ir fourier spectroscopy
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2021 ◽  
Vol 24 (3) ◽  
pp. 272-276
Author(s):  
Yu.Yu. Bacherikov ◽  
◽  
M.N. Mirzayev ◽  
A.G. Zhuk ◽  
O.B. Okhrimenko ◽  
...  

Possibility to prepare finely dispersed Cu2ZnSnS4 by using the method of self-propagating high-temperature synthesis has been studied in this work. Investigations of Raman scattering and IR-Fourier spectroscopy of the synthesized finely dispersed material have been carried out. The analysis of the Raman and IR-Fourier spectra showed that the synthesized material in the process of preparing is formed with a kesterite structure with the inclusion of a certain amount of secondary phases in the form of sulfides and stannites.


Author(s):  
В.А. Демин ◽  
Е.У. Ипатова ◽  
Л.М. Пахучая

Методом ИК Фурье спектроскопии в пределах одного ствола были изучены изменения древесины cосны обыкновенной (Pínus sylvéstris) в результате ее биологического поражения и деструкции окаймленным трутовиком – грибом Fomitopsis pinicola (Schw. ex Fr.) Karst. Исследование проводили на спектрометре Prestige-21 фирмы Shimadzu в области волновых чисел 4000– 400 см–1 с разрешением 4 см–1 (20 сканов). Спектры поглощения снимали с использованием приставки диффузионного отражения (ДО). Показано, что биодеструкция древесной ткани сосны отражается на ИК Фурье спектрах. Изменения наблюдаются в областях спектра поглощения, характеризующих валентные колебания гидроксильных, метиленовых, карбонильных групп, скелетные колебания ароматического кольца. Глубокая деструкция древесины в центре ствола сопровождается батохромным сдвигом (1734 см–1 до 1719 см–1) и значительным увеличением интенсивности полосы поглощения валентных колебаний карбонильных групп (1719 см–1), а также изменением контура спектра поглощения в области от ~1719 до ~1100 см–1. В спектре деструктированной древесины интенсивности полос поглощения в этой области уменьшаются, в спектрах образцов с периферии и центра ствола, сохранивших морфологическую структуру древесины – увеличиваются. В деструктированной древесине отмечено существенное увеличение интенсивности полосы поглощения при 1601 см–1, которая становится несколько большей, чем интенсивность полосы с максимумом 1508 см–1, что не характерно для ИК спектра здоровой хвойной древесины, в которой отношение интенсивностей этих полос поглощения противоположное. Сhanges of the Scots pine wood (Pínus sylvéstris) within a single tree trunk caused by its biological destruction made by red belt fungus Fomitopsis pinicola (Schw. ex Fr.) Karst were studied by use of the IR Fourier spectroscopy method. The wood was cut in Syktyvdin region of the Komi Republic. From the trunk about 36 сm in diameter a sample was sawed about 15 cm thick. Three samples were selected for spectra: 1 – light brown non-destructed wood from the centre of the trunk, 2 – dark brown, adjacent to the completely destroyed wood; 3 – from the periphery of the trunk not clearly affected by rot. The research was made by use of spectrometer Prestige-21 produced by Shimadzu company in the field of the wave numbers 4000–400 сm–1 with a resolution of 4 cm–1 (20 scans). Absorption spectra were examined by using a diffusion reflector (DR). It is shown that bio destruction of the wood fiber of pine is reflected on the IR Fourier spectra. Changes are observed in the absorption spectrum that characterize the valence oscillations of hydroxyl, methylene, carbonyl groups, and skeletal oscillations of the aromatic ring. A deep destruction of wood in the centre of the trunk is accompanied by a bathwater drift (1734 сm–1 to 1719 сm–1) and a significant increase in the absorption band of the valence oscillations of carbonyl groups (1719 сm–1), as well as change of the spectra contour of the absorption from ~1719 to ~1100 cm–1. In the spectrum of the disrupted wood, the intensity of the absorption bands in this area decreases, and in the spectra of the samples from the periphery and the center of the trunk that have preserved the morphological structure of the wood increases. There is a significant increase in the absorption band in the disrupted wood 1601 сm–1, that becomes bigger than, band intensity maximum 1508 сm–1, that is not typical for the IR spectrum of healthy coniferous wood, in which the ratio of the intensity of these absorption bands is the opposite.


2020 ◽  
Vol 7 (4) ◽  
pp. 180-185
Author(s):  
L. A. Yakovishin ◽  
V. I. Grishkovets

The 1:1 molecular complex of licorice triterpene glycoside glycyrrhizic acid (in the form of monoammonium salt) with cholesterol was obtained in 80% aqueous isopropyl alcohol for the first time. The complexation was studied by 13C NMR, UV, and ATR IR-Fourier spectroscopy. The hydrogen bonds and hydrophobic interactions are formed in the molecular complex.


2020 ◽  
Vol 7 (4) ◽  
pp. 150-153
Author(s):  
L. A. Yakovishin ◽  
V. I. Grishkovets ◽  
E. N. Korzh ◽  
I. V. Golovchenko ◽  
A. A. Nagirnyak

The 1:1 molecular complex of ivy triterpene glycoside hederasaponin C (HedC) with cholesterol (Chol) was obtained in aqueous isopropyl alcohol. The stability constant of (3.3 ± 0.7)∙106 (mol/L)–1 was calculated for the complex. The complexation was studied by UV- and ATR IR-Fourier spectroscopy, and method of isomolar series. The hydrogen bonds and hydrophobic interactions are formed in the molecular complex.


2020 ◽  
Vol 11 (4) ◽  
pp. 919-924
Author(s):  
G. A. Gorbacheva ◽  
A.V. Bazhenov ◽  
I. Shukhanova ◽  
V. G. Sanaev

2020 ◽  
Vol 13 (3) ◽  
pp. 274-281 ◽  
Author(s):  
I. V. Gordeeva ◽  
Yu. A. Naumova ◽  
V. G. Nikolskii ◽  
I. A. Krasotkina ◽  
T. V. Dudareva

2019 ◽  
Vol 104 ◽  
pp. 102944 ◽  
Author(s):  
Lyudmila V. Bel’skaya ◽  
Elena A. Sarf ◽  
Denis V. Solomatin ◽  
Victor K. Kosenok

2019 ◽  
Vol 126 (2) ◽  
pp. 177
Author(s):  
И.Ю. Денисюк ◽  
К.Ю. Логушкова ◽  
М.И. Фокина ◽  
М.В. Успенская

AbstractMultilayer graphene has been obtained by ultrasonic splitting of graphite microparticles in a surface-active solvent that is a mixture of nonane and water and a surface-active surfactant, which provides dispersion of graphene in hydrophilic systems, has been selected. The chemical structure of the obtained materials has been investigated by IR Fourier spectroscopy. Possible mechanisms of the influence of inorganic surfactants (sodium liquid glass) on the graphene, the type of relations that arise between it and the graphene surface, and possible areas of its application have been discussed.


Author(s):  
Анна Якубовна Мазина

Для выявления технологических особенностей Жалованной грамоты Петра I были проведены оптико-физические (ИК-рефлектография, микроскопическое исследование с последующей фотофиксацией), а также комплексные физико-химические исследования проб основы, красочных слоев, связующих. Использованы методы микроскопии в отраженном свете, микрохимии, ретгенофлюоресцентного анализа, ИК Фурье спектроскопии, морфологического анализа для определения материалов по волокну. На основании полученных данных была разработана реставрационная программа. На первом этапе выполнен демонтаж грамоты, включающий отделение тканевой обложки со шнурами и печатью от пергаментных листов с текстом. In order to identify the technological features of the Letters patent by Peter I, optical-physical (IR reflectography, microscopic examination and subsequent photo-recording), as well as complex physical and chemical studies of samples of the base, colorful layers, binders were carried out. The methods included microscopy in reflected light, microchemistry, x-ray fluorescence analysis, IR-Fourier spectroscopy, morphological determination of the materials of the certificate and the cover of the fiber. Based on the data obtained, a restoration program was developed. At the first stage of the conservation, the dismantling of the certificate was carried out, including the separation of the fabric cover with cords from parchment sheets with text.


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