Raman Spectroscopy Study of the Tetragonal-to-monoclinic Transition in Zirconium Oxide Scales and Determination of Overall Oxygen Diffusion by Nuclear Microanalysis of O

2009 ◽  
pp. 416-416-21 ◽  
Author(s):  
J Godlewski ◽  
JP Gros ◽  
M Lambertin ◽  
JF Wadier ◽  
H Weidinger
Keyword(s):  
Raman Spectroscopy ◽  
Zirconium Oxide ◽  
Oxygen Diffusion ◽  
Oxide Scales ◽  
Spectroscopy Study ◽  
Nuclear Microanalysis

Raman spectroscopy study of edible oils and determination of the oxidative stability at frying temperatures

2014 ◽  
Vol 116 (11) ◽  
pp. 1451-1456 ◽  
Author(s):  
María Á. Carmona ◽  
Fernando Lafont ◽  
César Jiménez-Sanchidrián ◽  
José R. Ruiz
Keyword(s):  
Raman Spectroscopy ◽  
Oxidative Stability ◽  
Edible Oils ◽  
Spectroscopy Study

scholarly journals Phase transformation of the corrosion layers on nuclear fuel cladding. Raman spectroscopy study.

Paliva ◽  
2021 ◽  
pp. 113-117
Author(s):  
Kryštof Frank ◽  
Ladislav Lapčák ◽  
Jan Macák
Keyword(s):  
Raman Spectroscopy ◽  
Zirconium Oxide ◽  
Nuclear Reactors ◽  
Relative Proportion ◽  
Protective Layer ◽  
Zirconium Alloys ◽  
Corrosion Layer ◽  
Spectroscopy Study ◽  
Fuel Cladding ◽  
Nuclear Fuel Cladding

The goal of this work was the phase analysis of corrosion layers on zirconium alloys. In the environment of nuclear reactors, zirconium alloys are covered with a protective layer of zirconium oxide, which occurs in two crystalline modifications - monoclinic and tetragonal. The distribution of these phases in the corrosion layer can affect the overall corrosion rate. Raman spectroscopy was used to determine the composition of the corrosion layers. The use of this method is advantageous because the monoclinic and tetragonal phases can be easily distinguished in the spectra of the corrosion layers. In total, samples of two alloys were measured. The samples were pre-exposed at 360 °C in Li+ containing water (70 mg/l Li as LiOH) . Exposure times were between 21 d and 231 d, so the series contained both pre- and post- transition samples. The relative proportion of the tetragonal phase decreases significantly after the transient. It has also been found that the corrosion layers are highly heterogeneous in terms of the distribution of crystalline modifications.

Determination of the oxygen diffusion profile in polycrystalline lead selenide layers using nuclear microanalysis

2004 ◽  
Vol 38 (10) ◽  
pp. 1160-1163 ◽  
Author(s):  
A. E. Gamarts ◽  
V. M. Lebedev ◽  
V. A. Moshnikov ◽  
D. B. Chesnokova
Keyword(s):  
Oxygen Diffusion ◽  
Lead Selenide ◽  
Diffusion Profile ◽  
Nuclear Microanalysis

Determination of Human Coronary Artery Composition by Raman Spectroscopy

Circulation ◽  
1997 ◽  
Vol 96 (1) ◽  
pp. 99-105 ◽  
Author(s):  
James F. Brennan ◽  
Tjeerd J. Römer ◽  
Robert S. Lees ◽  
Anna M. Tercyak ◽  
John R. Kramer ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Coronary Artery ◽  
Human Coronary Artery

scholarly journals Raman spectroscopy study of the behavior of the soft mode in a structural phase transition in the Pr3Sb5O12 crystal

2015 ◽  
Vol 57 (11) ◽  
pp. 2286-2289 ◽  
Author(s):  
A. S. Oreshonkov ◽  
A. K. Khodzhibaev ◽  
A. S. Krylov ◽  
M. F. Umarov ◽  
A. N. Vtyurin
Keyword(s):  
Phase Transition ◽  
Raman Spectroscopy ◽  
Structural Phase Transition ◽  
Soft Mode ◽  
Structural Phase ◽  
Spectroscopy Study

Multivariate Analysis Aided Surface-Enhanced Raman Spectroscopy (MVA-SERS) Multiplex Quantitative Detection of Trace Fentanyl in Illicit Drug Mixtures Using a Handheld Raman Spectrometer

2021 ◽  
pp. 000370282110329
Author(s):  
Ling Wang ◽  
Mario O. Vendrell-Dones ◽  
Chiara Deriu ◽  
Sevde Doğruer ◽  
Peter de B. Harrington ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Principal Component ◽  
Surface Enhanced Raman Spectroscopy ◽  
Quantitative Detection ◽  
Least Squares Regression ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Current Screening

Recently there has been upsurge in reports that illicit seizures of cocaine and heroin have been adulterated with fentanyl. Surface-enhanced Raman spectroscopy (SERS) provides a useful alternative to current screening procedures that permits detection of trace levels of fentanyl in mixtures. Samples are solubilized and allowed to interact with aggregated colloidal nanostars to produce a rapid and sensitive assay. In this study, we present the quantitative determination of fentanyl in heroin and cocaine using SERS, using a point-and-shoot handheld Raman system. Our protocol is optimized to detect pure fentanyl down to 0.20 ± 0.06 ng/mL and can also distinguish pure cocaine and heroin at ng/mL levels. Multiplex analysis of mixtures is enabled by combining SERS detection with principal component analysis and super partial least squares regression discriminate analysis (SPLS-DA), which allow for the determination of fentanyl as low as 0.05% in simulated seized heroin and 0.10% in simulated seized cocaine samples.

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