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Wyszukujesz frazę "copper oxide" wg kryterium: Temat

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Some Physical Properties of Copper Oxide Thin Films Prepared by Electrolysis Method
    Autorzy:
    Oudah, Mustafa H.
    Mazin, H. Hasan
    Abd, Ahmed N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065248.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    copper oxide
    drop-casting method
    electrolysis
    quantum size effect
    thin films
    Opis:
    The aim of this paper is to study the properties of copper oxide thin films prepared by electrolysis method and deposited on glass substrates by drop-casting method at different annealing temperatures. Copper oxide colloidal was successfully prepared by electrolysis method. The X-ray diffraction confirms the polycrystalline structure of the films. Atomic force microscopy shows that the increase in the annealing temperature improves the surface morphology, increases the grain size and removes the cracks. The best optical transmittance was for the film annealed at 200 ºC. The bandgap decreases from 3.35 eV to 3.15 eV as a result of increasing the annealing temperature. The wide bandgap that obtained in this study is due to quantum size effect.
    Źródło:
    World Scientific News; 2019, 135; 59-70
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Copper (II) Oxide particles as Adsorbent for Removal of Alkali Blue; Isotherm and Kinetic Studies
    Autorzy:
    Ibrahim, M. A.
    Ibrahim, M. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1158766.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Adsorption
    Copper (II) Oxide particles
    FTIR
    Isotherm
    Kinetics
    Opis:
    Adsorption behaviour of copper (II) oxide particles (CuO-Ps) for the removal of Alkali Blue (AB) was studied. Different adsorption variables such as contact time, initial concentration and pH for the adsorption process were investigated by batch adsorption studies. FTIR was carried out to determine the functional groups present at the surface of the particle with functional groups such as –OH, C=C, C-H, C≡C detected. The percentage removal and optimum contact time for the removal of AB was 84.8% at 10 min. The experimental isotherms data were analyzed using Langmuir, Temkin, Freundlich and Dubinin-Radushkevich (D-R) isotherms and it was observed that AB fits closely to Langmuir with R2 value of 0.884. Kinetics studies shows that the adsorption process fits better to pseudo-second order with the experimental values of qe 4.242 been closer to the calculated values of the qe 4.108. Effect of pH shows that it adsorb better at the initial pH of 5.30. Lower value of mean square energy of 0.707 kJ/mol indicates that the adsorption process is physical. The results indicated that copper (II) oxide particle can be used as a low-cost adsorbent for the removal of AB from aqueous solutions.
    Źródło:
    World Scientific News; 2018, 114; 208-217
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antiviral Activities of Cu2+ Ions in Viral Prevention, Replication, RNA Degradation, and for Antiviral Efficacies of Lytic Virus, ROS-Mediated Virus, Copper Chelation
    Autorzy:
    Ishida, Tsuneo
    Powiązania:
    https://bibliotekanauki.pl/articles/1177808.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Capsid protein
    Copper chelation
    Copper homeostasis
    Copper oxide nanoparticles
    Cu2+ and Cu1+ ions
    DNA/RNA virus
    HSV
    ROS
    Viral replication
    mRNA degradation or decay
    Opis:
    Copper has been known for decades that marked changes of micronutrient homeostasis in the host are accompanied by infection or inflammation. Copper levels in the serum are significantly elevated in response to inflammation that copper accumulates at sites of inflammation. Easily oxidized copper oxide nanoparticles (CuONPs) are widely used as catalysts that the ability of CuONPs to reduce bacterial population and virus application is enhanced. The mechanism of copper-mediated inactivation of herpes simplex virus (HSV) is by which cupric ions oxidatively damage biomolecules. Virus-mediated subjugation and modulation of host lipids during infection that the life cycle of most viruses proceeds through a series of basic steps: binding and internalization, fusion, uncoating, of the viral genome, its replication, assembly of new particles, and budding or release of the newly made viruses. The HIV-1 protein Vpu is an 81-amino-acid (16-kDa) type I which the presence of Vpu leads to the degradation of BST-2 via an endosome-lysosome degradation pathway. Oxidative degradation by a Cu-metalloenzyme, and ubiquitin-mediated degradation of cellular proteins were exploited. Copper can disrupt the lytic cycle of the Coccolithovirus. Lysins represent a novel class of anti-infectives derived from bacteriophage which lysins are bacterial cell wall hydrolytic enzymes that selectively and rapidly kill specific bacteria. Regarding copper induced cellular toxicity, several mechanisms have been proposed based on the formations of ROS by free Cu ions as cupric and cuprous ions can participate in redox reactions. ROS (O2ˉ,･OH, OHˉ), Cu+ and H2O2 play the important roles for viral inactivations. Thujaplicin-copper chelates inhibit influenza virus-induced apoptosis. Pyrrolidine dithiocarbamate as a metal ion binding agent inhibits the activity of the viral proteases of polyprotein processing and RNA replication of HRV. Chelation enables metals are capable of ligand scavenging via complexation, since reverse transcriptase enzyme inhibits the growth and replication of RNA tumor viruses. Thus, copper complex and copper chelation enhance antiviral efficacy.
    Źródło:
    World Scientific News; 2018, 99; 148-168
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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