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Tytuł:
A Study on the Synthesis of Lithium Carbonate (Li2CO3) from Waste Acidic Sludge
Autorzy:
Choi, Dong Hyeon
Wang, Jei-Pil
Powiązania:
https://bibliotekanauki.pl/articles/351124.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lithium carbonate
thermogravimetric apparatus
lithium sulfate
carbon dioxide
Opis:
In this study, the synthesis of lithium carbonate (Li2 CO3 ) powder was conducted by a carbonation process using carbon dioxide gas (CO2 ) from waste acidic sludge based on sulfuric acid (H2 SO4 ) containing around 2 wt.% lithium content. Lithium sulfate (Li2 SO4 ) powder as a raw material was reacted with CO2 gas using a thermogravimetric apparatus to measure carbonation conditions such as temperature, time and CO2 content. It was noted that carbonation occurred at a temperature range of 800°C to 900°C within 2 hours. To prevent further oxidation during carbonation, calcium sulfate (CaO4 S) was first introduced to mixing gases with CO2 and Ar and then led to meet in the chamber. The lithium carbonate obtained was examined by inductively coupled plasma–mass spectroscopy (ICP-MS), X-ray diffraction (XRD) and scanning electron microscopy (SEM) and it was found that of lithium carbonate with a purity above 99% was recovered.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 4; 1351-1355
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania właściwości zeolitów otrzymywanych z popiołów lotnych pod kątem wykorzystania ich jako sorbentów CO2
Testing of zeolite obtained from fly ash for use as CO2 sorbent
Autorzy:
Wdowin, M.
Panek, R.
Franus, W.
Powiązania:
https://bibliotekanauki.pl/articles/282582.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
Tematy:
popiół lotny
synteza zeolitów
CO2
CCS
fly ash
synthesis of zeolite
Opis:
W pracy przedstawiono charakterystykę mineralogiczno-teksturalną oraz wstępne wyniki sorpcji CO2 syntetycznych materiałów zeolitowych otrzymanych z popiołu lotnego klasy F w wyniku reakcji hydrotermalnej. Jako produkty reakcji otrzymano trzy typy materiałów zeolitowych: Na-X, Na-P1, Na-A. Materiał porównawczy stanowił zeolit naturalny – klinoptilolit ze złoża Sokirnica (Ukraina). W celu zwiększenia chłonności sorpcyjnej względem ditlenku węgla badane materiały poddano aktywacji organicznej, wykorzystując w tym celu polietylenoiminę (PEI). Na aktywowanych i wyjściowych materiałach przeprowadzono analizy XRD oraz SEM-EDS na potrzeby określenia wpływu aktywacji na strukturę badanych zeolitów oraz przeprowadzono eksperymenty sorpcji CO2 w warunkach statycznych. Badania wykazały, że PEI nie zmienia składu mineralnego badanych zeolitów – jedynie tworzy formy tzw. „polew” (bezpostaciowych nagromadzeń) na powierzchniach badanych materiałów. Eksperymenty sorpcji dały lepsze wyniki chlonności sorpcyjnej CO2 dla zeolitów aktywowanych PEI (nawet sześciokrotnie). Najlepsze wyniki zanotowano dla zeolitu Na-X z PEI, gdzie chłonność sorpcyjna zachowała się na poziomie 2,6 mmol/g, co jest jednak zbyt niskim wynikiem, aby zastosować te materiały w skali technicznej. Dlatego konieczne są dalsze poszukiwania metod modyfikacji celem zwiększenia chlonności badanego materiału względem CO2.
This paper presents the mineralogical and textural characteristics – as well as preliminary results of determining the CO2 sorption capacity – of synthetic zeolite materials derived from F class fly ash in hydrothermal reactions. Concerning the reaction products, three types of zeolite materials were obtained as follows: Na-X, Na-P1, and Na-A. The comparative material was a natural zeolite-clinoptilolite from the Sokirnica deposit (Ukraine). In order to enhance the sorption capacity of the tested zeolites with respect to carbon dioxide, they were activated by means of the organic compound polyethyleneimine (PEI). The untreated and activated materials were examined by XRD, SEM-EDS analysis for the purpose of determining the effect of activation on the structure of the zeolites. For all zeolites, CO2 sorption experiments were performed under static conditions. The studies showed that the PEI did not change the mineral composition of the zeolites; it only created a form of coating on the surfaces of the tested materials. Sorption capacity experiments showed better results for the CO2 sorption of PEI activated zeolite (up to six times higher). The best results were noted for the Na-X zeolite with PEI, where sorption capacity was at a level of 2.6 mmol/g, though it is too low a result to apply these materials on an industrial scale. Therefore, the need for further modification methods is necessary to increase the CO2 sorption capacity of the tested materials.
Źródło:
Polityka Energetyczna; 2014, 17, 4; 329-338
1429-6675
Pojawia się w:
Polityka Energetyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CaO-based high temperature CO2 sorbents – Literature review
Autorzy:
Konopacka-Łyskawa, Donata
Czaplicka, Natalia
Szefer, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2086811.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
carbon dioxide
Ca-based sorbents
synthesis methods
sorbent regeneration
Ca-looping
dwutlenek węgla
Sorbenty na bazie Ca
metoda syntezy
regeneracja sorbentu
Ca-pętla
Opis:
The use of CaO-based adsorbents has a high potential to capture CO2 from various systems due to its high reactivity with CO2, high capacity, and low cost of naturally derived CaO. The application of CaO-based sorbents to remove carbon dioxide is based on a reversible reaction between CaO and CO2. However, multiple carbonation/calcination cycles lead to a rapid reduction in the sorption capacity of natural CaO, and therefore efforts are made to reduce this disadvantage by doping, regenerating, or producing synthetic CaO with stable sorption properties. In this review, the synthesis methods used to obtain CaO-based sorbents were collected, and the latest research on improving their sorption properties was presented. The most commonly used models to describe the CO2 sorption kinetics on CaO-based sorbents were also introduced. The methods of sorbent regeneration and their effectiveness were summarized. In the last part of this review, the current state of advancement of work on the larger scale, possible problems, and opportunities during scale-up of the calcium looping process were presented. Concluding (i) the presented methods of adsorbent synthesis allow for the production of doped CaO adsorbents on a laboratory scale, characterized by high CO2 capture efficiency and good cyclic stability, (ii) the most commonly used in practice models describing CO2 chemisorption are empirical models and the shrinking core model, (iii) the use of sorbent regeneration allows for a significant improvement in sorption capacity, (iv) the scale-up of both the production of new CaO adsorbents and the CO2 capture technology with their use requires further development.
Źródło:
Chemical and Process Engineering; 2021, 42, 4; 411--438
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CO2 zamiast CO : katalityczna konwersja CO2 w syntezie związków karbonylowych
CO2 instead of CO : catalytic conversion of CO2 in the synthesis of carbonyl compounds
Autorzy:
Wójcik, Ewelina
Trzeciak, Anna M.
Powiązania:
https://bibliotekanauki.pl/articles/1410899.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
ditlenek węgla
karbonylacja
kataliza
redukcja
silany
carbon dioxide
carbonylation
catalysis
reduction
silanes
Opis:
Modem industrial carbonylation processes, leading to functionalized carbonyl compounds, are based on the application of highly toxic and flammable carbon monoxide. Recently, carbon dioxide which is non-toxic and abundant, has attracted attention as a perfect C1 source to build new C-C and C-N bonds. From the standpoint of green and sustainable chemistry, it is appealing and challenging to combine the reduction of CO2 with subsequent carbonylation using in situ formed CO. Herein we present the application of CO2 as C1 building block for the carbonylation of different organic compounds in the presence of transition metal catalysts (e.g. Pd, Rh, Ru, Fe). Industrially important organic compounds has been obtained in hydroformylation, dehydrogenation, hydrogenation, aminocarbonylation and carboxylation reactions with CO2. On the other hand, rapid reduction of CO2 to CO could processed in the metal catalyst - free systems, using a catalytic amount of fluoride salt and stoichiometric amount of di- or hydrosilane. In these reactions silyl formate has been identified as an important intermediate formed from silane and carbon dioxide. Also hydrazine and sodium borohydrate have been used for CO2 reduction to formic acid or other products. Obviously, these reactions could be restricted because of their sensitivity to the applied conditions, high cost of reactants as well as the waste generated. The presented examples of catalytic carbonylation reactions with CO2 as a source of CO group illustrate a high technological potential of this strategy.
Źródło:
Wiadomości Chemiczne; 2021, 75, 3-4; 395-422
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cost-efficient synthesis of multiprocessor heterogeneous systems
Autorzy:
Deniziak, S.
Powiązania:
https://bibliotekanauki.pl/articles/970364.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
rozproszony system komputerowy
HW/SW co-synthesis
distributed systems
SoC
Opis:
In this paper an algorithm for co-synthesis of distributed embedded systems is presented. The algorithm is based on iterative improvement heuristics, taking into consideration sophisticated modifications and possibilities of further improvements. Starting from the solution with the highest performance, architecture of the system is modified until it achieves the lowest cost. It has been observed that the algorithm presented has the capacity of getting out of the local minima. Experimental results showed high efficiency of the algorithm. Almost all results obtained with the help of the algorithm were significantly better than the results obtained with the help of Yen-Wolf algorithm presented in the literature.
Źródło:
Control and Cybernetics; 2004, 33, 2; 341-355
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Crosslinked poly(hydroxybutyl acrylate-co-acrylamide) based hydrogels : synthesis, characterization, and performance evaluation in heavy metal removal
Hydrożele na bazie usieciowanego poli(akrylanu hydroksybutylo-co-akrylamidu) : synteza, charakterystyka i ocena zdolności do usuwania metali ciężkich
Autorzy:
Abdallah, Zahraa Saadi
Mohammed, Ameen Hadi
Powiązania:
https://bibliotekanauki.pl/articles/24202779.pdf
Data publikacji:
2023
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
superabsorbent polymer
hydroxybutyl acrylate
acrylamide
adsorption properties
heavy metal ions removal
polimery superchłonne
akrylan hydroksybutylu
akryloamid
właściwości adsorpcyjne
usuwanie jonów metali ciężkich
Opis:
By radical polymerization, two series of superabsorbent hydrogels of hydroxybutyl acrylate and acrylamide copolymers, poly(HBA-co-AAm), were obtained. In the first series, the ratio of hydroxybutyl acrylate to acrylamide was optimized with a constant amount of methylene bisacrylamide (MBA) as a cross-linking agent. In the second series, the amount of MBA was changed at a fixed monomer ratio. The structure of the copolymers was confirmed by the FTIR method. Swelling parameters and mechanical properties were tested. Hydrogels with a high Young’s modulus and a high degree of swelling were selected for the study of adsorption properties towards Co2+, Ni2+ and Cd2+ ions. The influence of basic factors such as adsorbent dose, exposure time and pH on adsorption efficiency was also investigated. The ability to adsorb heavy metal ions changed as follows: Co2+> Ni2+> Cd2+.
Metodą polimeryzacji rodnikowej otrzymano dwie serie superchłonnych hydrożeli kopolimerów akrylanu hydroksybutylu i akryloamidu, poli(HBA-co-AAm), otrzymano. W pierwszej serii optymalizowano stosunek akrylanu hydroksybutylu do akryloamidu przy stałej ilości metylenobisakryloamidu (MBA) jako czynnika sieciującego. W drugiej serii przy ustalonym stosunku monomerów zmieniano ilość MBA. Strukturę kopolimerów potwierdzono metodą FTIR. Zbadano parametry pęcznienia oraz właściwości mechaniczne. Do badań właściwości adsorpcyjnych w stosunku do jonów Co2+, Ni2+ i Cd2+ wytypowano hydrożele o wysokim module Younga i wysokim stopniu pęcznienia. Zbadano również wpływ podstawowych czynników, takich jak dawka adsorbentu, czas ekspozycji i pH na efektywność adsorpcji. Zdolność do adsorpcji jonów metali ciężkich zmieniała się następująco: Co2+> Ni2+> Cd2+.
Źródło:
Polimery; 2023, 68, 2; 86--92
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cu(II), Co(II), Ni(II), Mn(II) and Zn(II) Schiff base complexes of 3-hydroxy-4-[N-(2-hydroxynaphthylidene)-amino]-naphthalene-1-sulfonic acid: Synthesis, Spectroscopic, thermal, and antimicrobial studies
Autorzy:
Bakare, Safyah B.
Powiązania:
https://bibliotekanauki.pl/articles/778830.pdf
Data publikacji:
2019
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Schiff base
hydroxynaphthalene-1-sulfonic acid
hydroxy-1-naphthaldehyde
transition metal ions
morphology
antimicrobial activity
Opis:
Five divalent transition metals Cu(II), Co(II), Ni(II), Mn(II) and Zn(II) complexes have been synthesized using 3-hydroxy-4-[N-(2-hydroxynaphthylidene)-amino]-naphthalene-1-sulfonic acid (H3L) Schiff base as a ligand derived from the condensation reaction between 4-amino-3-hydroxynaphthalene-1-sulfonic acid and 2-hydroxy-1-naphthalde-hyde. The synthesized complexes were characterized using microanalytical, conductivity, FTIR, electronic, magnetic, ESR, thermal, and SEM studies. The microanalytical values revealed that the metal-to-ligand stoichiometry is 1:1 with molecular formula [M2+(NaL)(H2O)x].nH2O (where x = 3 for all metal ions except of Zn(II) equal x = 1; n = 4, 10, 7, 4, and 6 for Cu(II), Co(II), Ni(II), Mn(II) and Zn(II), respectively). The molar conductivity result indicates that all these complexes are neutral in nature with non-electrolytic behavior. Dependently on the magnetic, electronic, and ESR spectral data, octahedral geometry is proposed for all the complexes except to zinc(II) complex is tetrahedral. Thermal assignments of the synthesized complexes indicates the coordinated and lattice water molecules are present in the complexes. SEM micrographs of the synthesized complexes have a different surface morphologies. The antimicrobial activity data show that metal complexes are more potent than the parent ligand.
Źródło:
Polish Journal of Chemical Technology; 2019, 21, 3; 26-34
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dehydrogenation of propane with CO2 - a new green process for propene and synthesis gas production
Autorzy:
Michorczyk, P.
Zeńczak, K.
Niekurzak, R.
Ogonowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/778939.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
dehydrogenation with CO2
propene
synthesis gas
integrated processes
Opis:
Dehydrogenation of propane in the presence of CO2 was considered as an alternative to commercial dehydrogenation pathway of obtaining propene and the new sources of synthesis gas. Based on thermodynamic calculations and a catalytic tests it was shown that by controlling CO2 concentration in the feed the molar ratio of H2/CO (synthesis gas) in the products mixture can be regulated. Several different pathways of DHP-CO2 process integration with commercialized chemical processes utilized synthesis gas were proposed.
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 4; 77-82
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Di-stimuli Responsive poly(N-Isopropylacrylamide-co-Diethylaminoethylmethacrylate) Copolymer: Synthesis, Characterization and Investigation of Aqueous Dispersion Properties
Autorzy:
Ashaduzzaman, Md.
Islam Shahidul, Md.
Powiązania:
https://bibliotekanauki.pl/articles/411593.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
di-stimuli responsive
copolymer
NIPAAm
DEAEMA
nano-particle
Opis:
We report on the synthesis, characterization and aqueous dispersion properties of well-defined double hydrophilic copolymer with pH- and thermo-responsive segments via atom transfer radical polymerization (ATRP). Poly(N-isopropylacrylamide-co-Diethylaminoethylmeth-acrylate), P(NIPAAm-co-DEAEMA), was prepared by ATRP using methyl-4-bromomethyl benzoate initiator. The product was characterized by proton-nuclear magnetic resonance (1H NMR) and attenuated total reflectance infrared (ATR-IR) spectroscopy. The multi-responsive switching between unimer and two types of micellar aggregates were characterized by temperature-dependent dynamic light scattering (DLS). Self-assembles into two types spherical aggregates in 1 mg/mL (0.0315 mM) aqueous solution, depending on solution pH and temperatures were widely investigated. The result shows two types of aggregate with large (280 nm) aggregate and variable sizes of small (17 nm, 25 nm, 45 nm) aggregates depending on temperature ranges from 26 to 40 °C at pH 4.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 20, 2; 136-144
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Direct synthesis of dimethyl carbonate and propylene glycol using potassium bicarbonate as catalyst in supercritical CO2
Autorzy:
Wen, Y.
Zhang, R.
Cang, Y.
Zhang, J.
Liu, L.
Guo, X.
Fan, B.
Powiązania:
https://bibliotekanauki.pl/articles/778066.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
direct synthesis
dimethyl carbonate
carbon dioxide
potassium bicarbonate
supercritical fluids
Opis:
The improved one-pot synthesis of dimethyl carbonate and propylene glycol from propylene oxide, supercritical carbon dioxide, and methanol with potassium bicarbonate as the catalyst has been reported in this paper. As far as we know, it is the first time to use potassium bicarbonate only as the catalyst in the production process which is simple and cheap. Satisfactory conversion rate of propylene oxide and yield of the products could be achieved at the optimized conditions with quite a small amount of by-products. Our new method offers an attractive choice for the production of dimethyl carbonate in large-scale industry efficiently and environmental friendly.
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 1; 62-65
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluidalne zgazowanie węgla przy użyciu CO2 dla produkcji gazu syntezowego
Fluidised bed gasification of coal with CO2 for the production of synthesis gas
Autorzy:
Chmielniak, T.
Popowicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1215955.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
Tematy:
węgiel
zgazowanie
ditlenek węgla
coal
gasification
carbon dioxide
Opis:
W pracy przedstawiono założenia technologii zgazowania węgla w atmosferze CO2 w reaktorze CFB oraz produkcji gazu syntezowego dla zastosowań chemicznych lub energetycznych. Omówiono istotę wykorzystania CO2 jako czynnika zgazowującego w procesie zgazowania. Przedstawiono wyniki obliczeń symulacyjnych procesu zgazowania ciśnieniowego węgla ZG „Janina” w atmosferze CO2 w reaktorze z cyrkulacyjnym złożem fluidalnym, tj. jednostkowe zużycia surowców, wydajności produktów i skład gazu surowego. Omówiono warianty technologiczne konfiguracji instalacji produkcji gazu syntezowego dla zastosowań chemicznych lub/i energetycznych.
This paper presents the assumptions about coal gasification process in the CO2 atmosphere in a CFB reactor and about the production of syngas for chemicals or energy production. The point of using CO2 as a gasifying agent in the gasification process was discussed. The results of simulation analysis of the gasification process of coal from ZG “Janina” [Coal plant “Janina”] under pressure in the CO2 atmosphere in a circulating fluidised bed gasification reactor, that is, the unit consumption of raw materials, product yield and composition of raw gas are presented. This paper also discusses the technological variants of the installation configuration for syngas production for chemicals and/or energy production.
Źródło:
Chemik; 2013, 67, 5; 415-422
0009-2886
Pojawia się w:
Chemik
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gamma-C₂S Synthesis from Fly Ash of Fluidize-Bed Boiler for CO₂ Capture
Autorzy:
Na, S.
Kang, S.
Lee, S.
Song, M.
Powiązania:
https://bibliotekanauki.pl/articles/1401357.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
Opis:
This paper describes the CO₂ capture performance of cement blended paste incorporating gamma-dicalcium silicate (gamma-C₂S) made with industrial by-products, by taking into consideration of effect of CaCO₃, fly ash replacement ratio under the sintering process. X-ray diffraction method was conducted in order to quantitatively investigate the gamma-C₂S content. CO₂ capture performance of mortar sample incorporating gamma-C₂S was investigated by means of compressive strength test using accelerated carbonation chamber. The experimental results revealed that the kind of CaCO₃ would affect the affect the formation of gamma-C₂S after the sintering with respect to the XRD-Rietveld analysis. Moreover, it is confirmed that compressive strength of mortar sample incorporating gamma-C₂S has the same tendency at curing age of 3, 7 and 28days. Blended mortar sample made with 10 wt.% replacement ratio of gamma-C₂S had high compressive strength value compared to normal mortar sample, therefore, incorporating gamma-C₂S had a positive effect on the compressive strength after accelerated carbonation. Finally, the waste foundry sand powder may be alternative to produce gamma-C₂S.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1282-1285
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Green synthesis of thioxoimidazolidine derivative ligand: Spectroscopic, thermal and biological assignments of new Cu(II), Co(II), and Ni(II) chelates in neutral system
Autorzy:
Alosaimi, Abeer M.
Saad, Hosam A.
Refat, Moamen S.
Al-Hazmi, Ghaferah H.
Powiązania:
https://bibliotekanauki.pl/articles/1849315.pdf
Data publikacji:
2021
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Imidazolidine
Microwave irradiation
Coordination
Biological activity
Opis:
Eco-friendly synthesis of ethyl 3-(4-oxo-3-(1-(pyridin-3-yl)ethylideneamino)-2-thioxoimidazolidin-1-yl)propanoate (4) ligand (L) using microwave irradiation technique was described. The structure of thioxoimidazolidine derivative ligand compound has been established based on different types of analyses such as infrared, 1H-NMR, 13C-NMR, and mass spectra as well as elemental analysis. The copper, cobalt, and nickel(II) complexes with molecular for-mula [M(L)(H2O)4]Cl2 (where M = Co(II), Ni(II), and Cu(II), L = thioxoimidazolidine derivative ligand), have been prepared and well-characterized using microanalytical, conductivity measurements, magnetic, spectroscopic, and physical analyses. Upon the outcome results of analyses, the stoichiometry of the synthesized complexes is 1:1 (M:L). The molar conductance values concluded that the behavior of metal complexes was electrolytes. The 3-(4-oxo-3-(1-(pyridin-3-yl)ethylideneamino)-2-thioxoimidazolidin-1-yl)propanoate chelate acts as a monovalent bidentate fashion via nitrogen and oxygen atoms of both thioxoimidazolidine and propanoate ester moieties. The geometric structures of the synthesized metal complexes are an octahedral confi guration based on spectroscopic and magnetic moment studies. The thermogravimetric assignments deduced that the presence of four coordinated water molecules. The synthesized copper(II), cobalt(II), and nickel(II) complexes were biologically checked against G+ and G- bacteria and two species of fungi (Aspergillus Nigaer, and Penicillium Sp.).
Źródło:
Polish Journal of Chemical Technology; 2021, 23, 3; 1-9
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hyperfine Interactions and Some Magnetic Properties of Nanocrystalline $Co_{40}Fe_{50}Ni_{10}$ and $Co_{50}Fe_{45}Ni_{5}$ Alloys Prepared by Mechanical Synthesis and Subsequently Heat Treated
Autorzy:
Pikula, T.
Oleszak, D.
Pękała, M.
Powiązania:
https://bibliotekanauki.pl/articles/1506594.pdf
Data publikacji:
2011-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.20.Ev
75.50.Kj
61.10.-i
76.80.+y
75.60.Ej
Opis:
$Co_{40}Fe_{50}Ni_{10}$ and $Co_{50}Fe_{45}Ni_{5}$ ternary alloys were prepared by mechanical alloying method. To check the stability of their structure thermal treatment was applied subsequently. As X-ray diffraction studies proved the final products of milling were the solid solutions with bcc lattice and the average grain sizes ranged of tens of nanometers. After heating of the $Co_{50}Fe_{45}Ni_{5}$ alloy up to 993 K the mixture of two solid solutions with bcc and fcc lattices was formed. In other cases thermal treatment did not change the type of the crystalline lattice. Mössbauer spectroscopy revealed hyperfine magnetic field distributions which reflected the different possible atomic surroundings of $\text{}^{57}Fe$ isotopes. Results of the macroscopic magnetic measurements proved that both investigated alloys had relatively good soft magnetic properties.
Źródło:
Acta Physica Polonica A; 2011, 119, 1; 52-55
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of hard segments content on thermal, morphological and mechanical properties of homo and co-polyurethanes: a comparative study
Autorzy:
Alobad, Z.K.
Albozahid, M.
Naji, H.Z.
Alraheem, H.S.
Saiani, A.
Powiązania:
https://bibliotekanauki.pl/articles/2175782.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
homo-polyurethane
co-polyurethane
polyurethane synthesis
hard segments
morphological properties
mechanical properties
synteza poliuretanu
segmenty twarde
właściwości morfologiczne
właściwości mechaniczne
Opis:
Purpose: This work aims to study the effect of hard segments (HS) content on the thermal, morphological and mechanical properties of polyurethane polymers based on 1.5 pentanediol chain extenders. Design/methodology/approach: Two comparable series of polyurethanes were synthesised including homo-polyurethane (Homo-PU) and copolyurethane (Co-PU). The Homo-PU consists of 100% wt. of hard segments (HS). The Co-PU composes of 30%wt. of soft segments (SS) using a poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) material. The effect of hard segments content on the morphology of Homo-PU and Co-PU was also studied. Findings: The Homo-PU and Co-PU materials show three distinct degradation steps with the higher thermal stability of the Co-PU compared to the Homo-PU. Enthalpy of fusion (ΔHM) and heat capacity (ΔCP) of polyurethane (PU) samples decrease with decreasing HS content. In the cooling cycle, the higher exothermic peak of crystallization is observed in the Co-PU. In contrast, the cold crystalline peak is observed in the 2nd heating cycle of the Homo-PU. Melting temperature (TM) increases with increasing SS content. Glass transition temperature (Tg) of PU samples shifts to higher temperature with increasing HS content. Storage modulus (E’) of the Co-PU is higher than E’ of the Homo-PU. All N-H groups in PU samples are hydrogen-bonded, whilst most of the C=O groups are hydrogen-bonded. The degree of hydrogen bonding in PU samples decreases with decreasing HS content. The Homo-PU shows better hardness than the Co-PU and higher brittleness at low temperature. WAXS results of the Homo-PU display better crystallinity compared to the Co-PU. Research limitations/implications: The main challenge in this work was how to synthesis Thermoplastic polyurethanes (TPUs) with specific properties to compete other common polymer such as Polyamides (PA) and Polypropylene (PP). Practical implications: Thermoplastic polyurethanes (TPUs) can be used in various application such as backageing, foot,automobiles and constructions. Originality/value: A new type of TPUs that synthesized using different type of chain extender (1.5 pentanediol). Two different types of TPUs were synthesized one contained 30% SS and 70% HS and a second one contained 100% HS.
Źródło:
Archives of Materials Science and Engineering; 2021, 109, 1; 5--16
1897-2764
Pojawia się w:
Archives of Materials Science and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 49

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