XRD and FTIR analysis heat treated lithium bismo-borate glasses doped with 1.0 mol% copper ferrite

2018 ◽  
Author(s):  
Arti Yadav ◽  
P. Narwal ◽  
Manjeet S. Dahiya ◽  
T. Dahiya ◽  
A. Agarwal ◽  
...  
Keyword(s):  
Copper Ferrite ◽  
Borate Glasses ◽  
Ftir Analysis ◽  
Heat Treated

Effect of Heat Treatment on the Combustion Characteristics of a Lignite

2019 ◽  
Vol 141 (7) ◽  
Author(s):  
Zhezi Zhang ◽  
Mingming Zhu ◽  
Jianbo Li ◽  
Kai Zhang ◽  
Guoqing Shen ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Ignition Delay ◽  
Delay Time ◽  
Heat Treatment Temperature ◽  
Ignition Delay Time ◽  
Treatment Temperature ◽  
Ftir Analysis ◽  
Single Particles ◽  
Heat Treated ◽  
Ignition And Combustion

In this study, the ignition and combustion behavior of raw and heat-treated single particles of lignite were experimentally investigated, with a focus on the effect of heat treatment temperatures. The lignite particles were heat treated to various final temperatures (473, 623 and 773 K) in nitrogen and characterized using proximate, ultimate, and Fourier transform infrared spectroscopy (FTIR) analysis. A single lignite particle of 2 or 3 mm in diameter was suspended on a silicon carbide fiber and burned in air in a horizontal tube furnace operating at 1123 K. The ignition and combustion process of the particle was record using a color CCD camera at 25 fps. The ignition mechanism, ignition delay time, volatile flame duration, and burnout time of the single particles were examined by processing the recorded images. The proximate and ultimate analysis results indicated that the volatile matter and oxygen contents decreased, while the carbon content increased with increasing temperature of heat treatment. This trend was consistent with observations in the FTIR analysis, in which the intensity of oxygen-containing functional groups decreased with increasing the heat treatment temperature. The ignition of raw and heat treated lignite particles followed a joint hetero-homogeneous mechanism under all conditions studied. The ignition delay time, volatile flame extinction time, and the total combustion time decreased with increasing heat treatment temperature up to 623 K. A further increase in the heat treatment temperature to 773 K resulted in prolonged key ignition and combustion characteristic times.

Highly Porous Hydroxyapatite Ceramics for Engineering Applicatios

2010 ◽  
Vol 63 ◽  
pp. 408-413 ◽  
Author(s):  
Hrvoje Ivankovic ◽  
Sebastijan Orlic ◽  
Dajana Kranzelic ◽  
Emilija Tkalcec
Keyword(s):  
Average Length ◽  
Average Diameter ◽  
Ftir Analysis ◽  
X Ray Diffraction ◽  
Gas Cell ◽  
Porous Hydroxyapatite ◽  
Hydroxyapatite Ceramics ◽  
Heat Treated ◽  
Hydrothermal Transformation ◽  
Highly Porous

Highly porous hydroxyapatite (Ca10(PO4)6(OH)2, HA) was prepared through hydrothermal (HT) transformation of aragonitic cuttlefish bones (Seppia Officinalis L. Adriatic Sea) in the temperature range from 140°C to 220°C for 20 minutes to 48 hours. Mechanism of hydrothermal transformation of bones was investigated by DTA/TG analyzer coupled online with FTIR spectrometric gas cell equipment (DTA-TG-EGA-FTIR analysis), X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). DTA-TG-EGA-FTIR analysis have shown the release of CO2 at about 400°C, 680°C and 990°C. The first release could be attributed to organics not completely removed from the heat treated bones, and the second release to decomposition of unconverted aragonite, whereas, the third one could be attributed to CO3 2– groups incorporated in the structure of HA. The interconnecting porous morphology of the starting material (aragonite) was maintained during the HT treatment. The formation of dandelion-like HA spheres with diameter from 3 to 8 μm were observed, which further transformed into nanoplates and nanorods with an average diameter of about 200-300 nm and an average length of about 8-10 μm.

M�ssbauer and X-ray photoelectron spectroscopic studies of heat-treated calcium borate glasses containing iron

1974 ◽  
Vol 9 (7) ◽  
pp. 1115-1122 ◽  
Author(s):  
M. J. Tricker ◽  
J. M. Thomas ◽  
M. H. Omar ◽  
A. Osman ◽  
A. Bishay
Keyword(s):  
Spectroscopic Studies ◽  
Borate Glasses ◽  
Calcium Borate ◽  
X Ray ◽  
Heat Treated

scholarly journals Hot Resistance of Spores from the Thermophilic Bacillus horneckiae SBP3 of Shallow Hydrothermal Vent Origin Elucidated by Spectroscopic Analyses

2021 ◽  
Vol 11 (9) ◽  
pp. 4256
Author(s):  
Vincenzo Zammuto ◽  
Maria Teresa Caccamo ◽  
Salvatore Magazù ◽  
Antonio Spanò ◽  
Salvatore Guglielmino ◽  
...  
Keyword(s):  
Hydrothermal Vent ◽  
Saturated Fatty Acids ◽  
Protein Structures ◽  
Ftir Analysis ◽  
Basic Information ◽  
Thermophilic Bacillus ◽  
Spectroscopic Analyses ◽  
Heat Treated ◽  
Wet Heat ◽  
Spore Proteins

Spores from Bacillus horneckiae SBP3 (SBP3) of shallow hydrothermal vent origin have recently been reported to survive extreme conditions more often than their close phylogenetic relatives B. horneckiae DSM 23495T (BHO) and B. subtilis 168 (BSU) used in biodosimetry and the space microbiology model. To investigate the structures of unheated spores, Fourier-transform infrared spectroscopy (FTIR) analysis was used. The FTIR spectra of the spores from the strains SBP3, BHO and BSU mainly differed in the region that referred to lipids and amino acids or polypeptides, indicating that the SBP3 spores were richer in saturated fatty acids, and the protein structures of SBP3 and BHO spores were more aggregated and complex than those of BSU. SBP3 spores were more resistant (LD90 = 4.2 ± 0.3 min) to wet heat treatment (98 °C) than BHO (LD90 = 1.8 ± 0.2 min) and BSU (LD90 = 2.9 ± 0.5 min) spores were. In comparison to the untreated spores, the Raman spectra of the wet-heat-treated SBP3 spores showed minor variations in the bands that referred to proteins, whereas major changes were observed in the bands that referred to lipids and amide I in the heated BSU spores and to both lipids and proteins bands in the treated BHO spores. These results suggest that the major stability of SBP3 spore proteins could explain their greater resistance to wet heat compared to BHO and BSU. Our findings provide basic information for further comparative studies into spore responses to natural and laboratory stresses, which are useful in several different fields, such as astrobiology.

Magnetooptical Studies of Nanoparticle-Containing Borate Glasses

2010 ◽  
Vol 168-169 ◽  
pp. 525-528
Author(s):  
I.S. Edelman ◽  
O.S. Ivanova ◽  
R.D. Ivantsov
Keyword(s):  
Light Wave ◽  
Magnetic Circular Dichroism ◽  
Borate Glasses ◽  
Heat Treated ◽  
Optical Effects ◽  
Spectral Ranges ◽  
Glass Heat ◽  
Nanocomposite Structures ◽  
Different Origin ◽  
Co Doped

Faraday rotation (FR) and magnetic circular dichroism (MCD) of nanocomposite structures based on potassium-aluminum-germanium-boron glasses co-doped with Fe and rare earth (RE) or Y+Bi oxides have been studied. Formation of magnetic nanoparticles as a result of the glass heat treatment ensures them magnetic and magneto-optical properties typical of magnetically ordered substances. At the same time, glasses keep transparence in visual spectral range owing to low paramagnetic oxides concentration. FR and MCD spectra of the heat treated glasses are shown to be very close to those of γ-Fe2O3 and practically independent of the RE element nature for the light wave energies lower than 22000 cm-1. For higher energies, the MCD spectrum shape depends strongly on RE what evidences the different origin of magneto-optical effects in two spectral ranges.

Temperature-Controlled Devitrification of Oxyfluoride Borate Glasses

2007 ◽  
Vol 130 ◽  
pp. 263-266 ◽  
Author(s):  
Joanna Pisarska ◽  
Tomasz Goryczka ◽  
Wojciech A. Pisarski
Keyword(s):  
Heat Treatment ◽  
Glass Ceramics ◽  
Borate Glasses ◽  
X Ray Diffraction ◽  
Transparent Glass ◽  
X Ray ◽  
Heat Treated ◽  
Before And After ◽  
Controlled Crystallization ◽  
Temperature Controlled

Selected oxyfluoroborate glasses have been investigated before and after heat treatment. Transparent glass-ceramics (TGC) were obtained during controlled crystallization (devitrification). X-ray diffraction studies confirmed that material was partially crystallized. Diffraction lines due to orthorhombic PbF2 phase were identified for heat-treated samples at various temperatures and times. Results were compared to that ones obtained for as-melted glass.

Sign in / Sign up

Export Citation Format

Share Document