Temat: spectroscopy FTIR - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Study of CuO and V2O5 Effect on IR Spectra of Polycrystalline Bismuth Niobate
Autorzy:: Kuźniarska-Biernacka, I.
Lisińska-Czekaj, A.
Czekaj, D.
Powiązania:: https://bibliotekanauki.pl/articles/352587.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: BiNbO4
ceramics
SEM
FTIR spectroscopy
Opis:: Bismuth niobate (BiNbO₄) ceramics were fabricated by mixed oxide method and sintered by presureless sintering method. BiNbO₄ ceramics doped with V₂ O₅ additive in amount 0.125 wt%, 0.250 wt% and 1 wt% of was sintered at T = 910°C whereas BiNbO₄ ceramics doped with 2 wt% of CuO additive was sintered at T = 890°C and T = 910°C. It was found that V₂ O₅ additive improved morphology of the ceramic samples. However, the chemical composition of BiNbO₄ ceramics in relation to bismuth oxide and niobium oxide manifested a tendency of lack of Bi₂ O₃ component. Absorption bands for the BiNbO₄ compound were identified. FTIR band positions associated with NbO₆ octahedra suggested that the crystal structure changes after V₂ O₅ incorporation.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 2; 817-821
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Structural Changes in the Furan Resins by UV Radiation and Atmospheric Air
Autorzy:: Bobrowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/381893.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: furan resins
furfuryl alcohol
structural changes
spectroscopy FTIR
spectrum FTIR
żywice furanowe
alkohol furfurylowy
zmiany strukturalne
spektroskopia FTIR
widma FTIR
Opis:: In this paper, the results of research of structural changes that occur during in furan resins with different content of furfuryl alcohol by UV radiation and atmospheric air are presented. The research was carried out by transmission method (KBr pellets), using FTIR spectrometer Excalibur 3000 for the three samples of furan resins with different content of furfuryl alcohol. As a result of UV radiation and oxidizing atmosphere only the sample of the resin Kaltharz 8616 remained liquid. Two others (Kaltharz U 404 and Kaltharz 8117) were cured after 1
Źródło:: Archives of Foundry Engineering; 2015, 15, 1 spec.; 5-8
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Assessment of poultry eggs freshness using FTIR spectroscopy combined with HCA and PCA methods
Autorzy:: Michalczyk, E.
Kurczab, R.
Powiązania:: https://bibliotekanauki.pl/articles/93132.pdf
Data publikacji:: 2018
Wydawca:: Państwowa Wyższa Szkoła Zawodowa w Tarnowie
Tematy:: egg freshness
FTIR spectroscopy
chemometrics
świeżość jaja
spektroskopia FTIR
chemometria
Opis:: The main aim of this study was to investigate the use of Attenuated Total Reflection Fourier Transform Infrared Spectroscopy (ATR FTIR) and selected chemometric methods to classify eggs in terms of the laying hen farming method, as well as to identify changes in the individual egg compositions during storage. In total, 50 eggs were used for the study; 10 eggs per classes: 0, 1, 2, 3 and rural. Eggs were stored by 29 days period, which was divided on the 10 measuring days in which one egg from each class was tested by recording two FTIR spectra for the shell, albumen and egg yolk. The chemometric analysis, including Hierarchical Cluster Analysis (HCA) and the Principal Component Analysis (PCA), was performed based on the recorded FTIR spectra. Changes in chemical composition during the experiment in individual egg elements were analyzed. Furthermore, by analyzing the graphs (HCA and PCA) obtained by the chemometric analysis, it was noted that the largest changes in the chemical composition of eggs occurred in the shell and yolk, while in the albumen it was less insignificant. The chemometric analysis of the recorded spectra also showed that combination of chemometric methods and FTIR spectroscopy can potentially be used to develop a non-destructive method for classifying eggs in terms of the hen culture method and to monitor of their freshness.
Źródło:: Science, Technology and Innovation; 2018, 2, 1; 7-12
2544-9125
Pojawia się w:: Science, Technology and Innovation
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Influence of palladium chemical structure on hydrogen sensing properties of carbonaceous–palladium thin films
Autorzy:: Kaminska, A.
Krawczyk, S.
Kozlowski, C.
Powiązania:: https://bibliotekanauki.pl/articles/173783.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: C–Pd thin films
hydrogen sensor
FTIR spectroscopy
Opis:: In this work we investigate nanocomposite carbonaceous–palladium (C–Pd) films prepared by physical vapor deposition. Such films are promising materials for hydrogen sensor applications. This is related to the highly selective hydrogen absorption by palladium nanocrystallites. The C–Pd films obtained in various technological conditions differ in structure and electrical properties. These films were characterized by SEM, EDS and FTIR spectroscopy. FTIR spec-troscopy was used to determine the amount of palladium acetate and fullerene, incompletely decomposed during the deposition process. FTIR spectra enabled us to explain the differences in C–Pd films resistance based on palladium chemical structure. The possibility of the application of C–Pd films as active layers in hydrogen sensors was also studied. The results showed that synthesized C–Pd films containing palladium nanograins could be used for hydrogen sensing.
Źródło:: Optica Applicata; 2013, 43, 4; 633-640
0078-5466
1899-7015
Pojawia się w:: Optica Applicata
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Variation of the cholesterol content in breast milk during 10 days collection at early stages of lactation
Autorzy:: Kamelska, Anna
Pietrzak-Fiećko, Renata
Bryl, Krzysztof
Powiązania:: https://bibliotekanauki.pl/articles/1039741.pdf
Data publikacji:: 2012
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: FTIR-ATR spectroscopy
human milk
cholesterol variations
Opis:: More and more research is done concerning nutritional programming. Human milk nutrients which are consumed by infants can influence their health in later life. High level of cholesterol in human milk paradoxically lowers the cholesterol concentration in blood in adults. During the course of human lactation the cholesterol concentration decreases from 31 mg/100cm3 (colostrum) to 16 mg/100 cm3 (mature milk). According to Scopesi et al., 2002, Clin Nutr 21: 379-384, cholesterol concentration in mature milk ranged from 6.5 to 18.4 mg/100 cm3. The aim of the study was to assess the variations in breast milk cholesterol content during 10 day collection at early lactation. 48 samples of human milk were analyzed. Mean age of women was 31 years. Women were collecting samples during 10 days of an early lactation stage (1-3 months after delivery). An Attenuated Total Reflectance Fourier Transformed Infrared (FTIR-ATR) method for easy and rapid determination of cholesterol in human milk was elaborated. Cholesterol content assessed by the FTIR method ranged from 3.36 to 12.98 mg/100 cm3. Results indicate that milk cholesterol concentration during 10 consecutive days of early lactation is highly variable. Cholesterol content depends on an individual. Therefore it is suggested that not only the period of lactation but also mother's diet, age, season and place of residence are important factors determining cholesterol content.
Źródło:: Acta Biochimica Polonica; 2012, 59, 2; 243-248
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Badanie zjawiska pseudoplastyczności i tiksotropii smarów litowych z wykorzystaniem spektroskopii ATR-FTIR
Experimental studies on pseudoplastic and thixotropic properties of lithium greases with ATR-FTIR spectroscopy
Autorzy:: Paszkowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/189240.pdf
Data publikacji:: 2009
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: smar plastyczny
tiksotropia
spektroskopia ATR-FTIR
grease
thixotropy
ATR-FTIR spectroscopy
Opis:: W pracy zbadano za pomocą spektrofotometru ATR-FTIR zjawisko pseudoplastyczności i tiksotropii smarów plastycznych zagęszczanych 12-hydroksystearynianem litu na bazie oleju mineralnego. Autor dokonał jakościowej oceny oddziaływań fizykochemicznych występujących między flokułami mydła litowego, a także zaproponował schemat kierunkowania się asocjatów 12-hydroksystearynianu litu podczas ścinania smaru oraz ich agregacji i flokulacji w fazie relaksacji smaru.
The paper deals with experimental studies on pseudoplastic and thixotropic properties of lubricating greases with ATR-FTIR spectroscopy. The research was done on lithium greases thickened by lithium 12-hydroxystearate with mineral base oil. The molecular bonds between dispersed particles of lithium soap during the shearing process and the relaxation of grease were identified.
Źródło:: Tribologia; 2009, 2; 139-149
0208-7774
Pojawia się w:: Tribologia
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Modification of Optical, Electronic and Microstructural Properties of PET by 150 keV Cs+ Irradiation
Autorzy:: Musiatowicz, Michał
Turek, Marcin
Droździel, Andrzej
Pyszniak, Krzysztof
Grudziński, Wojciech
Powiązania:: https://bibliotekanauki.pl/articles/2206284.pdf
Data publikacji:: 2022
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: polymer modification
PET
ion implantation
FTIR spectroscopy
Raman spectroscopy
conducting layer
Opis:: Thick (0.125 mm) sheet samples of PET were irradiated with 150 keV Cs+ ion beam with fluences in the range from 10^13 cm^-2 up to 10^16 cm^-2). Raman and UV-VIS spectroscopy measurements shown destruction of numerous bonds within the polymer – this effect intensifies with fluence. Raman spectroscopy shows the presence of amorphous graphitelike structures as the broad G band appears in the collected spectrum. The analysis of absorbance spectra also confirms formation of numerous carbon clusters leading to a formation of vast conducting structures in the modified layer of the polymer. One can observe the decrease of optical bandgap from 3.85 eV (typical for pristine PET) to 1.05 eV for the sample implanted with the highest fluence, the effect is weaker than for lighter alkali metal ions. The estimated average number of C atom in a clusters reaches in such case values close to 1100. The changes in the polymer structure lead to intense reduction of electrical sheet resistivity of the modified samples by ~ 8 orders of magnitude in the case of severely modified sample. The dependence of resistivity on temperature has also been measured. The plots of ln(σ) vs 1/T show that band conductivity or nearest neighbor hopping between conducting structures prevail in the considered case
Źródło:: Advances in Science and Technology. Research Journal; 2022, 16, 5; 11-19
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Badania z wykorzystaniem spektroskopii FTIR żeli i powłok z układu Al2O3-TiO2-SiO2
The FTIR studies of gels and thin films of Al2O3-TiO2-SiO2 systems
Autorzy:: Adamczyk, A.
Długoń, E.
Powiązania:: https://bibliotekanauki.pl/articles/284944.pdf
Data publikacji:: 2009
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: spektroskopia FTIR
metoda zol-żel
biomateriały
FTIR spectroscopy
sol-gel method
biomaterials
Opis:: W pracy zajęto się badaniami próbek monolitycznych oraz powłok z układu Al2O3-TiO2-SiO2, wykorzystując do syntezy metodę zol-żel. Żele były wygrzewane w różnych temperaturach (500oC, 850oC oraz 1100oC) odpowiadających temperaturom wygrzewania cienkich filmów na różnego typu podłożach. Powłoki były nanoszone poprzez zanurzanie próbek, a następnie ich wynurzanie ze stałą prędkością z odpowiedniego zolu. Powłoki glinowo-tytanowo-krzemionkowe nanoszono w ten sposób na podłoża węglowe, ze stali oraz na stop tytanowy. Wszystkie otrzymane próbki badano, wykorzystując spektroskopię FTIR, dyfrakcję rentgenowską XRD oraz mikroskopię elektronową SEM wraz z mikroanalizą rentgenowską EDS. We wszystkich widmach IR można było wyróżnić pasma pochodzące od drgań rozciągających grupy OH (przy około 3432-3672 cm-1) oraz pasma przypisane drganiom zginającym w cząsteczkach H2O (przy 1630 cm-1), co może być wynikiem zastosowania metody zol-żel do syntezy. Intensywność wymienionych pasm maleje w miarę wygrzewania próbek. W widmach IR próbek z układu Al2O3-TiO2-SiO2zaobserwowano dodatkowo obecność pasm pochodzących od drgań połączeń Si-O oraz Al-O.
In this work, samples of Al2O3-TiO2-SiO2system, in the form of bulk ones and thin films were obtained using the sol-gel method. The bulk samples were heated at different temperatures (500oC, 850oC and 1100oC) corresponding to the annealing process of coatings, deposited on different substrates by dipping and pulling out samples from the proper sol with the stable speed. Thin films of Al2O3-TiO2-SiO2system were deposited on carbon, steel and titanium alloy substrates. All bulk samples were studied by the FTIR spectroscopy and the X-ray diffractometry while thin films were also investigated by the electron microscopy together with the EDS method. In all IR spectra measured, the bands assigned to the stretching vibrations of OH groups (at about 3432-3672 cm-1) together with the bending vibrations in H2O molecules (at about 1630 cm-1) are observed, what is connected with the sol-gel synthesis. The intensity of all those bands decreases during an annealing process. In the IR spectra of samples of Al2O3-TiO2-SiO2system the presence of bands assigned to the Si-O bond vibrations and bands due to Al-O bond vibrations are observed.
Źródło:: Engineering of Biomaterials; 2009, 12, 88; 24-27
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Detonation nanodiamond particles modified by non-steroidal anti-inflammatory drugs in vitro examination
Autorzy:: Mitura, K.
Wilczek, P.
Niemiec-Cyganek, A.
Morenc, M.
Dudek, M.
Sobczyk-Guzenda, A.
Fraczyk, J.
Kolesińska, B.
Powiązania:: https://bibliotekanauki.pl/articles/284974.pdf
Data publikacji:: 2017
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: detonation nanodiamond particles
chemical modification
anti-inflammatory drugs
FTIR spectroscopy
mouse fibroblasts
Opis:: Most recently it has been found that nanodiamond particles have very interesting properties. There are number of research communications that detonation nanodiamond particles (NDPs) are fairly reactive and their surface can be effectively modified by chemical methods. The hydroxyl-modified NDPs were obtained by Fenton reaction, amine-functionalized NDPs were obtained by chemical reduction of the nitro- -functionalized surface and carboxyl-modified NDPs by oxidation by using H2O2 under acidic conditions. NDPs functionalized by hydroxyl- and amine- groups and amino groups were used for covalent binding of non-steroidal anti-inflammatory pharmaceuticals (aspirin, ketoprofen, ibuprofen, naproxen) via ester or amide bonds. These results of the studies proved the activity of the conjugates of active substance-NDP and study the rate of release of active substance from the NDPs surface by in vitro examinations with mouse fibroblasts. The progress of the reaction and the characteristics of the products were determined by using FT-IR. Chemical and physical structures of materials were also investigated by Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS). DRIFT spectra show the modification of nanodiamond by ketoprofen, naproxen, ibuprofen and aspirin.
Źródło:: Engineering of Biomaterials; 2017, 20, 140; 12-20
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Fabrication of Dye Sensitized Solar Cell Based on Natural Photosensitizers
Autorzy:: Nirmala, M.
Sahana, S.
Iswarya, B.
Maruvarasi, K.
Jenita, A. Adline
Kavitha, B.
Powiązania:: https://bibliotekanauki.pl/articles/1031877.pdf
Data publikacji:: 2020
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Efficiency
FTIR spectroscopy
Functional
Natural Dyes
Solar cell
nanocrystalline materials
nanocrytalline titanium dioxide
Opis:: Dye Sensitized solar cells were fabricated using with natural extracts and TiO2 is used as a semiconducting layer. The layer of nanocrytalline titanium dioxide was deposited on conductive side of the transparent Fluorine doped Tin Oxide (FTO) glass plate and the other side of the plate is coated with graphite. Voltage and Current values are measured for natural dyes coated FTO plate and I-V characteristic curves of all fabricated cells were drawn and analyzed. The highest power conversion efficiencies of Blueberry (0.79872%) and Beetroot (0.745813 %.) dyes were achieved among 10 dyes. The functional groups of Beetroot and Turmeric natural dyes were confirmed under FTIR spectroscopy. The ease and cost efficiency of the overall fabrication process, extensive availability of these fruits/juices render them novel and low-cost candidates for Solar cell applications.
Źródło:: World Scientific News; 2020, 149; 128-139
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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