scholarly journals Surface Characterization of High Temperature Metal Alloys Using FT-IR Reflectance Spectroscopy

1980 ◽  
Author(s):  
David Ottesen ◽  
Alan Nagelberg
Keyword(s):  
High Temperature ◽  
Surface Characterization ◽  
Reflectance Spectroscopy ◽  
Metal Alloys ◽  
Ir Reflectance ◽  
Ft Ir

scholarly journals Characterization of conichalcite by SEM, FTIR, Raman and electronic reflectance spectroscopy

2005 ◽  
Vol 69 (2) ◽  
pp. 155-167 ◽  
Author(s):  
B. J. Reddy ◽  
R. L. Frost ◽  
W. N. Martens
Keyword(s):  
Near Infrared ◽  
Adsorbed Water ◽  
Reflectance Spectroscopy ◽  
Sem Images ◽  
X Ray ◽  
Near Ir ◽  
Ir Reflectance ◽  
Yavapai County ◽  
Ir Bands

AbstractThe mineral conichalcite from the western part of Bagdad mine, Bagdad, Eureka District, Yavapai County, Arizona, USA has been characterized by electronic, near-infrared (NIR), Raman and infrared (IR) spectroscopy. Scanning electron microscopy (SEM) images show that the mineral consists of bundles of fibres. Calculations based on the results of the energy dispersive X-ray analyses on a stoichiometric basis show the substitution of arsenate by 12 wt.% of phosphate in the mineral. Raman and IR bands are assigned in terms of the fundamental modes of AsO43− and PO43− molecules and are related to the mineral structure. Near-IR reflectance spectroscopy shows the presence of adsorbed water and hydroxyl units in the mineral. The Cu(II) coordination polyhedron in conichalcite can have at best pseudo-tetragonal geometry. The crystal field and tetragonal field parameters of the Cu(II) complex were calculated and found to agree well with the values reported for known tetragonal distortion octahedral complexes.

Study on Synthesis and Characterization of Unsaturated Polyester by Enzyme-Catalyzed

2013 ◽  
Vol 575-576 ◽  
pp. 67-70
Author(s):  
Fen Juan Shao ◽  
Qun Yang ◽  
Lan Ying Li ◽  
Da Nian Lu
Keyword(s):  
High Temperature ◽  
Unsaturated Polyester ◽  
Soxhlet Extraction ◽  
Side Chain ◽  
Synthesis And Characterization ◽  
Cross Linking ◽  
Cross Link ◽  
H Nmr ◽  
Ft Ir

Unsaturated polyester was prepared with adipic acid (AA), fumaric acid (FA), itaconic acid (IA) and 1, 6-hexanediol (HD) by enzyme-catalyzed polmerization. The insoluble gel fraction (Qs), as the cross-linking degree of cured unsaturated polyesters which could be self-cross-linked at high temperature through C=C in it, was got by Soxhlet Extraction. The properties were investigated by FT-IR, 1H NMR, DSC, XRD and so on. The results indicated that the C=C in unsaturated diacids reduced the acitvity of N435, which affected the polmerization. With the introduction of C=C of IA or FA, the Mn of polyester reduced. The C=C could self-cross-link under high temperature for lengthy time. The higher the temperature and the longer the time, the Qs increased. As the C=C of IA was in the side chain, it could move easily. Then Qs of poly (AA-co-IA-co-HD) was higher than ploy (AA-co-FA-co-HD). With the increased content of unsaturated diacid, Qs increased. And the biodegradation of cross-linked polyesters became worse.

Surface characterization of medieval silver coins minted by the early Piasts: FT-IR mapping and SEM/EDX studies

2017 ◽  
Vol 50 (1) ◽  
pp. 78-86 ◽  
Author(s):  
Ewa Pięta ◽  
Janusz Lekki ◽  
Julio M. del Hoyo-Meléndez ◽  
Czesława Paluszkiewicz ◽  
Michał Nowakowski ◽  
...  
Keyword(s):  
Surface Characterization ◽  
Ft Ir

scholarly journals Characterization of magnetic biochar amended with silicon dioxide prepared at high temperature calcination

2016 ◽  
Vol 34 (3) ◽  
pp. 597-604 ◽  
Author(s):  
Shams Ali Baig ◽  
Zimo Lou ◽  
Malik T. Hayat ◽  
Ruiqi Fu ◽  
Yu Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Silicon Dioxide ◽  
Environmental Remediation ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Magnetic Biochar ◽  
Ft Ir ◽  
High Temperature Calcination

AbstractCalcination is considered to increase the hardness of composite material and prevent its breakage for the effective applications in environmental remediation. In this study, magnetic biochar amended with silicon dioxide was calcined at high temperature under nitrogen environment and characterized using various techniques. X-ray diffraction (XRD) analysis revealed elimination of Fe3O4 peaks under nitrogen calcination and formation of Fe3Si and iron as major constituents of magnetic biochar-SiO2 composite, which demonstrated its superparamagnetic behavior (>80 A2·kg−1) comparable to magnetic biochar. Thermogravimetric analysis (TGA) revealed that both calcined samples generated higher residual mass (>96 %) and demonstrated better thermal stability. The presence of various bands in Fourier transform infrared spectroscopy (FT-IR) was more obvious and the elimination of H–O–H bonding was observed at high temperature calcination. In addition, scanning electron microscopy (SEM) images revealed certain morphological variation among the samples and the presence of more prominent internal and external pores, which then judged the surface area and pore volume of samples. Findings from this study suggests that the selective calcination process could cause useful changes in the material composites and can be effectively employed in environmental remediation measures.

High temperature thermal extraction of xianfeng lignite and FT-IR characterization of its extracts and residues

2011 ◽  
Vol 39 (6) ◽  
pp. 401-406 ◽  
Author(s):  
Zhi-cai WANG ◽  
Liang LI ◽  
Heng-fu SHUI ◽  
Zhi-ping LEI ◽  
Shi-biao REN ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Extraction ◽  
Ft Ir
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