5.2.4.9 Raman spectroscopy. IR spectroscopy

2005 ◽  
pp. 274-274
Author(s):  
E. Burzo
Keyword(s):  
Raman Spectroscopy ◽  
Ir Spectroscopy

scholarly journals О структуре тонких пленок монооксида германия

2020 ◽  
Vol 54 (12) ◽  
pp. 1296
Author(s):  
К.Н. Астанкова ◽  
В.А. Володин ◽  
И.А. Азаров
Keyword(s):  
Raman Spectroscopy ◽  
Ir Spectroscopy ◽  
Mixture Model ◽  
Atomic Structure ◽  
Photoelectron Spectroscopy ◽  
Mechanical Stresses ◽  
Electron Microscopic ◽  
X Ray ◽  
Random Mixture ◽  
Germanium Monoxide

By means of optical (Raman spectroscopy, IR spectroscopy, X-ray photoelectron spectroscopy) and electron microscopic methods, it was found that the atomic structure of stoichiometric germanium monoxide films corresponds to the random bonding model, without the formation of germanium nanoclusters. This structure is metastable and transforms into a structure which is close to random mixture model at a temperature 260 oC and higher. The metastability of solid GeO may be related to the presence of internal mechanical stresses in the atomic network.

scholarly journals Synthesis and characterization of new biodegradable gels based on 2,2 '-(ethylenedioxy) diethanethiol and pentaerythritol triacrylate

2022 ◽  
Vol 320 (1) ◽  
pp. 25-31
Author(s):  
R.A. Shulen ◽  
◽  
D.S. Kazybayeva ◽  
Keyword(s):  
Raman Spectroscopy ◽  
Ir Spectroscopy ◽  
Sol Gel ◽  
Polymer Network ◽  
Crosslinking Density ◽  
Mechanical Analysis ◽  
Synthesis And Characterization ◽  
Prolonged Release ◽  
Click Polymerization

The work is devoted to the synthesis and characterization of gels based on the monomers pentaerythritol triaacrylate (PETriA) and 2,2 '-(ethylenedioxy)diethanethiol (EDODET) by thiol-ene "click" polymerization. The properties of the obtained gels were investigated by IR, Raman spectroscopy, mechanical analysis. Sol-gel analysis of obtained networks was carried out and the degradability was investigated. The results of IR spectroscopy confirmed the presence of -C = O and -C-O-C- groups in the composition of the obtained gels. The presence of unreacted C = C bonds conjugated with C = O, as well as thiol groups, varies depending on the composition of the initial monomer mixture (IMM). Raman spectroscopy results correlate well with IR data. Raman spectra also show C-S, S-S and SH characteristic bands that are difficult to identify by IR spectroscopy. It was found that the composition of MM affects the physicochemical properties of the synthesized gels. The highest yield of the gel fraction of obtained polymers was found in samples with an equimolar composition of IMM. The analysis of mechanical properties showed that gels with an excess of PETriA exhibit more elastic properties, and an excess of EDODET leads to the formation of networks with a higher crosslinking density. The study of the ability of obtained PETria-EDODET gels to degrade in a 3% solution of hydrogen peroxide showed that the polymer network degrades by 12% within 60 days. This property of the obtained gels can find application in the creation of targeted drug delivery systems with their prolonged release.

scholarly journals Investigating Antibacterial Effects of Garlic (Allium sativum) Concentrate and Garlic-Derived Organosulfur Compounds on Campylobacter jejuni by Using Fourier Transform Infrared Spectroscopy, Raman Spectroscopy, and Electron Microscopy

2011 ◽  
Vol 77 (15) ◽  
pp. 5257-5269 ◽  
Author(s):  
Xiaonan Lu ◽  
Barbara A. Rasco ◽  
Jamie M. F. Jabal ◽  
D. Eric Aston ◽  
Mengshi Lin ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Raman Spectroscopy ◽  
Fourier Transform ◽  
Ir Spectroscopy ◽  
Campylobacter Jejuni ◽  
Cell Injury ◽  
Organosulfur Compounds ◽  
Content Type ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

ABSTRACTFourier transform infrared (FT-IR) spectroscopy and Raman spectroscopy were used to study the cell injury and inactivation ofCampylobacter jejunifrom exposure to antioxidants from garlic.C. jejuniwas treated with various concentrations of garlic concentrate and garlic-derived organosulfur compounds in growth media and saline at 4, 22, and 35°C. The antimicrobial activities of the diallyl sulfides increased with the number of sulfur atoms (diallyl sulfide < diallyl disulfide < diallyl trisulfide). FT-IR spectroscopy confirmed that organosulfur compounds are responsible for the substantial antimicrobial activity of garlic, much greater than those of garlic phenolic compounds, as indicated by changes in the spectral features of proteins, lipids, and polysaccharides in the bacterial cell membranes. Confocal Raman microscopy (532-nm-gold-particle substrate) and Raman mapping of a single bacterium confirmed the intracellular uptake of sulfur and phenolic components. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed to verify cell damage. Principal-component analysis (PCA), discriminant function analysis (DFA), and soft independent modeling of class analogs (SIMCA) were performed, and results were cross validated to differentiate bacteria based upon the degree of cell injury. Partial least-squares regression (PLSR) was employed to quantify and predict actual numbers of healthy and injured bacterial cells remaining following treatment. PLSR-based loading plots were investigated to further verify the changes in the cell membrane ofC. jejunitreated with organosulfur compounds. We demonstrated that bacterial injury and inactivation could be accurately investigated by complementary infrared and Raman spectroscopies using a chemical-based, “whole-organism fingerprint” with the aid of chemometrics and electron microscopy.

Surface Phases of TiO2 Nanoparticles Studied by UV Raman Spectroscopy and FT-IR Spectroscopy

2008 ◽  
Vol 112 (20) ◽  
pp. 7710-7716 ◽  
Author(s):  
Weiguang Su ◽  
Jing Zhang ◽  
Zhaochi Feng ◽  
Tao Chen ◽  
Pinliang Ying ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Ir Spectroscopy ◽  
Tio2 Nanoparticles ◽  
Uv Raman Spectroscopy ◽  
Surface Phases ◽  
Uv Raman ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

Exploring the Potential of Time-Resolved Photoluminescence Spectroscopy for the Detection of Plastics

2020 ◽  
Vol 74 (9) ◽  
pp. 1161-1166
Author(s):  
Sebastian Gies ◽  
Eva-Marie Schömann ◽  
Julia Anna Prume ◽  
Martin Koch
Keyword(s):  
Raman Spectroscopy ◽  
Ir Spectroscopy ◽  
Terrestrial Ecosystems ◽  
Photoluminescence Spectroscopy ◽  
Time Resolved ◽  
Plastic Materials ◽  
Photoluminescence Lifetime ◽  
Ft Ir ◽  
Time Resolved Photoluminescence ◽  
Ft Ir Spectroscopy

Accurate data on microplastic occurrence in aquatic and terrestrial ecosystems are a basic requirement for microplastic risk assessment and management. Existing analysis techniques like Raman spectroscopy and Fourier transform infrared (FT-IR) spectroscopy imaging are still time-consuming and depend on laborious sample preparation. Therefore, we investigate the potential of time-resolved photoluminescence spectroscopy as an alternative technique to identify plastic materials, and, for the first time determine the photoluminescence lifetime of a series of polymers and several non-plastic samples typically found in a marine environment. The obtained photoluminescence lifetimes can be used to distinguish between plastic and natural materials. Furthermore, they allow us to identify distinct types of plastics. Therefore, the described approach has the potential to identify materials either as a stand-alone technique or for pre-characterization of sample materials for otherwise time-consuming analytical methods such as Raman spectroscopy or FT-IR spectroscopy.

scholarly journals Extra-Framework Content in Sodalite-Group Minerals: Complexity and New Aspects of Its Study Using Infrared and Raman Spectroscopy

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 363 ◽  
Author(s):  
Nikita V. Chukanov ◽  
Marina F. Vigasina ◽  
Natalia V. Zubkova ◽  
Igor V. Pekov ◽  
Christof Schäfer ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Raman Spectroscopy ◽  
Structural Analysis ◽  
Ir Spectroscopy ◽  
Quantitative Method ◽  
Fluoride Anion ◽  
Spectroscopy Data ◽  
Group Mineral ◽  
X Ray ◽  
Infrared And Raman Spectroscopy

Nine samples of carbonate-free sodalite-group minerals, including those with abnormally high contents of polysulfide groups, fluoride anion and carbon dioxide molecules as well as synthetic fluoraluminate sodalite-type compound Na8(Si7Al5O24)(AlF6)3–·5H2O, have been studied by means of electron microprobe analyses, infrared and Raman spectroscopy; the CO2 content was determined using the selective sorption of gaseous ignition products. This article describes a semi-quantitative method for estimating the content of carbon dioxide molecules in these minerals, based on IR spectroscopy data. The data obtained demonstrate the existence of a sulfide sodalite-group mineral with the idealized formula Na7(Si6Al6O24)(S3−)·H2O, which differs significantly from the formula Na6Ca2(Si6Al6O24)S2–2 accepted for lazurite. According to single-crystal X-ray structural analysis, in the F-rich sodalite-group mineral from the Eifel paleovolcanic region, Germany with the idealized formula Na7(Si6Al6O24)F−·nH2O fluorine occurs as an isolated F− anion, unlike synthetic F-rich sodalite-type compounds.

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