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    Wyświetlanie 1-44 z 44
    Tytuł:
    Physiological Analysis of Cuo Bulk and Nanoparticles to Castor (Ricinus Communis L.)
    Autorzy:
    Mahmoodzadeh, Homa
    Eshaghi, Ali
    Gholami, Tayebeh
    Powiązania:
    https://bibliotekanauki.pl/articles/2199669.pdf
    Data publikacji:
    2016-12-20
    Wydawca:
    Instytut Hodowli i Aklimatyzacji Roślin
    Tematy:
    bulk CuO
    CuO nanoparticles
    germination index
    Ricinus communis
    TTC test
    Opis:
    The rapidly increasing multifarious use of metallic nanoparticles in technology has necessitated evaluation of their impact on environmental, biotic and human health. The present study investigated the effects of different concentrations of bulk and nanosized CuO on seed germination and seedling growth of Ricinus communis in a randomized completely design with four replications. The experimental treatments included four concentrations of bulk CuO (10, 50, 100 and 500 ppm), four concentrations of nanosized CuO (10, 50, 100 and 500 ppm), and the control without CuO. The results indicate that only the weighted germination index and seedling dry biomass of Ricinus communis were significantly affected by the treatments. Other germination characteristics, plumule and radicle length, and seedling fresh weight were not significantly affected by bulk and nanosized CuO concentrations. It can be concluded that bulk and nanosized CuO in this cocentrations not toxic for germination and growth of Ricinus communis.
    Źródło:
    Plant Breeding and Seed Science; 2016, 74; 45-55
    1429-3862
    2083-599X
    Pojawia się w:
    Plant Breeding and Seed Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Facile synthesis of chitosan/CuO nanocomposites for potential use as biocontrol agents
    Autorzy:
    Siriphannon, P.
    Iamphaojeen, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/201687.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    chitosan
    CuO
    nanocomposite
    hydrothermal
    antibacterial activity
    chitozan
    nanokompozyt
    aktywność przeciwbakteryjna
    Opis:
    Chitosan/CuO nanocomposites (Chi/CuO) were prepared by facile and eco-friendly technique. The 2%w/v chitosan solution was mixed with 0.5 %w/w sodium tripolyphosphate (STPP), resulting in the formation of ionically crosslinked chitosan. The crosslinked chitosan was soaked in an aqueous solution containing 0.001, 0.01 or 0.1 mol/L CuSO4·5H2O for 24 hrs, in which the Cu2+ ions were absorbed into the chitosan network, forming as the chitosan/Cu2+ precursors. The chitosan/Cu2+ precursors were hydrothermally reacted in two different basic media, i.e. NaOH and NH4OH, at 100°C for 24 hrs, resulting in the nano-sized CuO crystals hydrothermally grew and embedded in the crosslinked chitosan matrix. The CuO grown in the NaOH possessed larger crystallite size and higher crystallinity than that in the NH4OH. In addition, the CuO crystallite size in the nanocomposites increased with the increase of initial concentration of Cu2+ starting agent due to the increase of Cu2+ quantity in the chitosan/Cu2+ precursors. The chitosan/CuO nanocomposites prepared by using 0.01 and 0.1 mol/L Cu2+ could exhibit the antibacterial activities after intimate contact with Staphylococcus aureus and Escherichia coli under JIS L 1902:1998 (Qualitative) test method, indicating their potential use as biocontrol agents.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 3; 311-316
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave Assisted Fast Synthesis of CuO Nanoflakes: Catalytic Application in the Synthesis of 1,4-Dihydropyridine
    Autorzy:
    Bajaj, S.
    Tekade, P.
    Lakhotiya, G.
    Borkar, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032600.pdf
    Data publikacji:
    2017-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    microwave irradiation
    CuO nanoflakes
    catalyst
    dihydropyridine
    Opis:
    CuO nanoflakes were successfully synthesized by microwave irradiation, using copper(II) sulphate and sodium hydroxide (NaOH) as the starting materials and ethanol as the solvent. The CuO nanoflakes were characterized by using techniques such as X-ray powder diffraction, field emission scanning electron microscopy, and UV-visible absorption spectroscopy, Fourier transform infra-red spectroscopy. The synthesized CuO nanoflakes were found to have morphology like nanoflakes with narrow size distribution and high purity. Moreover, the synthesized CuO nanoflakes were used as an efficient catalyst for synthesis of a series of dihydropyridine derivatives. Optimization studies with different catalysts and solvents reveal that CuO nanoparticle in the water/ethanol mixture is efficient catalyst/solvent system for the synthesis of dihydropyridine derivative.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 4; 1294-1300
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural and Optical Properties of CuO Doped (Li) Thin Films Prepared by Sol-Gel Technique
    Autorzy:
    Kadhim, Raheem G.
    Kzar, Kzar
    Powiązania:
    https://bibliotekanauki.pl/articles/1188084.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    CuO
    Li
    Sol-gel
    spin coating
    x-ray diffraction
    UV- Visible
    Opis:
    CuO and (Li–doped CuO) thin films have been prepared on glass substrates by sol-gel method using spin coating technique. X-ray diffraction (XRD) results reveal that the deposited CuO and (Li– doped CuO) thin films monoclinic crystal structure and the grain size increase with increasing concentration Li. The optical transition in the CuO and (Li– doped CuO) thin films are observed to be allowed direct transition. The value of the optical energy gap decreases with increasing of (Li) for all samples.
    Źródło:
    World Scientific News; 2016, 56; 56-66
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlation between Microstructure and Exothermic Reaction Kinetics of Al-CuO Thermite Nanocomposite Powders Fabricated by Cryomilling
    Autorzy:
    Oh, Minseok
    Kim, Kwanil
    Ahn, Byungmin
    Powiązania:
    https://bibliotekanauki.pl/articles/355529.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-CuO
    thermite
    nanocomposite
    cryomilling
    high energy density materials
    Opis:
    Al-CuO is a thermite material exhibiting the exothermic reaction only when aluminum melts. For wide spread of its applica-tion, the reaction temperature needs to be reduced in addition to the enhancement of total reaction energy. In the present study, a thermite nanocomposite with a large contact area between Al and CuO was fabricated in order to lower the exothermic reaction temperature and to improve the reactivity. A cryomilling process was performed to achieve the nanostructure, and the effect of composition on the microstructure and its reactivity was studied in detail. The microstructure was characterized using SEM and XRD, and the thermal property was analyzed using DSC. The results show that as the molar ratio between Al and CuO varies, the fraction of uniform nanocomposite structure was changed affecting the exothermic reaction characteristics.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 931-934
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Cd Doping on Structural and Some Optical Studies of Nano CuO Films Prepared by Sol–Gel Technique
    Autorzy:
    Kadhim, Raheem G.
    Ban, Raheem Saleh Kzar
    Powiązania:
    https://bibliotekanauki.pl/articles/1182823.pdf
    Data publikacji:
    2017
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Cd
    CuO
    Sol–Gel Spin Coating Technique
    Thin Film
    Opis:
    This research deals with the study of the structural and optical properties of CuO and Cd doped CuO nano films in thickness 100nm were deposited on a glass substrate using sol-gel spin coating technique. XRD results indicated that the films are polycrystalline and have monoclinic structure with a preferred orientation along ((111).) ̅ and the grain size increase with increasing concentration Cd. Data of AFM indicate that the surface of films is smooth. From SEM image observed the particles are smallest an even particle distribution on a smooth surface. The optical transition in the CuO and (Cd– doped CuO) thin films are observed to be allowed direct transition. The value of the optical energy gap decreases with increasing of (Cd) for all samples.
    Źródło:
    World Scientific News; 2017, 64; 69-83
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    XPS Study of "infinite Chain" Ca$\text{}_{2}$CuO$\text{}_{3}$ and Ca$\text{}_{0.5}$Sr$\text{}_{0.5}$CuO$\text{}_{2}$ Compounds
    Autorzy:
    Jacyna-Onyszkiewicz, I.
    Poltoracky, Yu. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013234.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    74.72.-h
    74.72.Jt
    Opis:
    Al K$\text{}_{α}$ excited photoelectron spectra (X-ray photoelectron spectroscopy) of the O 1s, Cu 2p, Ca 2p, Sr 3d core levels were measured for "infinite chain" Ca$\text{}_{2}$CuO$\text{}_{3}$ and Ca$\text{}_{0.5}$Sr$\text{}_{0.5}$CuO$\text{}_{2}$ compounds. The analysis indicates that for Ca$\text{}_{2}$CuO$\text{}_{3}$ the surface electronic structure is strongly influenced by a humid atmosphere. The surface layer is formed predominantly by copper hydroxide. The minor features of Cu 2p and O 1s are characteristic of the bulk bonding states. The valences of the Cu, Ca, and Sr atoms are close to 2+. The core electron binding energies (≈ 934 eV peak) are due to the 2p$\text{}_{3}\text{}_{/}\text{}_{2}$ 3d$\text{}^{10}$L$\text{}^{1}$ configuration of Cu(II) ions in the square planar coordination for both samples.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 603-606
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synteza metanolu z ditlenku węgla i wodoru na bazie katalizatora CuO/ZnO/ZrO2 z dodatkami
    Methanol Synthesis from Carbon Dioxide and Hydrogen over CuO/ZnO/ZrO2 promoted catalysts
    Autorzy:
    Madej-Lachowska, A.
    Kasprzyk-Mrzyk, A.
    Moroz, H.
    Lachowski, A. I.
    Wyżgoł, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1215619.pdf
    Data publikacji:
    2014
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
    Tematy:
    synteza metanolu
    katalizator CuO/ZnO/ ZrO2
    promotory – Ce, Cr, Ga, La, Pd
    methanol synthesis
    Cu/ZnO/ZrO2 catalyst
    Ce, Cr, Ga, La, Pd promoters
    Opis:
    Przeprowadzono badania wpływu promotorów Ce, Cr, Ga, La i Pd na aktywność katalizatora CuO/ZnO/ZrO2 w procesie syntezy metanolu z CO2 i H2. Katalizator otrzymano metodą homogenizacji z zastosowaniem kwasu cytrynowego wprowadzając niewielkie ilości promotorów. Aktywność katalizatorów badano prowadząc pomiary w ciśnieniowym reaktorze rurowym o stałym złożu katalizatora. Wykazano pozytywny wpływ promotorów, zwłaszcza Ga, La, Ce oraz Cr, na aktywność i selektywność katalizatora w badanym procesie.
    It has been well documented that the CuO/ZnO/ZrO2 catalyst shows high activity in the methanol synthesis from CO2 and H2. The CuO/ZnO/ZrO2 based catalysts were obtained by decomposing the citrate complexes, by adding small amount of promoters – Ce, Cr, Ga, La, Pd in order to improve the new catalyst’s catalytic properties. The catalytic activity was measured using a tubular high-pressure fixed bed reactor. The promoters were found to improve the catalytic activity and stability in the reaction of methanol synthesis from carbon dioxide and hydrogen. The positive influence of promoters, especially Ga, La, Ce and Cr on the activity and selectivity of the developed catalysts in the investigated process has been demonstrated.
    Źródło:
    Chemik; 2014, 68, 1; 61-68
    0009-2886
    Pojawia się w:
    Chemik
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polaron States in a CuO Chain
    Autorzy:
    Bieniasz, K.
    Oleś, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1385209.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.10.Di
    75.10.Pq
    75.50.Ee
    Opis:
    We introduce a one-dimensional model for a CuO chain, with holes and S=1/2 spins localized in $3d_{x²-y²}$ orbitals, and p_σ oxygen orbitals without holes in the ground state. We consider a single hole doped at an oxygen site and study its propagation by spin-flip processes. We develop the Green function method and treat the hole-spin coupling in the self-consistent Born approximation, similar to that successfully used to study polarons in the regular t-J model. We present an analytical solution of the problem and investigate whether the numerical integration is a good approximation to this solution.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 269-271
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Drag reduction in the flow of CuO based nanofluid
    Redukcja oporów przepływu w nanopłynie zawierającym cząstki CuO
    Autorzy:
    Gierczycki, A.
    Drzazga, M.
    Lemanowicz, M.
    Dzido, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2072813.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    nanofluid
    surfactant
    CTAC (cetyltrimethylammonium chloride)
    NaSal (sodium salycilate)
    drag reduction
    nanopłyn
    surfaktant
    CTAC (chlorek cetylotrimetyloamoniowy)
    NaSal (salicylan sodu)
    obniżenie oporów przepływu
    Opis:
    Experimental studies on drag reduction (DR) of CuO based nanofluid with the additives of mixture of cationic surfactant CTAC (cetyltrimethylammonium chloride) and sodium salycilate - NaSal were performed. The obtained results were compared with those for water solution of CTAC/NaSal. Values of pressure drop were measured in specially designed laboratory setup equipped with measuring tubes of three different diameters - 4, 8 and 12 mm. It was found that the addition of surfactant and sodium salycilate mixture to nanofluid decreased its pressure drop during flow, however the drag reducing effect was greater for pure water. The DR effect obtained was in the range of 20 ÷ 70% for CuO based nanofluid. The diameter effect was also observed - the DR coefficient was greater for pipes of smaller inner diameters.
    Przeprowadzono badania eksperymentalne dotyczące obniżenia oporów przepływu (DR) w nanopłynie z cząstkami CuO oraz dodatkiem mieszaniny kationowego surfaktantu CTAC (chlorek cetylotrimetyloamoniowy) i salicylanu sodu - NaSal. Otrzymane wyniki porównano z otrzymanymi dla wodnego roztworu CTAC/NaSal. Wartości oporów przepływu mierzono w specjalnie w tym celu zaprojektowanej instalacji laboratoryjnej wyposażonej w rurki pomiarowe o trzech różnych średnicach - 4, 8 i 12 mm. Stwierdzono, że dodatek mieszaniny surfaktantu i salicylanu sodu do nanopłynu zmniejsza jego opory przepływu w rurze, lecz w mniejszym stopniu niż dla czystej wody. Uzyskano współczynnik DR dla nanopłynu zawierającego cząstki CuO w zakresie 20 ÷70%. Zaobserwowano także wpływ średnicy rurki - współczynnik DR był większy dla rurek o mniejszej średnicy.
    Źródło:
    Inżynieria i Aparatura Chemiczna; 2015, 1; 8--9
    0368-0827
    Pojawia się w:
    Inżynieria i Aparatura Chemiczna
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Amelioration of Ultrasonic Transducer to Study CuO Doped Thin Films
    Autorzy:
    Barakat, M. A. Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/176534.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ultrasonic
    thin films
    doping
    microstructure
    wedge
    Opis:
    Ultrasonic pulse echo technique was used to study cupric oxide (CuO) thin films. CuO thin films were prepared using sol gel technique. They were doped with Lithium (Li) (1%, 2% and 4%). Thin films’ thickness (d) and band gap energy (Eg) were measured. In addition, elastic moduli (longitudinal (L), shear (G), bulk (K) and Young’s (E)) and Poisson’s ratio (v) were determined to estimate the microstructure properties of the prepared films. The study ameliorated the used transducers to overcome their dead zone and beam scattering; wedges were developed. The results showed the effectiveness of these wedges. They enhanced transducers’ sensitivity by changing the dead zone, beam diameter, beam directivity and waves’ transmission. Also, the study noted that Li doping caused the improvement of CuO thin films to be more useful in solar cell fabrication. Li-CuO thin films had narrower band gap. Thus, they acquired a high quantum yield for the excited carriers; also they gained more efficiency to absorb solar light.
    Źródło:
    Archives of Acoustics; 2018, 43, 3; 487-495
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrothermally Synthesized CuO Powders for Photocatalytic Inactivation of Bacteria
    Autorzy:
    Azimirad, R.
    Safa, S.
    Akhavan, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400560.pdf
    Data publikacji:
    2015-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.50.Hp
    82.50.-m
    Opis:
    Various morphologies of monoclinic CuO powders were synthesized by hydrothermal treatment of copper nitrate, copper acetate or copper sulfate. The synthesized samples were characterized by scanning electron microscopy, X-ray diffractometry, the Fourier transform infrared spectroscopy, and diffuse reflectance spectrophotometry. Antibacterial activity of the samples was studied against Escherichia coli bacteria in dark and under visible light irradiation. Although the different precursors yielded the same band gap energies ( ≈1.6 eV) for the synthesized CuO samples, they resulted in various morphologies (hierarchy of stabilized micro/nanostructures), specific surface areas, concentrations of OH-surface groups, and visible light photocatalytic performances. The CuO nanorods synthesized from nitrate hydrothermal bath not only exhibited a considerable effective surface area, but also showed the highest concentration of absorbed OH-groups and subsequently, the strongest (photo)catalytic antibacterial properties ( ≈37 and 94% inactivation of the bacteria in dark and under visible light irradiation, respectively).
    Źródło:
    Acta Physica Polonica A; 2015, 127, 6; 1727-1731
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mixed Valence Quasiparticles in CuO$\text{}_{2}$ Planes
    Autorzy:
    Bała, J.
    Oleś, A. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1955491.pdf
    Data publikacji:
    1997-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Jb
    75.30.Ds
    75.10.Lp
    Opis:
    The motion of a single hole doped to a CuO$\text{}_{2}$ plane of a high temperature superconductor is described by a spin-fermion model which treats explicitly the hybridization with the upper Hubbard band. One finds that sectors of Zhang-Rice bound states coexist with reasonably damped oxygen and copper-like quasiparticles, with a considerable transfer of the spectral weight to the upper Hubbard band. The oxygen states have small dispersions and can be identified in the angle-resolved photoemission experiments for Bi$\text{}_{2}$Sr$\text{}_{2}$CaCu$\text{}_{2}$O$\text{}_{8}$.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 2; 333-336
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrophoretic deposition and characterization of CuO/GtO/HA/SA coatings on titanium alloy
    Autorzy:
    Warcaba, Maciej
    Moskalewicz, Tomasz
    Hadzhieva, Zoya
    Boccaccini, Aldo R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1844804.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
    Źródło:
    Engineering of Biomaterials; 2021, 24, 163; 53
    1429-7248
    Pojawia się w:
    Engineering of Biomaterials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser-Assisted Copper Oxidation
    Autorzy:
    Musztyfaga-Staszuk, M.
    Gawlińska-Nęcek, K.
    Janicki, D.
    Panek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/353054.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Cu
    CuO
    Cu2O
    laser micro-processing
    Opis:
    The paper proposes a method for copper sheet oxidation by using a laser beam. The thickness of the oxide layer increases with temperature growth; therefore, the proper parameters of the experiment such as pulse power, frequency and the speed of the beam were adjusted. High power diode laser was used in the investigations. The topography of the oxidised copper sheets was determined using atomic force microscopy (AFM) and scanning electron microscopy with EDS analyses. Optical parameters of the deposited layer were characterised by spectrophotometry. Both roughness and thickness of the investigated samples were measured using the confocal laser scanning microscope. The technological recommendations for the laser micro-machining technology to obtain copper sheet oxidation by using the high power laser beam were selected.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 767-770
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interaction of the Components in the $BaO-Tb_2 O_{3+δ}-CuO$ and Related Systems
    Autorzy:
    Zaremba, O.
    Gladyshevskii, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398239.pdf
    Data publikacji:
    2018-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Fn
    Opis:
    The isothermal section of the phase diagram of the $BaO-Tb_2 O_{3+δ}-CuO$ system at 1173 K was constructed based on X-ray powder diffraction data. The existence of the compounds BaTbO₃ (SrZrO₃ structure type, I4/mcm, a = 0.6034(1), c = 0.8576(1) nm) and Ba₄₄Cu₄₅O₉₀ (own structure type, Im-3m, a =1.8266(3) nm) was confirmed in the binary BaO-Tb₂O₃ and BaO-CuO systems, respectively, but no ternary oxides were found. The investigation of samples with nominal composition $A_{0.5}Tb_{0.5}TO_3$ (A = Ca, Sr or Ba, T = Ni or Zn) showed the presence of phases from the corresponding binary systems, or unreacted reagents.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 4; 1024-1026
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of inorganic oxide composites with the use of postgalvanic waste solutions of copper(II) sulfate
    Autorzy:
    Modrzejewska-Sikorska, A.
    Ciesielczyk, F.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/779557.pdf
    Data publikacji:
    2010
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    powierzchnia
    tlenek złożonych CuO.SiO2
    rozkład wielkości cząsteczek
    powierzchnia właściwa
    właściwości kalorymetryczne
    opady
    oxide composite CuO.SiO2
    waste solution of copper(II) sulfate
    precipitation
    particle size distribution
    surface area
    colorimetric characteristics
    Opis:
    The study was undertaken to obtain an oxide composite (inorganic colourful pigment) in the method based on the use of postgalvanic waste solution of copper(II) sulfate. The conditions of the process of precipitation of synthetic CuOźSiO 2 were optimised by checking the effect of the concentration and the volume ratio of the reagents and the temperature on the physico-chemical parameters of the final product. The oxide composite obtained in the optimum conditions was characterised by high refinement of particles and large specific surface area BET of 326 m2/g.
    Źródło:
    Polish Journal of Chemical Technology; 2010, 12, 2; 46-51
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum versus Classical Polarons in a Ferromagnetic $CuO_3$-Like Chain
    Autorzy:
    Bieniasz, K.
    Oleś, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374771.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.10.Di
    75.10.Pq
    75.50.Dd
    79.60.-i
    Opis:
    We present an exact solution for an itinerant hole added into the oxygen orbitals of a $CuO_{3}$-like ferromagnetic chain. Using the Green function method, the quantum polarons obtained for the Heisenberg SU(2) interaction between localized Cu spins are compared with the polarons in the Ising chain. We find that magnons with large energy are favorable towards quasiparticle existence, even in the case of relatively modest electron-magnon coupling. We observe two quasiparticle states with dispersion ~2t each, which emerge from the incoherent continuum when the exchange coupling J increases. Quantum fluctuations in the spin system modify the incoherent part of the spectrum and change the spectral function qualitatively, beyond the bands derived from the perturbation theory.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4a; A-80-A-83
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Susceptibility of Sr$\text{}_{2}$CuO$\text{}_{3}$ and SrCu$\text{}_{2}$O$\text{}_{3}$
    Autorzy:
    Johnston, D. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953177.pdf
    Data publikacji:
    1997-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.Jt
    74.25.Ha
    75.40.Cx
    Opis:
    The observed magnetic susceptibility χ$\text{}^{obs}$(T) data of Ami et al. for the linear-chain cuprate Sr$\text{}_{2}$CuO$\text{}_{3}$ are re-analyzed in terms of recent theory of Eggert et al. for the spin susceptibility χ(T) of the spin S=1/2 linear-chain Heisenberg antiferromagnet, which yielded the Cu-Cu exchange constant J/k$\text{}_{B}$=2150 K. Values for J', the exchange constant in the rungs, and J, that in the legs, were estimated for the S=1/2 two-leg ladder compound SrCu$\text{}_{2}$O$\text{}_{3}$, using the χ(T) data of Azuma et al. The analyses suggest that J'/J ≈ 0.5, contrary to the expectation that J'/J ≈ 1, and that J/k$\text{}_{B}$ is very large ( ≈ 2000 K), similar to that in Sr$\text{}_{2}$CuO$\text{}_{3}$.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 1; 181-189
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of the active phase structure in CuO/γ-Al$\text{}_{2}$O$\text{}_{3}$catalysts by TPR kinetic model discrimination
    Autorzy:
    Kuśtrowski, P.
    Białas, A.
    Surman, J.
    Dudek, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2080034.pdf
    Data publikacji:
    2010-01-01
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Opis:
    The results of temperature-programmed reduction with hydrogen of alumina supported copper oxide catalysts were used to find the best model describing the kinetics of Cu ions' reduction. On the basis of the rate determining step of this reaction the structure of copper oxide was revealed. This kinetic approach was compared with BET and UV-vis-DRS results. The catalytic activity of various copper oxide forms was tested in toluene combustion.
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2010, 65; 68-78
    2083-358X
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations on heat and momentum transfer in CuO-water nanofluid
    Autorzy:
    Dzido, G.
    Drzazga, M.
    Lemanowicz, M.
    Gierczycki, A. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/240561.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanofluids
    fluid mechanics
    heat transfer
    nanopłyny
    mechanika płynów
    przenikanie ciepła
    Opis:
    This paper presents results of investigations on the application of CuO-water nanofluids for intensification of convective heat transfer. Performance of nanofluids with 2.2 and 4.0 vol.% CuO NPs (nanoparticles) content were examined with regard to heat transfer coefficient and pressure losses in case of turbulent flow in a tube. Negligible impact of examined nanofluid on heat transfer improvement was found. Moreover, measured pressure losses significantly exceeded those determined for primary base liquid. The observations showed that application of nanofluid for heat transfer intensification with a relatively high solid load in the examined flow range is rather controversial.
    Źródło:
    Archives of Thermodynamics; 2015, 36, 2; 49-59
    1231-0956
    2083-6023
    Pojawia się w:
    Archives of Thermodynamics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Post Growth Annealing on the Structural and Electrical Properties of ZnO/CuO Composite Nanostructures
    Autorzy:
    Hussain, Mushtaque
    Khan, Azam
    Nur, Omer
    Willander, Magnus
    Powiązania:
    https://bibliotekanauki.pl/articles/1205261.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Rs
    81.40.-z
    Opis:
    In the present work, ZnO/CuO composite nanostructures have been grown on fluorine doped tin oxide coated glass substrate by aqueous chemical growth method. To observe the effect of post growth annealing (500°C, 1 min) on the structural properties of ZnO nanorods scanning electron microscope and X-ray diffraction techniques have been utilized. SEM images of post growth annealed (post growth annealed) sample reveal that the average diameter of ZnO NRs has considerably increased in comparison with as grown sample. Moreover after post growth annealing the ZnO NRs showed more clearly hexagonal wurtzite structure. Beside this the NRs are also uniform and well aligned with a high aspect ratio of $~10$. In XRD pattern the strongly intense (002) peak of the post growth annealing sample suggest that the crystal quality of the NRs have also been improved significantly. Since the structural improvement have a significant impact on charge transport properties as well, therefore the effect of post growth annealed has also been investigated by the electrical characterization of ZnO/CuO based heterojunction. The current-voltage measurements of the post growth annealed sample showed improvement in the current in comparison with as grown sample. The impedance study has also confirmed that the post growth annealed has influence on the electrical properties. The presented post growth annealed heterojunction of ZnO/CuO may have space in applications like sensors and oxide based diodes in the devices fabrication.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 3; 849-854
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
    Artykuł
    Tytuł:
    Hopping Conduction Mechanism in Amorphous CuO-Bi$\text{}_{2}$O$\text{}_{3}$ Pellets
    Autorzy:
    Motke, S. G.
    Burghate, D. K.
    Gawande, W. J.
    Pakade, S. V.
    Yawale, S. P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931822.pdf
    Data publikacji:
    1994-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Ng
    72.90.+y
    Opis:
    The transport properties of CuO-Bi$\text{}_{2}$O$\text{}_{3}$ pellets (pressed at room temperature 303 K) like dc electrical conductivity etc. are measured. The activation energy, dielectric constant etc. are reported. The hopping conduction is examined. Non-adiabatic hopping conduction is observed. The plot of -log σ versus 1/T is found to be linear. Activation energy of pellets containing CuO (80, 70, 60 mol%) shows electronic conduction while the pellet containing CuO (50 mol%) shows ionic conduction. The effect of content of CuO (mol%) and frequency on dielectric constant is also studied. The variation of dielectric constant with CuO (mol%) shows zigzag nature and may be due to the relaxation effects.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 6; 969-978
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Controlled Synthesis and Application of Nano-energetic Materials Based on the Copper Oxide/Al System
    Autorzy:
    He, S.
    Chen, J.
    Yang, G.
    Qiao, Z.
    Li, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/358254.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    nanoenergetic material
    CuO/Al
    laser ignition
    plate-like
    hollow sphere
    Opis:
    Nanothermite composites containing metal oxide and metal fuel are attracting attention due to their outstanding combustion characteristics. The morphology of metal oxide is important for the performance of nanothermite composites. In this paper, branch-, plate-, sphere-, and hollow sphere-like CuO nano/microstructures were synthesized via a facile hydrothermal process. The CuO/Al based nanothermites were prepared via ultrasonic mixing of the asobtained CuO products and nano-Al. The combustion behaviour of CuO/Al based nanothermites was analyzed by DSC and laser ignition. This study shows that this nanoscale mixing resulted in a large interfacial contact area and low diffusional resistance between the fuel and the oxidizer, and the reaction reflects large energy and laser ignition sensitivity.
    Źródło:
    Central European Journal of Energetic Materials; 2015, 12, 1; 129-144
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Copper Deficiency - a Crystallochemical Nature of Ce-Doped Gd$\text{}_{2}$CuO$\text{}_{4}$ Phase. Part II
    Autorzy:
    Horyń, R.
    Bukowska, E.
    Sikora, A.
    Wołcyrz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041471.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.75.+g
    81.40.Rs
    75.50.-y
    72.20.My
    Opis:
    Two samples of nominal composition Gd$\text{}_{1.80}$Ce$\text{}_{0.15}$CuO$\text{}_{4.0}$ and Gd$\text{}_{1.85}$Ce$\text{}_{0.15}$CuO$\text{}_{4.075}$ were subjected for a long-term treatment in air at 1100°C, comprised with a precise control of their weights vs. time of the treatment applied. The gravimetric analysis and the iodometric titration, both showed a deficiency on Cu-site, steadily increasing vs. time with a slight tendency to a saturation. The X-ray analysis of the resulting products showed that even after 272 h of sintering, the samples remained single phase of the "214" structure type. Refinement of their crystal structures as well as density measurements, both allowed confirming Cu deficient structure constitution of these samples. Results of dc-magnetization measurements, performed prior to reduction of the sample's overall oxygen content, did not show any sign of superconductivity down to 4.2 K. These preliminary results indicate that copper deficiency, developing during synthesis, may occur to be a decisive factor for the reported lack of superconductivity in Ce-doped Gd$\text{}_{2}$CuO$\text{}_{4}$ phase. Oxygen content reduction and further tests on the samples obtained are in progress.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 733-738
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    STM/AFM Images and Tunneling Spectra of Nd$\text{}_{2-x}$Ce$\text{}_{x}$CuO$\text{}_{4-y}$ Single Crystals
    Autorzy:
    Susła, B.
    Sadowski, W.
    Klimczuk, T.
    Czajka, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964375.pdf
    Data publikacji:
    1997-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.16.Ch
    74.72.Jt
    68.35.Bs
    Opis:
    The results of the scanning tunneling microscopy and spectroscopy as well as atomic force microscopy measurements on the Nd$\text{}_{2-x}$Ce$\text{}_{x}$CuO$\text{}_{4-y}$ single crystals in ambient conditions are reported. Using the scanning tunneling microscopy we were able to modify the Nd$\text{}_{2-x}$Ce$\text{}_{x}$CuO$\text{}_{4-y}$ ab-plane in air under the conditions of sample bias voltage V$\text{}_{t}$=500 mV and set current I$\text{}_{s}$=0.3 nA. It is possible to prepare atomically flat and clean surfaces as well as to create new structures in a nanometer scale in these electron-doped materials. The similar processes were not observed during atomic force microscopy imaging.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 1; 209-214
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase Relations in Gd$\text{}_{2}$O$\text{}_{3}$-CeO$\text{}_{2}$-CuO System at 980°C. Part I
    Autorzy:
    Horyń, R.
    Sikora, A.
    Bukowska, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041467.pdf
    Data publikacji:
    2004-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.75.+g
    81.40.Rs
    75.50.-y
    72.20.My
    Opis:
    Phase equilibria in Gd$\text{}_{2}$O$\text{}_{3}$-CeO$\text{}_{2}$-CuO system were studied based on samples obtained from appropriate mixtures of the starting components, prepared by a conventional solid state reaction in air. The phase relations prevalent in this system have been deduced based on X-ray diffraction of well-equilibrated samples. An isothermal cross-section diagram through the system at 980°C is presented and chemical constitution of the Ce-doped Gd$\text{}_{2}$CuO$\text{}_{4}$ phase is proposed.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 5; 727-731
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Specific Fuel Consumption and Exhaust Emissions of Four Stroke Diesel Engine with CuO/Water Nanofluid as Coolant
    Autorzy:
    Senthilraja, S.
    Vijayakumar, K. C. K.
    Gangadevi, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/140023.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanofluid
    engine performance
    exhaust emissions
    nanopłyn
    wydajność silnika
    emisja spalin
    Opis:
    This article reports the effects of CuO/water based coolant on specific fuel consumption and exhaust emissions of four stroke single cylinder diesel engine. The CuO nanoparticles of 27 nm were used to prepare the nanofluid-based engine coolant. Three different volume concentrations (i.e 0.05%, 0.1%, and 0.2%) of CuO/water nanofluids were prepared by using two-step method. The purpose of this study is to investigate the exhaust emissions (NOx), exhaust gas temperature and specific fuel consumption under different load conditions with CuO/water nanofluid. After a series of experiments, it was observed that the CuO/water nanofluids, even at low volume concentrations, have a significant influence on exhaust emissions. The experimental results revealed that, at full load condition, the specific fuel consumption was reduced by 8.6%, 15.1% and 21.1% for the addition of 0.05%, 0.1% and 0.2% CuO nanoparticles with water, respectively. Also, the emission tests were concluded that 881 ppm, 853 ppm and 833 ppm of NOx emissions were observed at high load with 0.05%, 0.1% and 0.2% volume concentrations of CuO/water nanofluids, respectively.
    Źródło:
    Archive of Mechanical Engineering; 2017, LXIV, 1; 111-121
    0004-0738
    Pojawia się w:
    Archive of Mechanical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some Electronic Properties of Sr$\text{}_{1-x}$A$\text{}_{x}$CuO$\text{}_{2+δ}$ where A=La, K, and Ca
    Autorzy:
    Onyszkiewicz, I.
    Czarnecki, P.
    Poltoracky, Yu. B.
    Zimpel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929860.pdf
    Data publikacji:
    1994-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.30.+h
    72.15.-v
    76.30.Fc
    Opis:
    The electronic properties of Sr$\text{}_{1-x}$A$\text{}_{x}$CuO$\text{}_{2+δ}$ (A = La, K, Ca) were examined. The crystal structure of the synthesized compounds was identified as orthorhombic with some admixture of tetragonal phase. For Sr$\text{}_{1-x}$La$\text{}_{x}$CuO$\text{}_{2+δ}$ the insulator-metal like transition was observed with increasing La content. The d$\text{}_{x²-y²}$ ground state of Cu ions was deduced from electron spin resonance measurements. The electronic state of Cu ions and their surrounding local symmetry was also found to be La and oxygen content dependent.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 2; 303-306
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Negative Magnetoresistance in the Variable-Range-Hopping Transport of Strongly Underdoped La$\text{}_{2-x}$Sr$\text{}_{x}$CuO$\text{}_{4}$
    Autorzy:
    Malinowski, A.
    Cieplak, M. Z.
    Berkowski, M.
    Guha, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046779.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.-h
    74.25.Fy
    73.43.Qt
    Opis:
    The in-plane transport of strongly underdoped La$\text{}_{2-x}$Sr$\text{}_{x}$CuO$\text{}_{4}$ films was examined in the magnetic fields up to 14 T and in temperatures down to 1.6 K. While at high temperatures the samples display metallic-like resistivity, the low-T transport is governed by variable-range-hopping mechanism. Careful analysis shows that the temperature dependence of pre-exponential factor in Mott's variable-range-hopping law may not be neglected and that the density of states at the Fermi level can be effectively expressed as g(E-E$\text{}_{F}$)=N$\text{}_{0}$ (E-E$\text{}_{F}$)$\text{}^{p}$, with a small exponent p of the order of 0.1. In the magnetic field parallel to CuO$\text{}_{2}$ planes one of the variable-range-hopping parameter,ρ$\text{}_{0}$, increases by about 20-25%, while the other one, T$\text{}_{0}$, decreases by about 10-15%, resulting in the decrease in total resistivity. This effect may be related to the decrease of the tunneling barrier between different antiferromagnetic clusters in the presence of magnetic field.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 611-615
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Explanations of the Optical Band Positions and Local Structure for $Cu^{2+}$ Centers in $ZnO-Bi_{2}O_{3}-B_{2}O_{3}-CuO$ Glasses
    Autorzy:
    Yuan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1377767.pdf
    Data publikacji:
    2014-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Bb
    75.10.Dg
    76.30.-v
    76.30.Fc
    Opis:
    The local structure, two optical band positions and three electronic spin resonance parameters for $Cu^{2+}$ centers at the tetragonally-distorted octahedral sites in $ZnO-Bi_2O_3-B_2O_3-CuO$ glasses are calculated from the high-order perturbation method based on the two-spin-orbit-parameter model, where the contributions from both the spin-orbit coupling parameters of central $d^{n}$ ion and ligand ion are included. The theoretical results are in good agreement with the experimental values. The calculations show that the high-order perturbation method based on the two-spin-orbit-parameter model is effective in the explanations of optical spectra, electronic spin resonance parameters and local distortion structure for $d^{9}$ ions in glasses.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 6; 1293-1295
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Epitaxially Induced Defects in Sr- and O-doped La$\text{}_{2}$CuO$\text{}_{4}$ Thin Films Grown by MBE: Implications for Transport Properties
    Autorzy:
    Locquet, J.-P
    Williams, E. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1964235.pdf
    Data publikacji:
    1997-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Nn
    74.62.Fj
    81.15.Hi
    74.72.Dn
    Opis:
    In this paper, the critical role played by various types of defects and strain relaxation mechanisms in high-T$\text{}_{c}$ thin films is highlighted and illustrated with examples. The defects are essential for providing adequate diffusion channels for oxygen ingress during the cooling step in c-axis thin films. The operation of strain relaxation mechanisms necessitated by the lattice mismatch between film and substrate can impose a compressive or tensile biaxial pressure, which either increases or reduces the critical temperature.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 1; 69-84
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CuO–water mhd mixed convection analysis and entropy generation minimization in double-lid–driven u-shaped enclosure with discrete heating
    Autorzy:
    Mliki, Bouchmel
    Miri, Rached
    Djebali, Ridha
    Abbassi, Mohamed A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2204647.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    U-shaped enclosure
    MHD mixed convection
    nanoliquids
    double lid-driven cavity
    entropy generation
    LBM
    Opis:
    The present study explores magnetic nanoliquid mixed convection in a double lid–driven U-shaped enclosure with discrete heat-ing using the lattice Boltzmann method (LBM) numerical method. The nanoliquid thermal conductivity and viscosity are calculated using the Maxwell and Brinkman models respectively. Nanoliquid magnetohydrodynamics (MHD) and mixed convection are analyzed and entropy generation minimisation has been studied. The presented results for isotherms, stream isolines and entropy generation describe the interaction between the various physical phenomena inherent to the problem including the buoyancy, magnetic and shear forces. The operating parameters’ ranges are: Reynolds number (Re: 1–100), Hartman number (Ha: 0–80), magnetic field inclination (γ: 0°–90°), nanoparticles volume fraction (ϕ: 0–0.04) and inclination angle (α: 0°–90°). It was found that the and the total entropy generation augment by increasing Re, ϕ: and γ. conversely, an opposite effect was obtained by increasing Ha and α. The optimum magnetic field and cavity inclination angles to maximum heat transfer are γ = 90° and α = 0.
    Źródło:
    Acta Mechanica et Automatica; 2023, 17, 1; 112--123
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Anharmonicity and Weak Mode Assignment in La$\text{}_{2-x}$Sr$\text{}_{x}$CuO$\text{}_{4}$, with Oxygen Isotopic Substitution
    Autorzy:
    Siranidi, E.
    Lampakis, D.
    Palles, D.
    Liarokapis, E.
    Conder, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047249.pdf
    Data publikacji:
    2007-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.30.-j
    31.30.Gs
    74.25.Kc
    74.72.Dn
    Opis:
    The oxygen isotope effect on the first- and second-order Raman active modes of high-quality La$\text{}_{2-x}$Sr$\text{}_{x}$Cu$\text{}^{16,18}$O$\text{}_{4}$ (80% substitution $\text{}^{16}$O by $\text{}^{18}$O) polycrystalline compounds with x=0.00, 0.015 was investigated at low temperatures. In the second-order Raman scattering several weak and strong peaks were observed and assigned to oxygen atom vibrations. With the isotopic substitution the apex oxygen mode follows quite well the mass harmonic law at all temperatures studied, while the soft mode is anharmonic in the temperature range of 77-180 K and for higher temperatures its anharmonicity is strongly increased. The temperature dependence of the energy of the soft mode for x=0.0 shows also a modification at≈180 K and an abnormal behaviour at≈280 K, which may be related with the transition to the antiferromagnetic phase.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 1; 173-177
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Nature of a Ni Dopant in $La_{1.85}Sr_{0.15}CuO_4$: Spin-Glass Behavior
    Autorzy:
    Malinowski, A.
    Bezusyy, V.
    Minikayev, R.
    Paszkowicz, W.
    Dziawa, P.
    Syryanyy, Y.
    Sawicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1536592.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.62.Dh
    75.40.Cx
    75.40.Gb
    75.50.Lk
    Opis:
    The magnetic properties of $La_{1.85}Sr_{0.15}CuO_4$ doped with Ni was investigated in the field up to 5 T and in the temperature range from 2 K to 400 K using both dc and ac techniques. For Ni content larger than 0.05 the system exhibits irreversibility of low-field susceptibility χ(T) below a certain temperature depending on y and a cusp at $T_{g}$ in χ(T) measured after zero-field cooling. The decay of remnant magnetization below $T_{g}$ with time is described by a stretched-exponential function. In accordance with scaling theory, all the χ(T) data for y = 0.50 sample taken in the vicinity of $T_{g}$ at different fields collapse onto two separate curves when plotted as $q|t|^{-β}$ vs. B$^2 |t|^{-β - γ}$, where q is the spin-glass order parameter, t = (T - $T_{g}$)/$T_{g}$, and β and γ are the critical exponents. All these features taken together reveal existence of spin-glass phase below $T_{g}$. Variation of $T_{g}$ with y is linear below y = 0.25 and $T_{g}$ extrapolates to 0 K for y → 0 what strongly suggests that spin-glass phase extends into superconducting region of the phase diagram.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 244-248
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Spin-Ladders (A$\text{}_{2}$Cu$\text{}_{2}$O$\text{}_{3}$)$\text{}_{m}$ (CuO$\text{}_{2}$)$\text{}_{n}$
    Autorzy:
    Baran, M.
    Szymczak, H.
    Szymczak, R.
    Dyeyev, S.
    Leonyuk, L.
    Babonas, G.-J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2013220.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.40.Cx
    75.30.Gw
    75.45.+j
    75.90.+w
    Opis:
    Magnetization M(T) and M(H) data of single crystals of the S=1/2 quasi-one-dimensional system (A$\text{}_{2}$Cu$\text{}_{2}$O$\text{}_{3}$)$\text{}_{m}$(CuO$\text{}_{2}$)$\text{}_{n}$ with various A-site constituents are compared. The studied orthorhombic, incommensurate crystals are characterized by m/n=5/7,7/10, and 9/13. The role of rare-earth ions located in A-sites is discussed.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 571-574
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and Characterization of CuO Nanoparticles by the Chemical Liquid Deposition Method and Investigation of Its Catalytic Effect on the Thermal Decomposition of Ammonium Perchlorate
    Autorzy:
    Eslami, A.
    Juibari, N. M.
    Hosseini, S. G.
    Abbasi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/358128.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    copper oxide nanoparticles
    ex-situ growth
    ammonium perchlorate
    thermal decomposition
    chemical liquid deposition
    Opis:
    Copper oxide nanoparticles have been synthesized by the chemical liquid deposition method and characterized by means of X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The XRD and SEM results showed that the particle size was between 50 nm and 70 nm. Ammonium perchlorate (AP)-CuO nanostructures have been prepared by ex-situ mixing of AP and CuO nanoparticles, while AP/CuO nanocomposites have been obtained by in-situ growth of nano CuO on the surface of AP. The effect of the nanoparticles on the thermal decomposition of AP has been examined by differential scanning calorimetery (DSC) and thermogravimetric analysis (TGA) methods. The results showed that the ex-situ prepared nanoparticles had better catalytic activity than the in-situ prepared ones. The effect of the synthesized nanoparticles on the thermal decomposition of AP in experiments with a AP to CuO ratio of 98:2 was as follows: with the ex-situ prepared experiments, the decomposition temperature decreased from 428 °C to 348 °C and the heat released increased from 344 J·g−1 to 1432 J·g−1, while those with the in-situ prepared samples exhibited 341 °C and 1317 J·g−1, respectively.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 1; 152-168
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EPR Study of Water Induced Decomposition of the SrCuO$\text{}_{2}$ and Sr$\text{}_{2}$CuO$\text{}_{3}$ Ceramics Surface. The Role of Carbon Dioxide
    Autorzy:
    Augustyniak-Jabłokow, M. A.
    Yablokov, Yu. V.
    Jacyna-Onyszkiewicz, I.
    Ivanova, T. A.
    Shustov, V. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047737.pdf
    Data publikacji:
    2007-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ee
    76.30.Fc
    81.05.Je
    Opis:
    Processes of SrCuO$\text{}_{2}$ and Sr$\text{}_{2}$CuO$\text{}_{3}$ ceramics decomposition induced by contact with water and carbon dioxide were studied by EPR. The dominant signals in the spectra were found to originate from Sr$\text{}_{2}$Cu(OH)$\text{}_{6}$ (for Sr$\text{}_{2}$CuO$\text{}_{3}$) and SrCu(OH)$\text{}_{4}$·H$\text{}_{2}$O (for SrCuO$\text{}_{2}$) compounds. The thermally induced conversion of SrCu(OH)$\text{}_{4}$·H$\text{}_{2}$O into Sr$\text{}_{2}$Cu(OH)$\text{}_{6}$ was analysed, and its product CuO was found to exist in the nanocrystalline form. The presence of CO$\text{}_{2}$, reacting with Sr(OH)$\text{}_{2}$, was shown to modify the decomposition process leading to the appearance of SrCu(OH)$\text{}_{4}$·H$\text{}_{2}$O, some hydroxycarbonates and Cu(OH)$\text{}_{2}$ on the surface of ceramics studied. At temperatures higher than 300ºC CuO reacts back with Sr(OH)$\text{}_{2}$. For the samples being in contact with atmospheric moisture this compound, deposited on a surface of SrCuO$\text{}_{2}$, decomposes to Sr$\text{}_{2}$Cu(OH)$\text{}_{6}$. The presence of the antiferromagnetic compounds Cu(OH)$\text{}_{2}$, CuO, and Cu$\text{}_{2}$[(OH)$\text{}_{2}$CO$\text{}_{3}$] in the samples can influence the results of magnetic measurements of the studied ceramics.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 3; 525-536
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of ZnO, CuO, Au, and TiO2 nanoparticles on Daphnia magna and early life stages of zebrafish danio rerio
    Autorzy:
    Liu, J.
    Fan, D.
    Wang, L.
    Shi, L.
    Ding, J.
    Chen, Y.
    Shen, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/207169.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    metal oxides
    titanium dioxide
    nanoparticles
    toxicity
    zinc oxide
    Daphnia magna
    nanocząsteczki
    tlenki metali
    dwutlenek tytanu
    toksyczność
    tlenek cynku
    rozwielitki
    Opis:
    The effects of four different kinds of nanoparticles (NPs), namely, CuO, ZnO, TiO2, and Au, of the sizes ranging from <20 nm to 50 nm on Daphnia magna, early life stage of zebrafish, and various enzymes have been investigated. The experimental results showed that the NPs inhibited both the body length and hatching rate of zebrafish larvae; the small nanoparticles exhibited more toxicity. In a 21 day chronic toxicity test, metal ions of higher concentrations significantly reduced the number of Daphnia magna offspring. Studies on enzyme activity showed that the NPs reduced the glutathione content and inhibited catalase and superoxide dismutase activities, resulting in shorter body length, lower hatching success, and lower reproduction of zebrafish larvae. Therefore, studies should focus more on the potential toxicity of smaller NPs.
    Źródło:
    Environment Protection Engineering; 2014, 40, 1; 139-149
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strain Relaxation in Thin Films of La$\text{}_{1.85}$Sr$\text{}_{0.15}$CuO$\text{}_{4}$ Grown by Pulsed Laser Deposition
    Autorzy:
    Zaytseva, I.
    Cieplak, M. Z.
    Abal'oshev, A.
    Berkowski, M.
    Domukhovski, V.
    Paszkowicz, W.
    Shalimov, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047252.pdf
    Data publikacji:
    2007-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.-a
    74.62.-c
    74.72.Dn
    74.78.Bz
    74.25.Fy
    Opis:
    X-ray diffraction, resistivity, and susceptibility measurements are used to examine the effects of film thickness d (from 17 to 250 nm) on the structural and superconducting properties of La$\text{}_{1.85}$Sr$\text{}_{0.15}$CuO$\text{}_{4}$ films grown by pulsed laser deposition on SrLaAlO$\text{}_{4}$ substrates. For each d the film sgrow with a variable strain, ranging from a large compressive strain in the thinnest films to a negligible or tensile strain in thick films. Our results indicate that the tensile strain is not caused by the off-stoichiometric layer at the substrate-film interface. Instead, it may be caused by the extreme oxygen deficiency in some of the films.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 1; 185-188
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    In situ thermal decomposition route: Preparation and characterization of nano nickel, cobalt, and copper oxides using an aromatic amine complexes as a low-cost simple precursor
    Autorzy:
    Refat, Moamen S.
    Mohamed, Soha F.
    Altalhi, Tariq A.
    Bakare, Safyah B.
    Al-Hazmi, Ghaferah H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1849310.pdf
    Data publikacji:
    2021
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    o-tolidine
    NiO
    Co3O4
    CuO
    XRD
    TEM
    nanoparticles
    complexation
    Opis:
    The main interest now is the development of metallic or inorganic-organic compounds to prepare nanoparticle materials. The use of new compounds could be beneficial and open a new method for preparing nanomaterials to control the size, shape, and size of the nanocrystals. In this article, the thermal decomposition of [M2(o-tol)2(H2O)8]Cl4 (where o-tol is ortho-tolidine compound, M = Ni2+, Co2+, Cu2+) new precursor complex was discussed in solid-state conditions. The thermal decomposition route showed that the synthesized three complexes were easily decomposed into NiO, Co3O4 and CuO nanoparticles. This decomposition was performed at low temperatures (~600°C) in atmospheric air without using any expensive and toxic solvent or complicated equipment. The obtained product was identified by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDX). FT-IR, XRD and EDX analyses revealed that the NiO nanoparticles exhibit a face-centered-cubic lattice structure with a crystallite size of 9–12 nm. The formation of a highly pure spinel-type Co3O4 phase with cubic structure showed that the Co3O4 nanoparticles have a sphere-like morphology with an average size of 8–10 nm. The XRD patterns of the CuO confirmed that the monoclinic phase with the average diameter of the spherical nanoparticles was approximately 9–15 nm.
    Źródło:
    Polish Journal of Chemical Technology; 2021, 23, 2; 47-53
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    From Cuprate to Nickelate: Evolution of the Normal State Properties with Ni from $La_{1.85}Sr_{0.15}CuO_4$ to $La_{1.85}Sr_{0.15}NiO_4$
    Autorzy:
    Bezusyy, V.
    Malinowski, A.
    Minikayev, R.
    Paszkowicz, W.
    Dziawa, P.
    Gorzelniak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537207.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Ha
    74.72.-h
    74.72.Kf
    75.30.-m
    Opis:
    The influence of Ni doping on the normal-state pseudogap in $La_{1.85}Sr_{0.15}CuO_4$ is studied by dc magnetic susceptibility measurements, accompanied by X-ray powder diffraction analysis and resistivity measurements. The measurements are carried out on the polycrystalline $La_{1.85}Sr_{0.15}Cu_{1-y}Ni_yO_4$ samples in the whole doping range from y=0.01 up to y=1. The temperature of pseudogap opening is found to decrease above y=0.05 and to vanish when y exceeds 0.07. At small Ni content, up to y=0.07, the magnetic moment induced by Ni is constant and equal to 0.7 $μ_{B}$ per Ni, while for larger y it increases abruptly and reaches about 1.6 $μ_{B}$ per Ni ion for y = 0.5. The dependence of the normal-state resistivity on temperature evolves smoothly from the metallic-like for small y, to the variable range hopping, described by the Mott law with the exponent 1/4, for samples with y>0.15.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 402-405
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Physical Properties of (M$\text{}_{2}$Cu$\text{}_{2}$O$\text{}_{3}$)$\text{}_{m}$(CuO$\text{}_{2}$)$\text{}_{n}$ (M = Ca, Sr, Bi) Single Crystals with Bi-2212 Phase on their Surface
    Autorzy:
    Babonas, G.-J.
    Leonyuk, L.
    Maltsev, V.
    Szymczak, R.
    Reza, A.
    Baran, M.
    Dapkus, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028903.pdf
    Data publikacji:
    2001-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.66.-w
    74.72.Jt
    74.76.Bz
    Opis:
    The structural, optical, and magnetic properties are studied in the (M$\text{}_{2}$Cu$\text{}_{2}$O$\text{}_{3}$)$\text{}_{m}$(CuO$\text{}_{2}$)$\text{}_{n}$-type single crystals with the surface on which the Bi-2212-type phase was indicated. The physical properties of such samples were interpreted to some extent by the contributions of two phases. When the secondary phases on the surface of the samples were removed by mechanical polishing or etching by Ar$\text{}^{+}$-ion plasma, the physical properties were typical of the (M$\text{}_{2}$Cu$\text{}_{2}$O$\text{}_{3}$)$\text{}_{m}$(CuO$\text{}_{2}$)$\text{}_{n}$-type crystals. The optical method was shown to be effective for indication of secondary Bi-rich phases on the surface of (M$\text{}_{2}$Cu$\text{}_{2}$O$\text{}_{3}$)$\text{}_{m}$(CuO$\text{}_{2}$)$\text{}_{n}$ samples.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 4; 553-563
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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