23 (2) ◽  
pp. 805
Author(s):  
Jakub Matusiak ◽  
Urszula Maciołek ◽  
Małgorzata Kosińska-Pezda ◽  
Dariusz Sternik ◽  
Jolanta Orzeł ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Evolved Gas Analysis ◽  
Nitrogen Adsorption ◽  
Gas Analysis ◽  
Point Of View ◽  
The Novel ◽  
X Ray Diffraction ◽  
Evolved Gas ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Pharmaceutical Industries

The main purpose of the research was to obtain and study hybrid materials based on three different nano-oxides commonly used in the cosmetic and pharmaceutical industries: Al2O3, TiO2, and ZnO, with the natural bioactive polysaccharide fucoidan. Since the mentioned oxides are largely utilized by industry, there is no doubt that the presented studies are important from an environmental point of view. On the basis of the textural studies (dynamic light scattering DLS, low temperature nitrogen adsorption, X-ray diffraction analysis XRD, scanning electron microscopy SEM) it was proved that the properties of the hybrid materials differ from the pure components of the system. Moreover, the advanced thermal analysis (TG-DTG-DSC) combined with the evolved gas analysis using Fourier transformed infrared spectroscopy (FTIR) and mass spectrometry were applied to describe the thermal decomposition of fucoidan, oxides and hybrid materials. It was found that the interactions between the polymer and the oxides results in the formation of the hybrid materials due to the functionalization of the nanoparticles surface, and that their thermal stability increased when compared to the pure substrates. Such findings definitely fill the literature void regarding the fucoidan based hybrid materials and help the industrial formulators in the preparation of new products.

The characterization of patina components by X-ray diffraction and evolved gas analysis

1987 ◽  
Vol 27 (7) ◽  
pp. 669-684 ◽  
Author(s):  
K. Nassau ◽  
P.K. Gallagher ◽  
A.E. Miller ◽  
T.E. Graedel
Keyword(s):  
Evolved Gas Analysis ◽  
Gas Analysis ◽  
X Ray Diffraction ◽  
Evolved Gas ◽  
X Ray

scholarly journals Application of Evolved Gas Analysis Technique for Speciation of Minor Minerals in Clays

Minerals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 824
Author(s):  
Eulalia Zumaquero Silvero ◽  
Jessica Gilabert Albiol ◽  
Eva María Díaz-Canales ◽  
María Jesús Ventura Vaquer ◽  
María Pilar Gómez-Tena
Keyword(s):  
Infrared Spectroscopy ◽  
Evolved Gas Analysis ◽  
Industrial Process ◽  
Gas Analysis ◽  
X Ray Diffraction ◽  
Mineralogical Characterization ◽  
Evolved Gas ◽  
Analysis Technique

Mineralogical characterization of clays used in manufacturing of traditional ceramic products is critical for guarantee the quality of the final product, but also for assessing the environmental impact of the industrial process in terms of atmospheric emissions. In fact, the presence of impurities even in low-level concentrations can have a big impact. So, it is very important to carry out an accurate mineral quantification of those minerals which are related to carbon dioxide and acid emissions (hydrogen fluoride, hydrogen chloride or sulfur dioxide). The development of hyphenated techniques coupling thermal analysis equipment with mass spectrometry and Fourier-transform infrared spectroscopy provides more valuable information and lower limit quantification than other primary techniques, such as X-ray diffraction or infrared spectroscopy. The main objective of this work is to develop an analytical procedure using evolved gas analysis to identify and quantify minerals such as chlorides, sulfides, carbonaceous materials and minor clay minerals. In addition to this, the study includes the analysis of acid emissions during the ceramic firing treatment even if they are present at low quantitative levels. This methodology was applied to reference materials so that it allows the identification of sulfur, chlorine, fluorine and carbonaceous compounds in concentrations lower than 1%.

Characterizations of Synthetic 8mol% YSZ with Comparison to 3mol %YSZ for HT-SOFC

2020 ◽  
Vol 38 (4A) ◽  
pp. 491-500
Author(s):  
Abeer F. Al-Attar ◽  
Saad B. H. Farid ◽  
Fadhil A. Hashim
Keyword(s):  
Ionic Conductivity ◽  
Electrochemical Impedance ◽  
Structural Information ◽  
Impedance Analysis ◽  
High Energy ◽  
Yttria Stabilized Zirconia ◽  
X Ray Diffraction ◽  
Stabilized Zirconia ◽  
Powder Morphology ◽  
X Ray

In this work, Yttria (Y2O3) was successfully doped into tetragonal 3mol% yttria stabilized Zirconia (3YSZ) by high energy-mechanical milling to synthesize 8mol% yttria stabilized Zirconia (8YSZ) used as an electrolyte for high temperature solid oxide fuel cells (HT-SOFC). This work aims to evaluate the densification and ionic conductivity of the sintered electrolytes at 1650°C. The bulk density was measured according to ASTM C373-17. The powder morphology and the microstructure of the sintered electrolytes were analyzed via Field Emission Scanning Electron Microscopy (FESEM). The chemical analysis was obtained with Energy-dispersive X-ray spectroscopy (EDS). Also, X-ray diffraction (XRD) was used to obtain structural information of the starting materials and the sintered electrolytes. The ionic conductivity was obtained through electrochemical impedance spectroscopy (EIS) in the air as a function of temperatures at a frequency range of 100(mHz)-100(kHz). It is found that the 3YSZ has a higher density than the 8YSZ. The impedance analysis showed that the ionic conductivity of the prepared 8YSZ at 800°C is0.906 (S.cm) and it was 0.214(S.cm) of the 3YSZ. Besides, 8YSZ has a lower activation energy 0.774(eV) than that of the 3YSZ 0.901(eV). Thus, the prepared 8YSZ can be nominated as an electrolyte for the HT-SOFC.

Evolved Gas Analysis by Infrared Spectroscopy

2010 ◽  
Vol 45 (4) ◽  
pp. 241-273 ◽  
Author(s):  
S. Materazzi ◽  
S. Vecchio
Keyword(s):  
Infrared Spectroscopy ◽  
Evolved Gas Analysis ◽  
Gas Analysis ◽  
Evolved Gas
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