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Wyszukujesz frazę "coprecipitation" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Pseudocapacitive Characteristics of Mg Doped ZnO Nanospheres Prepared by Coprecipitation
    Autorzy:
    Arul, S.
    Senthilnathan, T.
    Jeevanantham, V.
    Satheesh Kumar, K. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049144.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zinc oxide
    Mg-doped ZnO
    coprecipitation
    cyclic voltammetry
    EiS
    Opis:
    A n-type semiconductor ZnO has high transmittance features, excellent chemical stability and electrical properties. It is also commonly used in a range of fields, such as gas sensors, photocatalysts, optoelectronics, and solar photocell. Magnesium-doped zinc oxide (Mg-ZnO) nano powders were effectively produced using a basic chemical precipitation process at 45°C. Calcined Mg-ZnO nano powders have been characterized by FTIR, XrD, SEM-EDX and Pl studies. XRD measurements from Mg-ZnO revealed development of a crystalline structure with an average particle size of 85 nm and SEM analysis confirmed the spherical morphology. Electrochemical property of produced Mg-ZnO nanoparticles was analyzed and the specific capacitance value of 729 F g-1 at 0.5 A g-1 current density was recorded and retained a specific capacitance ~100 percent at 2 A g-1 current density.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1141-1148
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of Nanocrystalline BaCeO₃ by Oxalate Coprecipitation for YBa₂Cu₃O₇ Bulk Superconductors
    Autorzy:
    Verbová, R.
    Kavečanský, V.
    Diko, P.
    Antal, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030594.pdf
    Data publikacji:
    2018-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Opis:
    Barium cerate (BaCeO₃) is one of the preferred additions to bulk YBa₂Cu₃O₇ single-grain superconductors to inhibit the growth of Y₂BaCuO₅ particles. The present paper investigates synthesis of very fine barium cerate powder and its use in YBa₂Cu₃O₇ bulk superconductor growth. The crystalline barium cerate was synthesized by oxalate co-precipitation from barium and cerium nitrates. X-ray diffraction in air and vacuum was performed to understand the formation of barium cerate as well as to determinate its crystal structure. Size and shape of BaCeO₃ particles were studied by scanning electron microscopy. The BaCeO₃ was used to grow YBa₂Cu₃O₇ bulk superconductor. Microstructure of prepared YBa₂Cu₃O₇ crystal shows that the barium cerate in the final product is very fine and uniformly distributed throughout the whole YBa₂Cu₃O₇ crystal.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 1; 82-85
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure, morphology, and band gap of Ti-V-O mixed oxides processed by coprecipitation and calcination
    Autorzy:
    Park, M.
    Lim, Y.
    Sung, Y.
    Kwak, D.
    Lee, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1061893.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Hd
    Opis:
    Mixed oxides of Ti-V-O were co-precipitated by wet process using TiCl₄ and VOCl₃ as starting materials. As-precipitated gels were calcinated at 800°C for 4 hours in oxygen atmosphere. Effects of vanadium content on the structural evolution, morphology, and band gap of Ti-V-O oxides were investigated. Calcination has produced mixtures of TiO₂/VO₂/V₂O₅ oxides and has allowed formation of Ti_{1-x}V_{x}O₂. Lattice parameters of rutile TiO₂ were precisely measured to investigate vanadium substitution into single rutile phase of Ti_{1-x}V_{x}O₂ with varying vanadium content. As vanadium addition was increased, particles were coarsening rapidly during calcination. Band gap of the Ti-V-O oxides was measured using ultraviolet visible light spectrometer. A decrease of band gap down to 1.7 eV with the addition of maximum of 10 at.% of vanadium was measured, which is due to the formation of single phase of Ti_{1-x}V_{x}O₂ as well as the formation of metallic VO₂ or V₂O₅ particles.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 875-877
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of Palm Oil Boiler Ash Biomass Waste as a Source of Silica with Various Preparation Methods
    Autorzy:
    Bukit, Bunga Fisikanta
    Frida, Erna
    Humaidi, Syahrul
    Sinuhaji, Perdinan
    Bukit, Nurdin
    Powiązania:
    https://bibliotekanauki.pl/articles/2173346.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    silica
    coprecipitation
    ball milling
    methyl trichlorosilane
    Opis:
    Several studies have synthesized silica from waste. The silica synthesis method from agricultural waste aims to produce high purity silica with low contaminants at an affordable cost. This study synthesized silica from oil palm boiler ash (OPBA) by means of various methods, such as ball milling, coprecipitation, and modification with methyl trichlorosilane (MTCS). XRD characterization results showed that the OPBA synthesized with ballmill and coprecipitation method has the smallest particle size of 14.90 nm. Morphology showed the OPBA obtained by using the ballmill method, the OPBA synthesized with ballmill and coprecipitation method, as well as the OPBA synthesized with ballmill, coprecipitation, and modified with methyl trichlorosilane as spherical particles. At the same time, the FTIR results show an absorption peak which is a characteristic of silica confirmed by the XRF results, where silica content is dominant.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 8; 193--199
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Economically viable synthesis of Fe3O4 nanoparticles and their characterization
    Autorzy:
    Srivastava, V.
    Singh, P. K.
    Weng, C. H.
    Sharma, Y. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/778707.pdf
    Data publikacji:
    2011
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    nanożelazo
    żelazo
    synteza
    współstrącanie
    charakterystyka
    pH zpc
    nano iron
    synthesis
    coprecipitation
    characterization
    Opis:
    Nano iron oxide particles (Fe3O4) were synthesized by coprecipitation of Fe2+ and Fe3+ by ammonia solution in the aqueous phase. Various instrumentation methods such as X ray Diffractometry (XRD), Transmission Electron Microscopy (TEM), Fourier Transform Infrared (FTIR) spectroscopy, Brunauer-Emmett-Teller (BET) and Vibrating Sample Magnetometery (VSM) were used to characterize the properties of nanoparticles. The size of the nanoparticles was measured and was found to be between 10 to 15 nm. The value of saturation magnetization of the nanoparticles was found to be 55.26 emu/g. The BET surface area of nano iron oxide particles measured to be 86.55 m2/g.
    Źródło:
    Polish Journal of Chemical Technology; 2011, 13, 2; 1-5
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Nd³⁺ doping on magnetic and dielectric properties of SrFe₁₂O₁₉ hexaferrite synthesized by coprecipitation method
    Autorzy:
    Hilczer, A.
    Pasińska, K.
    Markiewicz, E.
    Pietraszko, A.
    Andrzejewski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1047614.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Gg
    75.60.Ej
    75.75.+a
    81.20.Fw
    Opis:
    Magnetic and dielectric properties of hexagonal ferrites important for applications in microwave absorbers are strongly determined by the processing conditions. We studied dielectric and magnetic response of Sr_{1-x}Nd_{x}Fe₁₂O₁₉ (x=0, 0.03, 0.05, 0.07, 0.09) solid solutions obtained by coprecipitation method. The structure of the samples was controlled by X-ray diffraction and scanning electron microscope images revealed that the powder is a mixture of small nanograins and crystallites of 500 nm-1 μm in size. Nd³⁺ doping was found to result in an increase in the coercive field which we would like to relate to the domain wall pinning. The doping-induced changes are monotonous with x up to 0.07. The observed dispersion of permittivity was found to be correlated with the frequency behaviour of electric conductivity of the samples.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 669-672
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A comparison of selected natural radionuclide concentrations in the thermal groundwater of Mszczonów and Cieplice with deep well water from Łódź city, Poland
    Autorzy:
    Grabowski, P.
    Długosz, M.
    Szajerski, P.
    Bem, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/148418.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    thermal groundwater
    natural radionuclides
    ICP-MS
    coprecipitation
    Opis:
    A simple procedure using α and γ spectrometry for the determination of natural radionuclides in two Polish geothermal water samples from Mszczonów and Cieplice, as well as in deep well groundwater from the city of Łódź, was described. The 222Rn radionuclide was directly extracted from 10 cm3 water samples to a scintillator solution placed in scintillation vials and determined by an liquid scintillation (LSC) technique with α/β separation. The activity concentrations of three radium nuclides: 228Ra(228Ac), 226Ra(222Rn), 224Ra, as well as 210Pb and 228Th were measured by γ spectrometry with an HPGe detector after their preconcentration on hydrated MnO2. 210Po was deposited on a silver disc from dissolved MnO2 precipitate after γ-spectrometry analysis and measured by α spectrometry. The concentration of 210Pb in the examined samples was below the detection limit of the method (< 6.2 mBq/dm3), whereas activity of its decay product 210Po was in the range 0.35–1.4 mBq/dm3. Higher activities of 228Ra (46.7 mBq/dm3), 226Ra (67.8 mBq/dm3) and 224Ra (22.4 mBq/dm3) were observed for the deep well water in Łódź in comparison to those for geothermal water samples from Cieplice and Mszczonów. However, concentrations of all the measured radionuclides were below World Health Organization (WHO) reference activities (0.1 Bq/dm3 for 228Ra and 1 Bq/dm3 for 226Ra and 226Ra).
    Źródło:
    Nukleonika; 2010, 55, 2; 181-185
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Properties and activity of the cobalt catalysts for NH3 &enspsynthesis obtained by co-precipitation – the effect of lanthanum addition
    Autorzy:
    Zybert, M.
    Karasińska, M.
    Truszkiewicz, E.
    Mierzwa, B.
    Raróg-Pilecka, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/778653.pdf
    Data publikacji:
    2015
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    ammonia synthesis
    cobalt catalyst
    promoter
    lanthanum
    coprecipitation
    Opis:
    In modern research on catalysts for NH3&enspsynthesis a lot of attention is paid to cobalt. In this work the new catalytic systems based on cobalt are presented. Unsupported cobalt catalysts singly promoted (La or Ba) and doubly promoted (La and Ba) were prepared and tested in NH3&enspsynthesis reaction under commercial synthesis conditions. Characterization studies revealed that lanthanum plays a role of a structural promoter, which improves the surface of catalyst precursors and prevents from sintering during calcination. However, lanthanum has a negative effect on the reduction of cobalt oxide, but the addition of barium promoter (Co/La/Ba catalyst) diminishes the negative impact of La. The co-promotion of cobalt with lanthanum and barium results in the increasing of the active phase surface and improvement of its activity in NH3&enspsynthesis.
    Źródło:
    Polish Journal of Chemical Technology; 2015, 17, 1; 138-143
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improving the Performance of Mg/Cr LDH by Forming Metal Oxides Mg/Cr-Ni Using Coprecipitation Method as Adsorbent for Cationic Dyes
    Autorzy:
    Yuliasari, Nova
    Badri, Arini Fousty
    Siregar, Patimah Mega Syah Bahar Nur
    Palapa, Neza Rahayu
    Mardiyanto
    Mohadi, Risfidian
    Lesbani, Aldes
    Powiązania:
    https://bibliotekanauki.pl/articles/2105268.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    adsorption
    metal oxide
    rhodamine B
    methylene blue
    regeneration
    Opis:
    This study aimed to determine the adsorption capacity of rhodamine-B (Rh-B) and methylene blue (MB) on Mg/Cr-Ni adsorbents. The Mg/Cr-Ni adsorbent was synthesized by the coprecipitation method. The results of the characterization of Mg/Cr-Ni using XRD analysis showed the formation of oxides at an angle of 2θ = 31.726°, 33°, and 45.44°. The surface area of Mg/Cr-Ni is 23.139 m2/g. The adsorption capacity test for Mg/Cr-Ni for Rh-B and MB were 85.470 mg/g and 166.667 mg/g, respectively. The adsorption kinetics model followed the pseudo second order (PSO). The adsorption process is endothermic and occurs spontaneously at any temperature. Mg/CrNi showed stability in the adsorption process of Rh-B and MB for 5 regeneration cycles.
    Źródło:
    Journal of Ecological Engineering; 2022, 23, 6; 67--74
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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