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Tytuł:
FePt3 nanosuspension synthesized from different precursors – a morphological comparison by SAXS, DLS and TEM
Autorzy:
Sarmphim, P.
Soontaranon, S.
Sirisathitkul, C.
Harding, P.
Kijamnajsuk, S.
Chayasombat, B.
Pinitsoontorn, S.
Chingunpitak, J.
Powiązania:
https://bibliotekanauki.pl/articles/201918.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnetic nanosuspension
Fe(acac)3
Fe(hfac)3
DLS
TEM
SAXS
Fe (acac) 3
Fe (hfac) 3
Opis:
Annealed iron-platinum (FePt) is ferromagnetic in a nanoscale regime which is necessary for energy and data storage, whereas the as-synthesized form of FePt-based nanoparticles exhibits superparamagnetism useful for biomedical applications. In this study, as-synthesized nanosuspensions from the reaction of Pt(acac)2 with Fe(acac)3 and Fe(hfac)3 are compared. X-ray diffraction (XRD) peaks for both samples are assigned to the FePt3 phase. As shown by transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS), nanoparticles synthesized by using Fe(acac)3 have a smaller average diameter, but larger polydispersity index and particle agglomerations. On the other hand, the nanoparticles synthesized by using Fe(hfac)3 can self-assemble into a longer range of patterned monolayer. Dynamic light scattering (DLS), measuring the size of cluster of nanoparticles as well as oleic acid and oleylamine at their surface, confirms that larger agglomerations in the sample were synthesized by using Fe(acac)3. In addition to the size distribution, magnetic properties were influenced by the composition of these nanoparticles.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 1; 79-84
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of annealing time and temperature on the Fe3Al intermetallic alloys microstructure modification
Autorzy:
Garbala, K.
Patejuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/380040.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
intermetallic alloy
Fe3Al phase
microstructure modification
stop międzymetaliczny
faza Fe3Al
modyfikacja mikrostruktury
Opis:
There is an industry interesting in intermetallic alloys in recent years. There are widely possibilities to adopt this kind of materials for structural units. More expensive materials can be replaced by them. A property which limits their wider application is the low plasticity at environment and elevated temperatures. In paper the results of the thermal microstructure modification are shown. To this end, the influence of annealing time and temperature on the intermetallic phase Fe3Al grain size was investigated. The impact of these factors on micro-hardness was examined as well. It was found that these operations cause the grain size reduction and the micro-hardness decrease.
Źródło:
Archives of Foundry Engineering; 2011, 11, 2 spec.; 39-42
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ soli Fe3+ na fotokatalityczny rozkład substancji promieniochronnych w wodnej zawiesinie TiO2
Effect of Fe3+ salts on the photocatalytic decomposition of sunscreens in the aqueous suspension of TiO2
Autorzy:
Adamek, E.
Baran, W.
Sobczak, A.
Szczepka, N.
Powiązania:
https://bibliotekanauki.pl/articles/126575.pdf
Data publikacji:
2013
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
fotokataliza
sole Fe3+
TiO2 P25
substancje promieniochronne
photocatalysis
Fe3+ ions
photodegradation
sunscreens
Opis:
Przedmiotem badań były dwie substancje promieniochronne: benzofenon 4 (BP-4) i kwas fenylenobenzimidazolosulfonowy (PBSA). W pracy zbadano możliwość zwiększenia efektywności procesu fotokatalitycznego utleniania tych związków, prowadzonego w obecności TiO2 P25, po dodaniu soli Fe3+. Roztwory wodne zawierające próbki badanych substancji promieniochronnych naświetlano promieniowaniem UVA (λmax 366 nm) w obecności wyłącznie TiO2 P25 lub soli Fe3+ oraz w mieszaninie TiO2 P25 i soli Fe3+, w każdym przypadku przy pH~3. W próbkach pobieranych podczas naświetlania oznaczano metodą HPLC stężenie nierozłożonych substancji promieniochronnych. W pracy oceniano m.in. dynamikę zmian stężenia tych związków w trakcie procesu fotodegradacji oraz określono jego kinetykę. Stwierdzono, że w warunkach doświadczalnych obie substancje promieniochronne ulegały fotokatalitycznej degradacji, a jony Fe3+ miały wpływ na szybkość tego procesu. Efektywność ich fotodegradacji w mieszaninie TiO2 P25 i soli Fe3+ była większa w porównaniu z analogicznym procesem prowadzonym w obecności samego TiO2 P25. Stwierdzono też, że omawiany proces przebiegał zgodnie z kinetyką reakcji pseudopierwszego rzędu.
The subjects of this study were two sunscreens: 2-hydroxy-4-methoxy benzophenone-5-sulphonic acid (benzophenone 4, BP-4) and 2-phenylbenzimidazole-5-sulfonic acid (PBSA). In this paper the possibility of increasing the photocatalytic oxidation efficiency of these compounds after the addition of Fe3+ salts to TiO2 P25 suspension was studied. Aqueous solutions containing the investigated compounds were irradiated with UVA radiation (λmax 366 nm) in the presence of TiO2 P25 or Fe3 + salt only and in a mixture of TiO2 P25 with Fe3+ salt in all cases at pH ~ 3. In the samples taken during irradiation, the concentrations of undecomposed sunscreens were Wpływ soli Fe3+ na fotokatalityczny rozkład substancji promieniochronnych w wodnej zawiesinie TiO2 279 determined using RP-HPLC method. Additionally, the dynamics of the concentration changes during the photodegradation process and its kinetics were determined. It was found that under experimental conditions, both sunscreens underwent the photocatalytic degradation and Fe3+ ions influenced the rate of this process. Their photodegradation efficiency in the presence of TiO2 P25 with Fe3+ salt was higher than that obtained in the process carried out in the presence of TiO2 P25 alone. Moreover, the process was in accordance with the first-order kinetics.
Źródło:
Proceedings of ECOpole; 2013, 7, 1; 273-279
1898-617X
2084-4557
Pojawia się w:
Proceedings of ECOpole
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fabrication Fe/Fe3O4/Graphene Nanocomposite Electrode Material for Rechargeable Ni/Fe Batteries in Hybrid Electric Vehicles
Autorzy:
Kumar, H.
Shukla, A. K.
Powiązania:
https://bibliotekanauki.pl/articles/412042.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Graphene
Nanocomposite
rechargeable batteries
Fe3O4
Opis:
Fe/Fe3O4/Graphene composite electrode material was synthesized by a thermal reduction method and then used as anode material along with Nickel cathode in rechargeable Ni/Fe alkaline batteries in hybrid electric vehicles. Reduced graphene /Fe/Fe3O4 composite electrode material was prepared using a facile three step synthesis involving synthesis of iron oxalate and subsequent reduction of exfoliated graphene oxide and iron oxalate by thermal decomposition method. The synthesis approach presents a promising route for a large-scale production of reduced graphene /Fe/Fe3O4 composite as electrode material for Ni/Fe rechargeable batteries. The particle size and structure of the samples were characterized by SEM and XRD.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 14; 15-25
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel N,N’-bis(2,4-dimethoxybenzylidene)ethylenediamine PVC membrane electrode for the potentiometric iron selective sensor based on Schiff base ligand
Nowa elektroda membranowa z PVC i N,N’-bis(2,4-dimetoksybenzylideno)-etylenodiaminy jako potencjometryczny jonoselektywny czujnik żelaza oparty na ligandzie zasady Schiffa
Autorzy:
Kumar, Sachin
Sandhu, Susheel K.
Patel, Agnik K.
Parmar, Ketankumar H.
Powiązania:
https://bibliotekanauki.pl/articles/2120225.pdf
Data publikacji:
2022
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
Tematy:
Fe3+ ions
ion-selective electrode
PVC membrane
potentiometry
Schiff base
jony Fe3+
elektrody jonoselektywne
membrana PVC
potencjometria
zasada Schiffa
Opis:
N,N’-bis(2,4-dimethoxybenzylidene)ethylenediamine was synthesized and used as a membrane carrier to create a novel poly(vinyl chloride) membrane potentiometric sensor that is selective especially for Fe3+ ions. The super-Nernstian slope of the projected sensor was 19.5 mV per decade over a concentration range of 7.3•10-8–1•10-1 M having detection limit at 7.3•10-8 M. The sensor displayed a linear potential response for the detection of Fe3+ ions in about 30 seconds, and it had a lifespan of no less than 9 weeks without lacking any potential divergence. The selected sensor showed high selectivity in water solutions in relation to Fe3+ ions, even in the presence of other metal cations in the pH range of 3.6–10.
Przedmiotem badań był potencjometryczny czujnik do selektywnego oznaczania jonów Fe3+ oparty na membranie wykonanej z poli(chlorku winylu) i N,N’-bis(2,4-dimetoksybenzylideno)etylenodiaminy. Nachylenie super-nernstowskie (ang. super-Nernstian slop) badanego czujnika wynosiło 9,5 mV na dekadę w zakresie stężeń 7,3•10-8–1•10-1 M z limitem detekcji 7.3•10-8 M. Czujnik wykazywał w obecności jonów Fe3+ liniową odpowiedź przez około 30 s, a jego czas życia bez rozbieżności potencjałów wynosił nie mniej niż 9 tygodni. Wybrany czujnik wykazywał w roztworach wodnych wysoką selektywność w stosunku do jonów Fe3+ nawet w obecności innych kationów metali w zakresie pH 3,6–10.
Źródło:
Polimery; 2022, 67, 5; 197--204
0032-2725
Pojawia się w:
Polimery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and antibacterial properties of Fe3O4-Ag nanostructures
Autorzy:
Pachla, A.
Lendzion-Bieluń, Z.
Moszyński, D.
Markowska-Szczupak, A.
Narkiewicz, U.
Wróbel, R. J.
Guskos, N.
Żołnierkiewicz, G.
Powiązania:
https://bibliotekanauki.pl/articles/778603.pdf
Data publikacji:
2016
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
Fe3O4 nanoparticles
superparamagnetic nanoparticles
silver nanoparticles
Opis:
Superparamagnetic iron oxide nanoparticles were obtained in the polyethylene glycol environment. An effect of precipitation and drying temperatures on the size of the prepared nanoparticles was observed. Superparamagnetic iron oxide Fe3O4 , around of 15 nm, was obtained at a precipitation temperature of 80°C and a drying temperature of 60°C. The presence of functional groups characteristic for a polyethylene glycol surfactant on the surface of nanoparticles was confirmed by FTIR and XPS measurements. Silver nanoparticles were introduced by the impregnation. Fe3O4-Ag nanostructure with bactericidal properties against Escherichia coli species was produced. Interesting magnetic properties of these materials may be helpful to separate the bactericidal agent from the solution.
Źródło:
Polish Journal of Chemical Technology; 2016, 18, 4; 110-116
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Properties of 17Cr-0.8C Cast Steel
Autorzy:
Kalandyk, B.
Zapała, R.
Pałka, P.
Wróbel, M.
Powiązania:
https://bibliotekanauki.pl/articles/353847.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
martensitic cast steel
M23C6
Fe7C3
Fe3C carbides
heat treatment
microstructure
hardness
Opis:
The results of studies of the microstructure and properties of cast high alloy steels containing 17% Cr and 0.8% C subjected to different variants of heat treatment are presented. For phase identification, the light microscopy and scanning electron microscopy as well as the X-ray diffraction analysis were used. The conducted studies revealed the presence of carbides in the microstructure, mainly of the M23C6 carbide, detected after both quenching and tempering at 200 and 600°C. The use of low and high tempering significantly reduced the test alloy hardness from 657.3 HV30 to 403.7 HV30. At the same time, hardness was observed to have an impact on the values of abrasion in the conducted Miller slurry test. Higher material hardness leads to lower wear expressed by mass loss.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 113-117
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Magnetite Oxide Nanoparticles and Tungsten Oxide Nanoparticles on Phosphate Removal from Aqueous Solutions
Autorzy:
EL-Baz, Amro
Mokhtar, Mona
Abdo, Ahmed
Powiązania:
https://bibliotekanauki.pl/articles/24201790.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
phosphate removal
nanoparticles
Fe3O4 NPs
WO3 NPs
adsorption
desorption
Opis:
Phosphate (P) removal from aqueous solutions were studied by a new mineral adsorbent, tungsten (VI) oxide (WO3) nanoparticles (NPs), which has not been the subject of much research in the field of removing P contaminants from agricultural wastewater. In this paper, P was removed from aqueous solutions by a new mineral adsorbent, WO3 NPs and it was compared with magnetite (iron IV) oxide (Fe3O4) nanoparticles (NPs) under the same ambient operating conditions i.e., The influence of the dosage of adsorbents, initial P concentration, contact time, pH and temperature. The values that achieved the best removal were recorded. It was concluded that the best limits for pH were at 2–3, contact time at 40 minutes, temperature at 45 °C and adsorbent dose at 1.0 g/L. Best results of the variables were applied on samples of real agricultural wastewater, which achieved removal ratio of 77.3% and 75.42% for Fe3O4 and WO3 NPs, respectively. SEM, EDX and FTIR images and analyses were conducted to describe the characteristics of nano-adsorbents used before and after P adsorption in aqueous solutions. The P adsorption kinetics for aqueous solutions were examined by fitting results of the experiment to both the first & second pseudo-kinetically models. The outcome indicated that kinematic data fit better with pseudo-second-order kinetic models. Moreover, the information captured from equilibrium adsorption was analyzed using isothermal methods (by Langmuir & Freundlich Forms). Their results showed that the Freundlich form is considered more suitable than Langmuir form in analyzing the biosorption of P ions. The thermodynamic demeanor of P adsorption by Fe3O4 and WO3 NPs was analyzed and evaluated, and the thermodynamic data analyses confirmed the process of P adsorption was spontaneous. The ΔG° value was negative, while ΔH° and ΔS° values found to be positive, which means that the adsorption of P was a spontaneous, random and endothermic operation. In general, Fe3O4 and WO3 nanoparticles had a high efficiency in removing phosphate from water. In addition, WO3 NPs has been identified as one of the most promising adsorbents due to its rapid and effective adsorption of pollutants.
Źródło:
Journal of Ecological Engineering; 2023, 24, 3; 287--303
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation Between Structure, Microstructure and Dielectric Properties of Bi7Fe3Ti3O21 Ceramics Obtained in Different Conditions
Autorzy:
Szalbot, D.
Bartkowska, J. A.
Feliksik, K.
Bara, M.
Chrunik, M.
Adamczyk-Habrajska, M.
Powiązania:
https://bibliotekanauki.pl/articles/356042.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multiferroic materials
Aurivillius phases
Bi7Fe3Ti3O21
dielectric properties
Opis:
Multiferroic six-layer Aurivillius type Bi7Fe3Ti3O21 ceramics was obtained by conventional mixed oxides method. The final sintering process was taken in several different sintering times, which determined changes in properties of discussed ceramic material. The structure and dielectric properties of the material are reported. In order to examine the technological conditions on the crystal structure, XRD analysis was carried out. The microstructure, as well as the quantitative and qualitative analysis of the chemical composition were investigated by scanning electron microscope with an energy dispersion spectrometer. The main purpose of the paper is to present the effect of sintering time on the microstructure, crystallographic structure and dielectric properties of Bi7Fe3Ti3O21 ceramics.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 879-884
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Halloysite composites with Fe3O4 particles: the effect of impregnation on the removal of aqueous Cd(II) and Pb(II)
Autorzy:
Maziarz, Paulina
Matusik, Jakub
Powiązania:
https://bibliotekanauki.pl/articles/127631.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
Fe3O4 particles
halloysite
adsorption
Cd(II)
Pb(II)
Opis:
In this study, halloysite-Fe3O4 composites were synthesized by a chemical-precipitation method to facilitate magnetic separation of the sorbents from aqueous solution. The research focused on the effect of Fe3O4 phase on the halloysite sorption properties. The X-ray diffraction (XRD) results confirmed successful deposition of Fe3O4 particles on a halloysite surface. They showed that the coating with Fe3O4 particles enhanced the halloysite adsorption affinity toward Cd(II) and Pb(II). The highest adsorption capacity was determined for the composites having 10% of the surface deposited with Fe3O4. In this case, the adsorption capacity for Cd(II) and Pb(II) was 33 and 112 mmol•kg-1, respectively. The point of zero charge (pHPZC) and desorption results indicated that the removal mechanism of metals is mainly related to chemisorption involving reaction with hydroxyls of either halloysite or Fe3O4 phase. The ion exchange is of limited importance due to the low cation exchange capacity (CEC) of halloysite - Fe3O4 composites.
Źródło:
Mineralogia; 2017, 48, 1/4; 107-126
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Strain Rate on the Microstructure of Warm-Deformed Ultrafined Medium-Carbon Steel
Autorzy:
Yuan, Q.
Xu, G.
Liu, S.
Liu, M.
Hu, H.
Powiązania:
https://bibliotekanauki.pl/articles/355659.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
warm deformation
medium-carbon steel
ultrafine grain
strain rate
Fe3C
Opis:
In this study, medium-carbon steel was subjected to warm deformation experiments on a Gleeble 3500 thermosimulator machine at temperatures of 550°C and 650°C and strain rates of 0.001 s-1 to 1 s-1. The warm deformation behavior of martensite and the effects of strain rate on the microstructure of ultrafine grained medium-carbon steel were investigated. The precipitation behavior of Fe3C during deformation was analyzed and the results showed that recrystallization occurred at a low strain rate. The average ultrafine ferrite grains of 500 ± 58 nm were fabricated at 550°C and a strain rate of 0.001 s-1. In addition, the size of Fe3C particles in the ferrite grains did not show any apparent change, while that of the Fe3C particles at the grain boundaries was mainly affected by the deformation temperature. The size of Fe3C particles increased with the increasing deformation temperature, while the strain rate had no significant effect on Fe3C particles. Moreover, the grain size of recrystallized ferrite decreased with an increase in the strain rate. The effects of the strain rate on the grain size of recrystallized ferrite depended on the deformation temperature and the strain rate had a prominent effect on the grain size at 550°C deformation temperature. Finally, the deformation resistance apparently decreased at 550°C and strain rate of 1 s-1 due to the maximum adiabatic heating in the material.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 4; 1805-1813
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ modyfikacji zeolitów na ich właściwości fizykochemiczne
Impact of zeolites modification on their physicochemical properties
Autorzy:
Świderska-Dąbrowska, R.
Schmidt, R.
Powiązania:
https://bibliotekanauki.pl/articles/1819297.pdf
Data publikacji:
2012
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
ion exchange
natural clinoptilolite
removal
cations
metals
Cr3+
cu2+
pb2+
Fe3+
Opis:
Zeolites are crystalline, hydrated aluminosilicates of alkali and alkaline earth metals (Na, K, Mg, Ca, Sr, Ba), in which the pore size is 0.3-1.2 nm and depends on the structure of the zeolite. They consist of tetrahedrons of [AlO4]-5- and [SiO4]4-, which make ordered crystal lattice of rings, channels and chambers. Variable degree of oxidation of silicon (IV) and aluminum (III) causes their electronegative character. The size of the charge may determine the adsorption, ion exchange and catalytic capacities of zeolite. The structure made of ring tetrahedron units contains open tunnels, making zeolites also molecular sieves. Zeolites are mostly used for adsorption of ammonium ions from aqueous solutions, removal of radioactive elements and heavy metals, and recent studies suggest the possibility of application of zeolites for removal of chloroorganic compounds and oily pollutants. The most widely used zeolite in practice for water and wastewater treatment is clinoptilolite, which is characterized by large ion exchange and adsorption capacity. Authors of many works explain the adsorption process with ion exchange. But when interpreting the results the authors do not consider that the zeolites have also tunnels that make them also molecular sieves. As a result of ion adsorption on clinoptilolite in hydrogen or sodium form, pH of the solution decreases, resulting in possible formation of electropositive, electronegative complexes and dissociated ions which make up aquaions, increasing or decreasing the effectiveness of their removal. During usage of modified zeolites for the adsorption of ions from aqueous solutions, many accompanying processes take place, such as precipitation, coprecipitation and catalytic adsorption. The influence of the physicochemical properties of natural zeolite and zeolite in the hydrogen form on an aqueous solution in the process of washing out is presented in the paper. Presented results clear prove that the decisive factor affecting the quality of the aqueous solution after the washing out process is initial pH of the solution. Depending on method of modification, physicochemical properties of zeolites can vary considerably. Transformation of natural zeolite into the hydrogen form increases its acidity and physical and chemical resistance. Modification of zeolite with HCl may also increase the content of pure zeolite by dissolution of other, non-zeolite materials. Zeolite H has a greater content of of silicon and aluminum compounds in relation to total mass which is a result of introduction of protons into the zeolite. This is confirmed by lower content of alkali metals and alkaline earth metals (sodium, calcium and potassium) in ZH. Exchange of ions of sodium, potassium, calcium for protons is a result of modification of ZN with HCl. Examination of washing out process showed that there is a small migration of impurities (Fe and Ca) from ZH as compared to ZN. At the same time increase of iron content in the solution increases its turbidity. And also turbidity depends on the initial pH of the solution. It's highest value was observed when the initial pH was equal to 6. Significant increase of turbidity as a function of pH is mainly caused by abrasion of zeolite grains in the process of shaking and by formation of precipitable complexes of iron and calcium. The paper presents also the results of zeta potential measurements. potential of H zeolite in the investigated range of pH has a much higher absolute values compared to ZN and vary in the range from -20 mV to -30 mV. H zeolite has a higher electrostatic activity than natural zeolite. Potential creating ions such as H+ and OH- have decisive influence on the zeolite surface charge.
Źródło:
Rocznik Ochrona Środowiska; 2012, Tom 14; 460-470
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the structure and abrasive wear resistance of white cast iron with precipitates of carbides
Analiza struktury oraz odporność na zużycie ścierne żeliwa białego z wydzieleniami węglików
Autorzy:
Kopyciński, D.
Kawalec, M.
Szczęsny, A.
Gilewski, R.
Piasny, S.
Powiązania:
https://bibliotekanauki.pl/articles/351529.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
abrasive wear resistance
white cast iron
intermetallic phase
type of carbides: (Fe,Cr)3C
(Fe,Cr)7C3
VC
TiC
odporność na ścieranie
żeliwo białe
fazy międzymetaliczne
węgliki typu (Fe, Cr)3C (Fe, Cr)7C3
Opis:
The resistance of castings to abrasive wear depends on the cast iron abrasive hardness ratio. It has been anticipated that the white cast iron structure will be changed by changing the type of metal matrix and the type of carbides present in this matrix, which will greatly expand the application area of castings under the harsh operating conditions of abrasive wear. Detailed metallographic analysis was carried out to see the structure obtained in selected types of white cast iron, i.e. with additions of chromium and vanadium. The study compares the results of abrasive wear resistance tests performed on the examined types of cast iron.
Odporność żeliwa na zużycie ścierne zależy od stosunku twardości metalu i ścierniwa. W pracy założono kształtowanie struktury żeliwa białego w wyniku zmiany rodzaju osnowy metalowej oraz węglików, co znacznie rozszerza obszar zastosowania odlewu w trudnych warunkach zużycia ściernego. Przeprowadzono szczegółowa analizę metalograficzną struktury wybranych gatunków żeliwa białego t.j.: chromowego oraz wanadowego. W niektórych przypadkach zaproponowano koncepcje sterowania ilością i rodzajem węglików w osnowie metalowej żeliwa lub wprowadzania dodatkowych węglików do struktury eutektycznej tego rodzaju żeliwa. Ponadto w pracy porównano wyniki badań odporności na zużycie ścierne analizowanych gatunków żeliwa.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 3; 973-976
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of Hexabenzylhexaazaisowurtzitane (HBIW) under Ultrasound Irradiation with Fe3O4@PCA Nanoparticles as an Efficient and Reusable Nanomagnetic Catalyst
Autorzy:
Malekzadeh, A. M.
Shokrollahi, S.
Ramazani, A.
Rezaei, S. J. T.
Asiabi, P. A.
Joo, S. W.
Powiązania:
https://bibliotekanauki.pl/articles/358107.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
hexabenzylhexaazaisowurtzitane (HBIW)
nanomagnetic catalyst
solid acid
Fe3O4@PCA
ultrasound irradiation
Opis:
Magnetic Fe3O4@polycitric acid (Fe3O4@PCA) nanoparticles were prepared by the reaction of Fe3O4 nanoparticles with an excess amount of citric acid at 100-160 °C. The magnetic Fe3O4@PCA nanoparticles were characterized by infrared spectroscopy (FTIR), scanning electron microscope (SEM), Transmission Electron Microscopy (TEM), Thermogravimetric Analysis (TGA) and powder X-ray diffraction (XRD). Finally, the synthesized magnetic Fe3O4@PCA nanoparticles were used as a heterogeneous solid acid catalyst for the synthesis of HBIW from benzylamine and glyoxal in acetonitrile-water solvent under ultrasonic irradiation conditions. The catalyst could be reused up to 6 times without significant loss of activity.
Źródło:
Central European Journal of Energetic Materials; 2017, 14, 2; 336-350
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cytotoxicity and genotoxicity of GO-Fe3O4 hybrid in cultured mammalian cells
Autorzy:
Jedrzejczak-Silicka, M.
Powiązania:
https://bibliotekanauki.pl/articles/779480.pdf
Data publikacji:
2017
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
GO-Fe3O4 hybrid
relative viability
DNA fragmentation
micronucleus assay
genotoxicity
Opis:
The study was aimed at investigating the effect of the Fe3O4  hybrid deposited on graphene oxide (GO- Fe3O4) on the relative viability and DNA integrity. The properties of the GO-Fe3O4  hybrid were analyzed using a transmission electron microscopy (TEM), X-ray diffraction technique (XRD) and thermal gravimetric method (TGA), while the efficiency of graphene oxide covalent functionalization with iron oxide nanospheres was determined by Fourier transform infrared spectroscopy (FT-IR). L929 and MCF-7 cell lines were selected to analyze the biocompatibility of GO-Fe3O4  nanoparticles. The hybrid was tested using WST-1 and LDH leakage assays. DNA integrity was analyzed by agarose gel electrophoresis and micronucleus assay was performed to examine chromosomal damage in the exposed cell lines. The tested GO-Fe3O4  hybrid did not significantly reduce cell metabolism of L929 cells. GO-Fe3O4 hybrid particles only slightly affected the integrity of cell membranes. DNA integrity and micronucleus assays did not indicate genotoxicity of the hybrid.
Źródło:
Polish Journal of Chemical Technology; 2017, 19, 1; 27-33
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 45

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