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Wyświetlanie 1-15 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
Wyświetlanie 1-15 z 44

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