Articoli di riviste: "COPPER OXIDE NANOPARTICLE"

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Saif Hasan, Syed, Sanjay Singh, Rasesh Y. Parikh, Mahesh S. Dharne, Milind S. Patole, B. L. V. Prasad e Yogesh S. Shouche. "Bacterial Synthesis of Copper/Copper Oxide Nanoparticles". Journal of Nanoscience and Nanotechnology 8, n. 6 (1 giugno 2008): 3191–96. http://dx.doi.org/10.1166/jnn.2008.095.

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A bacterial mediated synthesis of copper/copper oxide nanoparticle composite is reported. A Gram-negative bacterium belonging to the genus Serratia was isolated from the midgut of Stibara sp., an insect of the Cerambycidae family of beetles found in the Northwestern Ghats of India. This is a unique bacterium that is quite specific for the synthesis of copper oxide nanoparticles as several other strains isolated from the same insect and common Indian mosquitoes did not result in nanoparticle formation. By following the reaction systematically, we could delineate that the nanoparticle formation occurs intracellularly. However, the process results in the killing of bacterial cells. Subsequently the nanoparticles leak out as the cell wall disintegrates. The nanoparticles formed are thoroughly characterized by UV-Vis, TEM, XRD, XPS and FTIR studies.

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Liang, Septimus H., Shiliang Wang e David B. Pedersen. "Adsorption of HCN onto Copper@Copper-Oxide Core–Shell Nanoparticle Systems". Adsorption Science & Technology 27, n. 4 (maggio 2009): 349–61. http://dx.doi.org/10.1260/026361709790252632.

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Copper compounds are widely used as impregnants that enhance the removal of HCN by carbon-based filter media. The reaction mechanism involved is poorly understood. In this study, we have followed the reaction of HCN with pristine copper, copper oxide (CuO and Cu2O) and copper@copperoxide (Cu@Cu2O) core–shell nanoparticles of well-defined size and composition. We have established a cooperative reaction mechanism where both the copper oxide shell and copper core are required for the chemisorption of HCN onto copper nanoparticle impregnants. The suitability of copper@copperoxide nanoparticles as impregnants for the removal of HCN in respirator canisters is discussed.

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Hanisha R, Hanisha R., Udayakumar R. Udayakumar R, Selvayogesh S. Selvayogesh S, Keerthivasan P. Keerthivasan P e Gnanasekaran R. Gnanasekaran R. "Anti Fungal Activity of Green Synthesized Copper Nanoparticles Using Plant Extract of Bryophyllum Pinnatum (Lam.) and Polyalthia Longifolia (Sonn.) R". Biosciences Biotechnology Research Asia 20, n. 1 (30 marzo 2023): 317–28. http://dx.doi.org/10.13005/bbra/3091.

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Plant-mediated nano-fabrication is a new area of nanotechnology that is preferred to traditional methods due to its advantages in terms of safety, cost efficiency, environmental friendliness, and biocompatibility. In the current study, copper chloride and copper sulphate are used as precursor materials to examine the effectiveness of green synthesized copper oxide nanoparticles using the plants Bryophyllum pinnatum (lam.) and Polyalthia longifolia (Sonn.) . Comparative study on the efficiency of the synthesized Copper oxide nanoparticles against each precursor has been studied. Different spectroscopic and microscopic characterization techniques such as UV- Visible spectrophotometer, X- ray powder diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), Scanning Electron Microscope (SEM) were performed to confirm the presence of copper oxide nanoparticles. UV –vis spectrophotometer results confirmed the existence of copper oxide nanoparticles using Copper chloride and Copper sulphate precursor showed absorption at 235nm and 575nm respectively. X- Ray Diffraction results showed crystalline structure of the particles with three peaks at (111), (200) & (220) which confirmed the presence of copper oxide nanoparticle for both the precursors. FTIR results supported the existence of several functional groups involved in capping, reducing, and stabilizing copper oxide nanoparticles. The SEM image showed that the copper oxide nanoparticles were spherical in shape and ranged in size from 40 to 90 nm. Further, the Anti-fungal and Anti-bacterial activity of the synthesized nanoparticle for both the copper chloride and copper sulphate precursor were studied. The Study shown maximum zone of inhibition at 100µg/ml as 18mm and 25mm respectively against Galactomyces geotrichum. As a result of the high biological potentials and powerful Antifungal activity, the green synthesized copper oxide nanoparticles can be exploited in phytopathology to combat plant infections.

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Lakshmi, Augustine, Athisayaraj Emi Princess Prasanna e Chinnapiyan Vedhi. "Synthesis, Characterisation and Capacitive Behaviour of Poly(3,4-ethylenedioxythiophene)-Copper Oxide Nanocomposites". Advanced Materials Research 678 (marzo 2013): 273–77. http://dx.doi.org/10.4028/www.scientific.net/amr.678.273.

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Nano particles of Copper oxide and Poly(3,4-ethylenedioxythiophene)-Copper oxide nanocomposite were prepared by chemical oxidation method. The formed metal oxide nanoparticle and polymer metal oxide nanocomposites were characterized by UV–VIS, XRD, SEM and EIS studies. The UV-VIS studies of nanoparticles and nanocomposites exhibited four peaks, two peaks are sharp and centered at 280nm and 360 nm while the other two were broaden waves obtained at 780nm and 985nm. SEM image of copper oxide nanoparticles and nanocomposite exhibits sponge-like morphologies, in addition to nanospheres, nanowires, and nanotube shapes. The grain size of the metal oxide nanoparticle and polymer metaloxide nanocomposites was calculated using Scherrer’s formula. Electrochemical impedance spectroscopy (EIS) studies revealed the high conductivity nature due to the increased surface area of the nanocomposites.

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Dyah Rifani, Nabila, Rebriarina Hapsari, Tyas Prihatiningsih e Ali Khumaeni. "Synthesis, characterization, and antimicrobial properties of copper oxide nanoparticles produced by laser ablation method in chitosan solution". Journal of Applied Research and Technology, n. 2 (27 aprile 2023): 196–204. http://dx.doi.org/10.22201/icat.24486736e.2023.21.2.1596.

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Copper Oxide Nanoparticles (CuONPs) show a broad spectrum of antimicrobial activity against various species of microorganisms, including gram-positive and gram-negative fungi and bacteria, but in general gram-negative bacteria are more resistant to the effects of copper nanoparticle ions than gram-positive ones. In this work, synthesis of copper oxide nanoparticles has been carried out using laser ablation methods and the nanoparticles were applied as antibacterial agent against gram-positive bacteria Enterococcus faecalis. Experimentally, Nanoparticle synthesis was carried out using laser ablation with a power of 40 mJ. Antibacterial test with disc diffusion test using disc paper soaked in 0.1% chitosan solution (negative control), sodium hypochlorite (positive control), and copper oxide nanoparticles with a concentration of 60 ppm, 80 ppm, 100 ppm; then put into a petri dish that has been planted with the Enterococcus faecalis bacteria. Copper oxide nanoparticles were formed in chitosan as confirmed by UV-Vis, FTIR, SEM and EDX analysis. Post Hoc Tukey HSD analysis showed a significant difference in the negative control group, and the inhibition zone diameter of the treatment group was the same. The synthesis of nanoparticles using laser ablation fired at a pure copper plate succeeded in producing copper oxide nanoparticles in chitosan solvent. The firing time affects the concentration and size of the nanoparticles. More laser energy is required to produce a smaller particle size due to its antibacterial activity.

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Mohamed, HudaElslam, Unal Camdali, Atilla Biyikoglu e Metin Aktas. "Enhancing the Performance of a Vapour Compression Refrigerator System Using R134a with a CuO/CeO2 Nano-refrigerant". Strojniški vestnik - Journal of Mechanical Engineering 68, n. 6 (22 giugno 2022): 395–410. http://dx.doi.org/10.5545/sv-jme.2021.7454.

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Most studies report that dispersing nanoparticles into refrigerants and lubricating oils leads to performance improvements in refrigeration systems, due to improvements in the thermal physics properties of a pure refrigerant, which leads to reduced energy consumption. Using nanoparticles in a refrigeration system is associated with many difficulties, such as the cost of preparing and obtaining a stable and homogeneous mixture with less agglomeration and sedimentation. Most current studies focus on the use of metals, metal oxides, and a hybrid of oxides as nanoparticles in refrigeration systems. In this research, nanoparticles were prepared in an inexpensive and easy way as a single oxide and as a mixture consisting of copper and cerium oxides. The results of nanoparticle preparation using X-ray diffraction and scanning electron microscopy prove that the particles of the samples were spherical in shape, with suitable average diameters ranging from 78.95 nm, 79.9 nm, 44.15 nm and 63.3 nm for copper oxide, cerium oxide, the first mixture, and the second mixture, respectively. Cerium oxide has not been used in a refrigeration system; this study preferred the implementation of a theoretical study using Ansys Fluent software to verify the possibility of improving the performance of the refrigeration system. The results confirmed that copper oxide enhanced the coefficient of performance of the refrigeration system by 25 %, and cerium oxide succeeded in improving the performance of the. system by a lesser value. The mixture containing a higher percentage of copper oxide yielded better results.

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Samuel Paul, Akintunde Sheyi, Iliya Daniel Bangu, Sani Idris Abubakar e Muawiyya Muazu Muhammad. "Biological synthesis and characterization of copper oxide nanoparticles using aqueous Psidium guajava leave extract and study of antibacterial activity of the copper oxide nanoparticles on Escherichia coli and Staphylococcus aureus". World Journal of Advanced Research and Reviews 9, n. 1 (30 gennaio 2021): 114–20. http://dx.doi.org/10.30574/wjarr.2021.9.1.0513.

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Nanobiotechnogy has been developed to synthesized copper oxide nanoparticle. This was carried out biologically using leaf extract of Psidium guajava as a reducing and stabilizing agent. Optical property showed a color change from dark brown to gold- yellow after the addition of leaf extract. The possible functional group in the plant extract responsible for the reduction of CuONps was identified as belonging to alkyl halide group by FT-IR analysis. UV- visible spectra of copper oxide nanoparticle showed a surface plasmon resonance peak at 390nm. The biologically synthesized copper nanoparticles were tested for antibacterial activity against two human pathogens viz, Escherichia coli and Staphylococcus aureus. Biosynthesized copper nanoparticle showed clear zone of inhibition or better activity against Escherichia coli and Staphylococcus aureus.

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Cui, Wen Ying, Hyun Jin Yoo, Yun Guang Li, Changyoon Baek e Junhong Min. "Electrospun Nanofibers Embedded with Copper Oxide Nanoparticles to Improve Antiviral Function". Journal of Nanoscience and Nanotechnology 21, n. 8 (1 agosto 2021): 4174–78. http://dx.doi.org/10.1166/jnn.2021.19379.

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Many studies on anti-bacterial/antiviral surfaces have been conducted to prevent epidemic spread worldwide. Several nanoparticles such as those composed of silver and copper are known to have antiviral properties. In this study, we developed copper oxide (CuO) nanoparticle-incorporated nanofibers to inactivate or remove viruses. The CuO nanoparticle-incorporated nanofiber was fabricated with a hydrophobic polymer—polyvinylpyrrolidone (PVP)—using electrospinning, and CuO nanoparticles were exposed from the PVP polymer surface by etching the nanofiber with oxygen plasma. The fabrication conditions of electrospinning and oxygen plasma etching were investigated by scanning electron microscopy (SEM), and field emission transmission electron microscopy (FETEM)/ energy dispersive spectrometry (EDS). H1N1 virus was utilized as the target sample and quantified by RT-qPCR. The antiviral efficacy of CuO nanoparticle-incorporated nanofibers was compared against bare CuO nanoparticles. Overall, 70% of the viruses were inactivated after CuO nanoparticle-incorporated nanofibers were incubated with 102 pfu/mL of H1N1 virus solution for 4 h. This indicates that the developed CuO nanoparticle-incorporated nanofibers have noticeable antiviral efficacy. As the developed CuO nanoparticle-incorporated nanofibers exerted promising antiviral effects against H1N1 virus, it is expected to benefit global health by preventing epidemic spread.

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Saputra, Ferry, Boontida Uapipatanakul, Jiann-Shing Lee, Shih-Min Hung, Jong-Chin Huang, Yun-Chieh Pang, John Emmanuel R. Muñoz, Allan Patrick G. Macabeo, Kelvin H. C. Chen e Chung-Der Hsiao. "Co-Treatment of Copper Oxide Nanoparticle and Carbofuran Enhances Cardiotoxicity in Zebrafish Embryos". International Journal of Molecular Sciences 22, n. 15 (31 luglio 2021): 8259. http://dx.doi.org/10.3390/ijms22158259.

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The use of chemicals to boost food production increases as human consumption also increases. The insectidal, nematicidal and acaricidal chemical carbofuran (CAF), is among the highly toxic carbamate pesticide used today. Alongside, copper oxide nanoparticles (CuO) are also used as pesticides due to their broad-spectrum antimicrobial activity. The overuse of these pesticides may lead to leaching into the aquatic environments and could potentially cause adverse effects to aquatic animals. The aim of this study is to assess the effects of carbofuran and copper oxide nanoparticles into the cardiovascular system of zebrafish and unveil the mechanism behind them. We found that a combination of copper oxide nanoparticle and carbofuran increases cardiac edema in zebrafish larvae and disturbs cardiac rhythm of zebrafish. Furthermore, molecular docking data show that carbofuran inhibits acetylcholinesterase (AChE) activity in silico, thus leading to impair cardiac rhythms. Overall, our data suggest that copper oxide nanoparticle and carbofuran combinations work synergistically to enhance toxicity on the cardiovascular performance of zebrafish larvae.

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Blinov, A. V., А. А. Gvozdenko, A. B. Golik, А. А. Blinova, K. S. Slyadneva, M. A. Pirogov e D. G. Maglakelidze. "Synthesising Copper Oxide Nanoparticles and Investigating the Effect of Dispersion Medium Parameters on their Aggregate Stability". Herald of the Bauman Moscow State Technical University. Series Natural Sciences, n. 4 (103) (agosto 2022): 95–109. http://dx.doi.org/10.18698/1812-3368-2022-4-95-109.

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We developed a technique for synthesising gelatin-stabilised copper oxide nanoparticles. The method behind the synthesis was direct deposition, while the copper oxide precursors used were copper sulphate, chloride and acetate. We employed gelatin as a stabiliser. We employed X-ray diffraction analysis to study the effect that the copper-containing precursor may have on the phase composition in the samples. We found that using copper(II) chloride yields two different modifications of copper(II) hydroxychloride (atacamite and clinoatacamite), while copper(II) sulphate yields brochantite. We established that copper oxide forms only when using copper(II) acetate. Dynamic light scattering data shows that a monomodal size distribution with an average hydrodynamic radius of 61 nm characterises the copper oxide nanoparticles. Investigating the effect that active acidity of the medium may have on the aggregate stability of gelatin-stabilized copper oxide nanoparticles showed that the sample is stable in the pH range of 6.8--11.98. The paper presents the mechanism behind the effect of active acidity of a medium on stability of copper oxide nanoparticles. We investigated how the ionic strength of the solution affects the stability of copper oxide nanoparticle sol. We determined that Ca2+ ions have the greatest effect on the sample

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Merah, Abdelali, Abdenabi Abidi, Hana Merad, Noureddine Gherraf, Mostepha Iezid e Abdelghani Djahoudi. "Comparative Study of the Bacteriological Activity of Zinc Oxide and Copper Oxide Nanoparticles". Acta Scientifica Naturalis 6, n. 1 (1 marzo 2019): 63–72. http://dx.doi.org/10.2478/asn-2019-0009.

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Abstract Interest in nanomaterials, especially metal oxides, in the fight against resistant and constantly changing bacterial strains, is more and more expressed. Their very high reactivity, resulting from their large surface area, promoted them to the rank of potential successors of antibiotics. Our work consisted of the synthesis of zinc oxide (ZnO) and copper oxide (CuO) in the nanoparticle state and the study of their bactericidal effect on various Gram-negative and Gram-positive bacterial strains. The nanoparticles of metal oxides have been synthesized by sol-gel method. Qualitative analysis and characterization by UV / Visible and infrared spectrophotometry and X-ray diffraction confirmed that the synthetic products are crystalline. The application of the Scherrer equation allows to determine the size of the two metal oxides, namely: 76.94 nm for ZnO and 24.86 nm for CuO. The bactericidal effect of ZnO and CuO nanoparticles was tested on Gram-positive bacteria (Staphylococcus aureus, Staphylococcus hominis, Staphylococcus haemolyticus, Enterococcus facials) and Gram-negative bacteria (Escherichia coli, Schigella, Klepsiella pneumoniae and Pseudomonas aeruginosa). The results indicate that the tested metal oxides nanoparticles have an effect that varies depending on bacterial species. Indeed, Gram-positive bacteria show greater sensitivity to ZnO nanoparticles whereas Gram-negative bacteria are more sensitive to CuO nanoparticles.

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Cuevas, R., N. Durán, M. C. Diez, G. R. Tortella e O. Rubilar. "Extracellular Biosynthesis of Copper and Copper Oxide Nanoparticles byStereum hirsutum, a Native White-Rot Fungus from Chilean Forests". Journal of Nanomaterials 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/789089.

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The white-rot fungusStereum hirsutumwas studied to evaluate its applicability for use in the biosynthesis of copper/copper oxide nanoparticles under different pH conditions and in the presence of three different copper salts (CuCl2, CuSO4, and Cu(NO3)2). The nanoparticle formation was evaluated by UV-visible spectroscopy, electron microscopy (TEM), X-ray diffraction analysis (XRD), and Fourier transforms infrared spectroscopy (FTIR). The nanoparticles biosynthesis in presence of all copper salts demonstrated higher formation with 5 mM CuCl2under alkaline conditions. TEM analysis confirmed that the nanoparticles were mainly spherical (5 to 20 nm). The presence of amine groups attached to nanoparticles was confirmed by FTIR, which suggests that extracellular protein of fungus is responsible for the formation of the nanoparticles. Therefore, the white-rot fungusS. hirsutumwas found to exhibit potential for use in the synthesis of copper/copper oxide nanoparticles.

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Podlesnov, E., M. G. Nigamatdianov, A. O. Safronova e M. V. Dorogov. "Lithium Polymer Battery with PVDF-based Electrolyte Doped with Copper Oxide Nanoparticles: Manufacturing Technology and Properties". Reviews on advanced materials and technologies 3, n. 3 (2021): 27–31. http://dx.doi.org/10.17586/2687-0568-2021-3-3-27-31.

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An overview of electrolyte materials for lithium polymer batteries and the prospects for adding metal oxide nanoparticles to the electrolyte are presented in this paper. A procedure for the synthesis of a gel polymer electrolyte based on polyvinylidene fluoride doped with copper oxide nanoparticles is also described, and the ionic conductivity is measured by the electrochemical impedance spectroscopy. Cells with the synthesized electrolyte and LiFePO4 electrode have been assembled and cycled at different currents. Stable cycling and high capacity have been exhibited by the cell with electrolyte doped with copper oxide nanoparticle (wt. 0.1%).

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Jayakrishnan, Priyanga, Sirajunnisa Abdul Razack, Keerthana Sivanesan, Pavithra Sellaperumal, Geethalakshmi Ramakrishnan, Sangeetha Subramanian e Renganathan Sahadevan. "A facile approach towards copper oxide nanoparticles synthesis using Spirulina platensis and assessment of its biological activities". Brazilian Journal of Biological Sciences 5, n. 10 (2018): 433–42. http://dx.doi.org/10.21472/bjbs.051020.

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There is a budding need to develop a method for environmentally benign metal nanoparticle synthesis, that do not use toxic chemicals in the synthesis protocols to avoid adverse effects in medical applications. The present investigation dealt with the synthesis of copper oxide (CuO) nanoparticles from blue green alga, Spirulina platensis. The algal extract consisting of phytochemicals was used as the reducing agent and copper sulphate as the substrate. Synthesised nanoparticles were characterized by UV-Vis spectrophotometry, FT-IR spectroscopy, XRD and SEM. Antibacterial and anticancer activities were assessed for the CuO nanoparticles. The results indicated that the formed CuO nanoparticles were observed to be nanosheets. FT-IR spectral analysis elucidated the occurrence of biomolecules required for the reduction of copper oxide ions. The synthesized nanoparticles were found to be effective at the concentration of 1 mg/mL against Escherichia coli, Bacillus subtilis, Pseudomonas aeruginosa and Serratia marcescens. The cytotoxicity activity of CuO nanoparticle was evaluated by MTT Assay against colon cancer cell lines and confirmed that CuO nanoparticle at a concentration of 125 µg/mL had cytotoxic activity. In conclusion, the CuO nanoparticles were synthesized at a low energy supply, in an ecologically safe mode which could be utilized for pharmacological applications and various biotechnological studies.

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Daigle, Jean-Christophe, e Jerome P. Claverie. "A Simple Method for Forming Hybrid Core-Shell Nanoparticles Suspended in Water". Journal of Nanomaterials 2008 (2008): 1–8. http://dx.doi.org/10.1155/2008/609184.

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Core-shell hybrid nanoparticles, where the core is an inorganic nanoparticle and the shell an organic polymer, are prepared by a two-step method. Inorganic nanoparticles are first dispersed in water using poly(acrylic acid) (PAA) prepared by reversible addition fragmentation chain transfer (RAFT) polymerization as dispersant. Then, the resulting dispersion is engaged in a radical emulsion polymerization process whereby a hydrophobic organic monomer (styrene and butyl acrylate) is polymerized to form the shell of the hybrid nanoparticle. This method is extremely versatile, allowing the preparation of a variety of nanocomposites with metal oxides (alumina, rutile, anatase, barium titanate, zirconia, copper oxide), metals (Mo, Zn), and even inorganic nitrides (Si3N4).

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Sadabadi, Hamed, Adeleh Aftabtalab, Shirzad Zafarian, Shilpa Chakra, K. Venkateswara Rao e Sarah Shaker. "Influence of Fuel and Condition in Combustion Synthesis on Properties of Copper (II) Oxide Nanoparticle". Advanced Materials Research 829 (novembre 2013): 152–56. http://dx.doi.org/10.4028/www.scientific.net/amr.829.152.

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Copper oxide nanoparticles have been received attraction due to their unique properties and potential future applications. In present work nanostructure Copper (II) oxide (CuO) spherical nanoparticle synthesized by solution combustion method and the influence of different fuel and condition on the properties of CuO particle was investigated. Crystalline phase and size indicated by applying XRD and particle size distribution studied further using DLS. Scanning electron microscopy (SEM) was used for morphological study and EDAX analysis shows composition of CuO particles. Nanostructure of copper (II) oxide particle studied further by Transmission electron microscopy (TEM) and selected area electron diffraction (SAED) applied for detail study on crystalline structure of particles.

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Jaber, Shaimaa Hamed. "Comparing study of CuO synthesized by biological and electrochemical methods for biological activity". Al-Mustansiriyah Journal of Science 30, n. 1 (15 agosto 2019): 94. http://dx.doi.org/10.23851/mjs.v30i1.389.

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In the present work, copper oxide (CuO) nanoparticles have been synthesized by two methods (electro chemical and biological method).The synthesized nanoparticles characterized by x-ray diffraction (XRD), Scanning Electron Microscopy(SEM) and transmission Electron Microscopy(TEM). results show that to copper oxide (CuO) nanoparticle have average size of (11-15)nm of electrochemical method and (6-12 ) nm of biological method by different technique CuO nanoparticles were applied to study the inhibition of bacterial using (staphylococcus and pseudomonas). The antibacterial activity of CuO nanoparticles show a higher inhibition of pseudomonas bacteria when a compared with staphylococcus bacteria.

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Freidoonimehr, Navid, Behnam Rostami e Mohammad Mehdi Rashidi. "Predictor homotopy analysis method for nanofluid flow through expanding or contracting gaps with permeable walls". International Journal of Biomathematics 08, n. 04 (22 giugno 2015): 1550050. http://dx.doi.org/10.1142/s1793524515500503.

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In this paper a definitely new analytical technique, predictor homotopy analysis method (PHAM), is employed to solve the problem of two-dimensional nanofluid flow through expanding or contracting gaps with permeable walls. Moreover, comparison of the PHAM results with numerical results obtained by the shooting method coupled with a Runge–Kutta integration method as well as previously published study results demonstrates high accuracy for this technique. The fluid in the channel is water containing different nanoparticles: silver, copper, copper oxide, titanium oxide, and aluminum oxide. The effects of the nanoparticle volume fraction, Reynolds number, wall expansion ratio, and different types of nanoparticles on the flow are discussed.

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Rajeshkumar, S., Soumya Menon, Venkat Kumar S, M. Ponnanikajamideen, Daoud Ali e Kalirajan Arunachalam. "Anti-inflammatory and Antimicrobial Potential of Cissus quadrangularis-Assisted Copper Oxide Nanoparticles". Journal of Nanomaterials 2021 (27 dicembre 2021): 1–11. http://dx.doi.org/10.1155/2021/5742981.

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Recently, nontoxic origin-mediated synthesis of copper oxide nanoparticles acquires further recognition because of the key role of bioapplications. The plant Cissus quadrangularis is one most prominent herbs used in the treatment of diabetes, asthma, tissue regeneration, etc. In this study, we tested the process of copper oxide nanoparticle synthesis and their role in many functions from Cissus quadrangularis. The synthesis of copper oxide nanoparticles uses plant extract and characterization by X-ray diffraction, thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FT-IR), atomic force microscope (AFM), and scanning electron microscope (SEM). The synthesized nanoparticles were analyzed for their biomedical applications such as antibacterial, antifungal, antioxidant, antidiabetic, and anti-inflammatory activity and antiproteinase action. The results show that the C. quadrangularis plant-mediated nanoparticles may be used in many biomedical applications related to arthritis, diabetes, and the production of various antimicrobial products in the future.

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Dutta, Biplab, Epsita Kar, Navonil Bose e Sampad Mukherjee. "Significant enhancement of the electroactive β-phase of PVDF by incorporating hydrothermally synthesized copper oxide nanoparticles". RSC Advances 5, n. 127 (2015): 105422–34. http://dx.doi.org/10.1039/c5ra21903e.

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The influence of copper oxide nanoparticles on the polymorphism of PVDF is systematically investigated. Strong interfacial interactions between the negative nanoparticle surface and positive –CH₂ dipoles of PVDF enhance the electroactive β-phase.

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Gu, Wei Bing, e Zheng Cui. "Intense Pulsed Light Sintering of Copper Nanoink for Conductive Copper Film". Applied Mechanics and Materials 748 (aprile 2015): 187–92. http://dx.doi.org/10.4028/www.scientific.net/amm.748.187.

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Conducting electrodes and films are becoming increasingly important for the printed electronics which can be applied in various fields such as RFID tags, photovoltaics, display and PCB. And copper nanoparticle inks serve as an attractive potential replacement to silver nanoparticle inks because its low cost and good electrical conductivtiy.In this paper, the commercial copper nanoparticle powder with oxide shells were dispersed in the solvent of ethylene glycol. Poly (N-vinylpyrrolidone) (PVP K30) was added to the solvent as capping materials. The prepared copper ink was spin-coated on glass substrate under ambient conduction. Then, the deposited Cu ink was sintered by an intense pulsed light (IPL) system. The sintering effects were investigated with different sintering conditions including pulse energy and pulse duration. The resulting electrical resistivity was 94.1uΩ·cm which is about fifty times as high as that of bulk copper. The high resistivity may be mainly attributed to the porosity of sintered film. Also, crystal phase analysis was performed using x-ray diffraction (XRD) and was found the XRD peaks corresponding to cuprous oxide disappeared after IPL sintering. It was believed that PVP reduced the copper oxide to copper in the process of IPL sintering.

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Ghareeb, Ozdan Akram, e Samed Abduljabbar Ramadhan. "Prophylactic Efficacy of Silymarin upon Renal Dysfunction Induced by Copper Oxide Nanoparticle". Journal Healthcare Treatment Development, n. 36 (23 settembre 2023): 29–38. http://dx.doi.org/10.55529/jhtd.36.29.38.

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Copper oxide nanoparticles (CuO-NPs) have unique properties encouraged their rapidly growing uses in various fields as biomedical applications and environmental remediation. In this regard, the potential toxicity resulting from repeated exposure increases exponentially, so ensuring the suitability and safety of these nanoparticles for different uses is urgent. This experimental study aims to estimate nephrotoxic effects of CuO-NPs on some renal dysfunction markers along with the possibility attenuated efficacy of silymarin (SLM) in laboratory animals. Twenty four adult male rats were recruited in current study distributed into (4) equal groups. In CON group rats were given distilled water only and considered as control, while rats in CuO-NPs group were poisoned with copper oxide nanoparticles using gastric gavage. In CuO-NPs + SLM group, rats were provided with both CuO-NPs plus silymarin orally. In the SLM group, only silymarin was administered to rats. Studied rats were sacrificed and sera and kidney homogenates were obtained to complete the necessary biochemical and oxidative stress tests. According to the results, rats intoxicated with CuO-NPs recorded deleterious alterations in all studied renal biomarkers levels compared to control rats. However, the data confirmed that the coadministration of SLM with CuO-NPs had positively ameliorated the detrimental changes induced by CuO-NPs. In conclusion, it was suggested that a high dose of copper oxide NPs may cause significant impairment in renal functioning, and silymarin can be considered as a protective agent upon potential nephrotoxicity induced by copper oxide nanoparticle.

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Jadidian, Reza, Hooshang Parham, Sara Haghtalab e Razieh Asrarian. "Removal of Copper from Industrial Water and Wastewater Using Magnetic Iron Oxide Nanoparticles Modified with Benzotriazole". Advanced Materials Research 829 (novembre 2013): 742–46. http://dx.doi.org/10.4028/www.scientific.net/amr.829.742.

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This paper shows effective removal of copper from water and industrial wastewater by modified magnetic nanoparticle with benzotriazole as an efficient adsorbent. The method is fast, simple, cheap, effective and safe for treatment of copper polluted waters. Non-modified magnetic iron oxide nanoparticles (MIONPs) can adsorb up to 49.6% of 50 ng ml-1 of Cu (ΙΙ) ions from polluted water, but modified magnetic nanoparticles improved the efficiency up to 99.7% for same concentration. The required time for complete removal of copper ions was 5 minutes. Variation of pH and high electrolyte concentration (NaCl) of the solution do not have considerable effect on the copper removal efficiency.

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Rajapaksha, Piumie, Samuel Cheeseman, Stuart Hombsch, Billy James Murdoch, Sheeana Gangadoo, Ewan W. Blanch, Yen Truong et al. "Antibacterial Properties of Graphene Oxide–Copper Oxide Nanoparticle Nanocomposites". ACS Applied Bio Materials 2, n. 12 (18 novembre 2019): 5687–96. http://dx.doi.org/10.1021/acsabm.9b00754.

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25

Subashini, K., S. Prakash e V. Sujatha. "Anticancer Activity of Copper Oxide Nanoparticles Synthesized from Brassia actinophylla Flower Extract". Asian Journal of Chemistry 31, n. 9 (31 luglio 2019): 1899–904. http://dx.doi.org/10.14233/ajchem.2019.22035.

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Abstract (sommario):

There are many methods to synthesize metal and metal oxide nanoparticles. In this paper, copper oxide nanoparticles have been synthesized by solution combustion method using Brassia actinophylla i.e. Schefflera actinophylla flower extract belongs to Araliaceae family. The importance of solution combustion is one of the easy and simplest methods for the synthesis of metal oxide nanoparticle. The CuO nanoparticles were synthesized at various temperatures and the characterization has been carried out by UV, FTIR, PXRD, SEM, TEM and EDAX analysis. At lower temperature, the peak was not observed but at 400 ºC, the UV peak was observed at 340 nm. The FTIR peaks observed at 1000-500 cm-1 confirms again the presence of CuO nanoparticles. The monoclinic phase and crystalline structure of nanoparticles were revealed by PXRD pattern, by Scherrer′s method the average crystalline sizes were found to be in the range of 15 to 24 nm. The size and the shape of nanoparticles were confirmed by SEM and TEM reports. The SEM images of nanoparticles show spherical in shape and free from agglomeration. TEM analysis reports the nanoparticle sizes ranging from 2 to 20 nm. The percentage of copper (52 %) and oxygen (26 %) elements were recorded in the EDAX analysis. The study of size and stability of nanoparticles were done by zeta potential values. The antibacterial activity of CuO nanoparticles were carried out against Staphylococcus aureus and Escherichia coli bacteria's by agar well diffusion method. The MTT assay was performed in order to check the anticancer activity of CuO nanoparticles against HT-29 colon cancer cells.

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Sowbakkiyalakshmi B. e Kolanjinathan K. "Myconanosynthesis of Copper Oxide Nanoparticles from Talaromyces versatilis against Human Bacterial Pathogens". UTTAR PRADESH JOURNAL OF ZOOLOGY 44, n. 21 (12 ottobre 2023): 274–81. http://dx.doi.org/10.56557/upjoz/2023/v44i213699.

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Globally, there is a clinical problem caused by rising antibiotic resistance. The latest advances in biosynthesis have intrigued scientists and researchers as they investigate its potential against dangerous bacteria. The current emphasis is on myconanosynthesis, copper oxide nanoparticle (CuO NPs) characterization, and antibacterial efficacy. The extracellular biosynthetic approach we employed to create the CuO NPs was friendly to the environment. From agricultural soil samples, Talaromyces versatilis was isolated. They were comparing its 18s rDNA sequencing allowed for identification. Culture filtrate extracts of fungi were used as the reducing agents to synthesis the nanoparticles. XRD and DLS analysis were used to determine copper oxide nanoparticles (CuO NPs) size and material characteristics. When tested against Gram-positive and Gram-negative bacteria from that Salmonella paratyphi, Serratia sp., and Enterococcus fecalis myconanosynthesized copper oxide nanoparticles (CuO NPs) demonstrated a maximal zone of inhibition. Additionally, molecular in vivo research will aid in the creation of a novel wide-spectrum antibacterial drug.

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Chang, Ho, Chih Hung Lo, Tsing Tshih Tsung, Y. Y. Cho, D. C. Tien, Liang Chia Chen e C. H. Thai. "Temperature Effect on the Stability of CuO Nanofluids Based on Measured Particle Distribution". Key Engineering Materials 295-296 (ottobre 2005): 51–56. http://dx.doi.org/10.4028/www.scientific.net/kem.295-296.51.

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This study aims to investigate the temperature effect on particle size of copper oxide nanofluid produced under optimal parameters of the Arc Spray Nanoparticle Synthesis System (ASNSS) developed in this research. The purpose is to understand the aggregation feature of copper oxide nanofluid in a higher-than-room-temperature environment and to analyze its size change and the motion behavior of suspended nanoparticles. This study employs an ambient temperature controller to maintain the environment temperature within the scope of normal fluid work temperature to obtain data on the change in suspended particles of copper oxide nanofluid under varying temperatures and through change of time. Experimental result shows that the particle size distribution of copper oxide nanofluid changes when the temperature rises due to the slight absorption and aggregation phenomena between particles, and that the change in environmental temperature can accelerate the aggregation of copper oxide nanofluid, which can affect its stability in application. However, the change in particle size distribution will gradually stabilize for a longer duration of constant temperature.

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Sreekala, G., Beevi A. Fathima e B. Beena. "Adsorption of Lead (Ii) Ions by Ecofriendly Copper Oxide Nanoparticles". Oriental Journal of Chemistry 35, n. 6 (21 novembre 2019): 1731–36. http://dx.doi.org/10.13005/ojc/350615.

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The present investigation is on the application of green synthesized CuO nanoparticles for elimination of lead (II) from waste water. Nano CuO was prepared from aqueous copper acetate solution and aqueous leaf extract of Simarouba glauca plant. The prepared nano CuO was characterized by XRD, FT-IR, UV, SEM and TEM. The nano CuO synthesized by this method was spherical in shape with particle size nearly 20 nm. The adsorption of lead (II) ions on nano CuO under various parameters such as amount of catalyst, concentration of metal ion and pH were studied using batch adsorption experiments. Experimental results indicate that the green synthesized CuO nanoparticle is a very good adsorbent for the efficient removal of Lead (II) from waste water. Optimum conditions for 95% adsorption of Pb2+ on CuO nanoparticle are pH 6, amount of catalyst 0.05g and concentration of metal ion 10mgL-1.

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Freidoonimehr, Navid, Behnam Rostami, Mohammad Mehdi Rashidi e Ebrahim Momoniat. "Analytical Modelling of Three-Dimensional Squeezing Nanofluid Flow in a Rotating Channel on a Lower Stretching Porous Wall". Mathematical Problems in Engineering 2014 (2014): 1–14. http://dx.doi.org/10.1155/2014/692728.

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Abstract (sommario):

A coupled system of nonlinear ordinary differential equations that models the three-dimensional flow of a nanofluid in a rotating channel on a lower permeable stretching porous wall is derived. The mathematical equations are derived from the Navier-Stokes equations where the governing equations are normalized by suitable similarity transformations. The fluid in the rotating channel is water that contains different nanoparticles: silver, copper, copper oxide, titanium oxide, and aluminum oxide. The differential transform method (DTM) is employed to solve the coupled system of nonlinear ordinary differential equations. The effects of the following physical parameters on the flow are investigated: characteristic parameter of the flow, rotation parameter, the magnetic parameter, nanoparticle volume fraction, the suction parameter, and different types of nanoparticles. Results are illustrated graphically and discussed in detail.

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Palanisamy, Karumalaiyan, Velayutham Gurunathan e Jothilingam Sivapriya. "Ultrasonic Assisted Facile Synthesis of CuO Nanoparticles and Used as Insecticide for Mosquito Control". Asian Journal of Chemistry 35, n. 4 (2023): 986–90. http://dx.doi.org/10.14233/ajchem.2023.23962.

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The present study deals with the fabrication of copper oxide nanoparticles with high purity via ultrasonic assisted chemical precipitation method. Synthesized CuO nano-mosquitocides rely on the polyvinyl pyrrolidine (PVP) as stabilizing agent. Synthesized CuO nanoparticles were confirmed via UV-vis spectroscopy, scanning electron microscope, X-ray diffraction, EDX, Fourier-transform infrared and SEM mapping studies. The crystallite size from XRD studies revealed around 13.44 nm. The synthesized CuO nanoparticle was further assessed for mosquito larvicidal activity against south-urban mosquito larvae Aedes aegypti. The synthesized CuO nanoparticle displayed significant activity against Aedes aegypti with the LD50 value of 43.95 μg/mL than precursor copper chloride dihydrate and control permethrin with the LD50 value of 94.31 and 72.44 μg/mL.

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Kao, Mu Jung, Chih Hung Lo, Tsing Tshih Tsung e Hong Ming Lin. "Development of Pressure Technique of Brake Nanofluids from an Arc Spray Nanoparticles Synthesis System". Materials Science Forum 505-507 (gennaio 2006): 49–54. http://dx.doi.org/10.4028/www.scientific.net/msf.505-507.49.

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The low-pressure control methods for an arc-submerged nanoparicle synthesis system (ASNSS) was proposed and developed for brake nanofluids. In the process, a copper bar is melted and vaporized in insulating liquid for core formation with crystallization suppressed to derive nanofluid that contains nanometer copper particles in DOT3 brake fluid. Two technical advances associated with nanoparticle synthesis were achieved. One is the novel pressure control technique developed for nanoparticle fabrication. The other is the verification that the constant low-operating pressure. Pressure operating plays important role in determining the characteristics of the prepared nanoparticles in brake fluids. From the experimental processes, pressure control of the ASNSS was identified as crucial to success of nanoparticles synthesis. To achieve the desired pressure control, a vacuum chamber was developed as a nanoparticle accumulator and low-pressure reservoir. The chamber was controlled by the proposed flow –valve feedback control system and integrated with the ASNSS. The pressure control equipment of the ASNSS was effectively developed to prepare desired copper-oxide brake nanofluids with well-controlled size.

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Journal, Baghdad Science. "Fabricated of Cu Doped ZnO Nanoparticles for Solar Cell Application". Baghdad Science Journal 15, n. 2 (4 giugno 2018): 198–204. http://dx.doi.org/10.21123/bsj.15.2.198-204.

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Copper with different concentrations doped with zinc oxide nanoparticles were prepared from a mixture of zinc acetate and copper acetate with sodium hydroxide in aqueous solution. The structure of the prepared samples was done by X-ray diffraction, atomic force microscopy (AFM) and UV-VIS absorption spectrophotometer. Debye-Scherer formula was used to calculate the size of the prepared samples. The band gap of the nanoparticle ZnO was determined by using UV-VIS optical spectroscopy.

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Medvedeva, Xenia, Aleksandra Vidyakina, Feng Li, Andrey Mereshchenko e Anna Klinkova. "Reductive and Coordinative Effects of Hydrazine in Structural Transformations of Copper Hydroxide Nanoparticles". Nanomaterials 9, n. 10 (11 ottobre 2019): 1445. http://dx.doi.org/10.3390/nano9101445.

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Shape-specific copper oxide nanostructures have attracted increasing attention due to their widespread applications in energy conversion, sensing, and catalysis. Advancing our understanding of structure, composition, and surface chemistry transformations in shaped copper oxide nanomaterials during changes in copper oxidation state is instrumental from both applications and preparative nanochemistry standpoints. Here, we report the study of structural and compositional evolution of amorphous copper (II) hydroxide nanoparticles under hydrazine reduction conditions that resulted in the formation of crystalline Cu2O and composite Cu2O-N2H4 branched particles. The structure of the latter was influenced by the solvent medium. We showed that hydrazine, while being a common reducing agent in nanochemistry, can not only reduce the metal ions but also coordinate to them as a bidentate ligand and thereby integrate within the lattice of a particle. In addition to shape and composition transformation of individual particles, concurrent interparticle attachment and ensemble shape evolution were induced by depleting surface stabilization of individual nanoparticles. Not only does this study provide a facile synthetic method for several copper (I) oxide structures, it also demonstrates the complex behavior of a reducing agent with multidentate coordinating ability in nanoparticle synthesis.

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Msebawi, Muntadher Sabah, Zulkiflle Leman, Shazarel Shamsudin, Suraya Mohd Tahir, Che Nor Aiza Jaafar, Azmah Hanim Mohamed Ariff, Nur Ismarrubie Zahari e Mohammed H. Rady. "The Effects of CuO and SiO2 on Aluminum AA6061 Hybrid Nanocomposite as Reinforcements: A Concise Review". Coatings 11, n. 8 (15 agosto 2021): 972. http://dx.doi.org/10.3390/coatings11080972.

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Hybrid composites are obtained by embedding multiple micro and nano reinforcements into the matrix materials. These hybrid composites are helpful to obtain the useful properties of matrix and reinforcement materials. Aluminum matrix is one the most common matrix materials due to its excellent thermal and electrical properties. This review covers various aspects of nanoparticle-reinforced Al hybrid composites. Solid-state recycling of Al only consumes around 5% of the energy utilized in the conventional extraction and recycling methods. This review revolves around the induction of silica and copper oxide nanoparticles into the solid-state recycled Al matrix material to form the hybrid composite. These nanoparticles enhance stiffness, toughness, and high temperature stability for Al hybrid composites. A detailed analysis was carried out for AA6061-grade Al matrix materials along with the silica and copper oxide nanoparticles. The present work focused on the effects of nano silica and nano copper oxide particle reinforcements on Al-based composite manufactured via hot extrusion process. The composite fabrication through solid-state recycling is discussed in detail. A detailed analysis for the effects of volume fraction and wt.% of CuO and SiO2 reinforcement particles was carried out by various characterization techniques. A detailed comparison in terms of mechanical performance of Al-based composites with the addition of nano silica and nano copper oxide particles is presented here to investigate the efficiency and performance of these particles.

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Hackett, Cannon, Mojtaba Abolhassani, Lauren F. Greenlee e Audie K. Thompson. "Ultrafiltration Membranes Functionalized with Copper Oxide and Zwitterions for Fouling Resistance". Membranes 12, n. 5 (23 maggio 2022): 544. http://dx.doi.org/10.3390/membranes12050544.

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Abstract (sommario):

Polymeric membrane fouling is a long-standing challenge for water filtration. Metal/metal oxide nanoparticle functionalization of the membrane surface can impart anti-fouling properties through the reactivity of the metal species and the generation of radical species. Copper oxide nanoparticles (CuO NPs) are effective at reducing organic fouling when used in conjunction with hydrogen peroxide, but leaching of copper ions from the membrane has been observed, which can hinder the longevity of the CuO NP activity at the membrane surface. Zwitterions can reduce organic fouling and stabilize NP attachment, suggesting a potential opportunity to combine the two functionalizations. Here, we coated polyethersulfone (PES) ultrafiltration membranes with polydopamine (PDA) and attached the zwitterionic compound, thiolated 2-methacryloyloxyethyl phosphorylcholine (MPC-SH), and CuO NPs. Functionalized membranes resulted in a higher flux recovery ratio (0.694) than the unfunctionalized PES control (0.599). Copper retention was high (>96%) for functionalized membranes. The results indicate that CuO NPs and MPC-SH can reduce organic fouling with only limited copper leaching.

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Parimala, Lakshmikanthan, e J. Santhanalakshmi. "Oxidative Degradation of Rhodamine B Catalysed by Copper Oxide Nanoparticles in Aqueous Medium". Advanced Materials Research 584 (ottobre 2012): 267–71. http://dx.doi.org/10.4028/www.scientific.net/amr.584.267.

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In the present work , copper oxide nanoparticles are synthesized by wet sol – gel method using sodium hydroxide as the precipitating agent and starch as the capping agent. Size characterization of the nanoparticle was done by TEM, XRD and FT – IR. The as prepared nanoparticles are used as catalyst in the degradation Rhodamine B dye using hydrogen peroxide.The effects of H2O2 dosage, medium pH, solution temperature, and the dye compositions on the degradation kinetics of rhodamine B have been studied. The pH=4 and temperature = 40◦c are the optimized conditions.

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Wang, Qing, e Manel del Valle. "Sensors for the Determination of Organic Load (Chemical Oxygen Demand) Utilizing Copper/Copper Oxide Nanoparticle Electrodes". Proceedings 42, n. 1 (14 novembre 2019): 63. http://dx.doi.org/10.3390/ecsa-6-06564.

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Chemical oxygen demand (COD) is a widely used parameter in analyzing and controlling the degree of pollution in water. Methods of analysis based on electrochemical sensors are increasingly being used for COD quantitation because they could be simple, accurate, sensitive and environmentally friendly. Electro-oxidizing the organic contaminants to completely transform them into CO2 and H2O is considered the best method for COD estimation using sensors. In this sense, copper electrodes have been reported based on the fact that copper in alkaline media acts as a powerful electrocatalyst for oxidation of aminoacids and carbohydrates, which are believed to be the major culprits of organic pollution. In this work, three kinds of copper/copper oxide electrodes were studied that employed the cyclic voltammetry technique: electrodeposited copper nanoparticle electrode, copper nanoparticle–graphite composite electrode and copper oxide nanoparticle–graphite composite electrode. Actual COD estimations are based on the measurements of oxidation currents of organic compounds. Glucose, potassium hydrogen phthalate and ethylene glycol were chosen to be the standard substances to observe the responses, and to correlate the current intensity vs. the COD values. The performed calibrations showed that glucose and ethylene glycol can be oxidized by these three electrodes, as the current intensity increased along with increasing concentrations. However, only the electrodeposited copper nanoparticle electrode showed the ability to oxidize potassium hydrogen phthalate. Besides, the obtained voltammetric profiles presented different shapes with the tested organic compounds, suggesting this can be used as a potential fingerprint for distinguishing the organic compounds. Ongoing work is focused on optimizing measuring conditions and detecting the COD values of real samples.

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Salim, E., S. R. Bobbara, A. Oraby e J. M. Nunzi. "Copper oxide nanoparticle doped bulk-heterojunction photovoltaic devices". Synthetic Metals 252 (giugno 2019): 21–28. http://dx.doi.org/10.1016/j.synthmet.2019.04.006.

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Semboshi, Satoshi, Yasuhiro Sakamoto, Hiroyuki Inoue, Akihiro Iwase e Naoya Masahashi. "Electroforming of oxide-nanoparticle-reinforced copper-matrix composite". Journal of Materials Research 30, n. 4 (3 febbraio 2015): 521–27. http://dx.doi.org/10.1557/jmr.2014.401.

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40

Parasuraman, Loganathan, Nirmal Peddisetty e Ganesan Periyannagounder. "Radiation effects on an unsteady MHD natural convective flow of a nanofluid past a vertical plate". Thermal Science 19, n. 3 (2015): 1037–50. http://dx.doi.org/10.2298/tsci121208155p.

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Numerical analysis is carried out on an unsteady MHD natural convective boundary layer flow of a nanofluid past an isothermal vertical plate in the presence of thermal radiation. The governing partial differential equations are solved numerically by an efficient, iterative, tri-diagonal, semi-implicit finite-difference method. In particular, we investigate the effects of radiation, magnetic field and nanoparticle volume fraction on the flow and heat transfer characteristics. The nanofluids containing nanoparticles of aluminium oxide, copper, titanium oxide and silver with nanoparticle volume fraction range less than or equal to 0.04 are considered. The numerical results indicate that in the presence of radiation and magnetic field, an increase in the nanoparticle volume fraction will decrease the velocity boundary layer thickness while increasing the thickness of the thermal boundary layer. Meanwhile, an increase in the magnetic field or nanoparticle volume fraction decreases the average skin-friction at the plate. Excellent validation of the present results has been achieved with the published results in the literature in the absence of the nanoparticle volume fraction.

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Yousif, Alyaa Muhsin. "Physiological Effects of Nanoparticles Prepared from Olive Leaf Extract and Copper Oxide on Strawberry Plants". South Asian Research Journal of Agriculture and Fisheries 5, n. 04 (19 luglio 2023): 28–35. http://dx.doi.org/10.36346/sarjaf.2023.v05i04.001.

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Abstract (sommario):

Background: Nanoparticles, due to their small size and large surface area, have unique physicochemical properties that make them attractive for a wide range of industrial, medical, agricultural application. Objective: To prepare a novel nanoparticles from olive leaf extract and copper oxide and test its physiological effect of strawberry plants. Materials and Methods: Olive leaves extract was prepared according to a certain protocol, and the green nanoparticles were synthesized by coordination this extract with copper oxide. Characterization was done using many techniques such as FTIR, UV-Vis, XRD to identify the new copper nanoparticles. Different concentrations were prepared of CuONPs (10%, 20%, and 30%). Results: The FTIR spectrum shows peaks which confirm the coordination of olive leaves extract with the copper ion, while UV-Vis spectrum shows peaksthat confirm the formation of copper nanoparticles, the SEM shows the homogeneity of the nanoparticle that was confirmed by XRD spectrum and dataUsing30% (C3) give best seedling leaf length, and number of fruitswhile number of leaves are best in 20% (C2) compared to other concentrations. While the highest value in the number of flowers in treatmentof bio fertilizer. Best concentration of DNA appears in C3 (134.7) while best DNA purity is found on C2 (20%). The chlorophyll was also measured using SPADwhich show optimum with C3 (30%). Conclusions: Using30% (C3) give best seedling leaf length, number of fruits and chlorophyll while number of leaves are best in 20% (C2).

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Liu, Shao Hui, Yu Zhao e Xu Ran. "Microstructure and Properties of Co@RGO/Cu Composites by One-Step In Situ Reduction Method". Materials Science Forum 993 (maggio 2020): 646–53. http://dx.doi.org/10.4028/www.scientific.net/msf.993.646.

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In order to improve the interfacial bonding between graphene and copper and improve the dispersibility of graphene in the copper matrix, a novel method was used to prepare graphene. Firstly, graphene oxide (GO) was prepared by the modified Hummer's method, and then the reduced graphene oxide-supported cobalt nanoparticle composite powder (Co@RGO) was prepared by one-step in-situ reduction method. The fabricated materials were mixed with copper powder to obtain various volume fractions. The powder mixture was subjected to compression and discharge plasma sintering (SPS) to prepare a bulk copper-based composite material. The microstructure and its comprehensive properties were studied by SEM, TEM, XRD, FTIR and Raman. The results show that the agglomeration of graphene can be effectively inhibited after the cobalt nanoparticles supported on the graphene surface. The proper amount of Co@RGO could be uniformly dispersed in the copper matrix. The composite material showed a high electrical conductivity (>86% IACS), and the Vickers hardness also increased by about 30% compared with pure copper.

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Oh, Gyung-Hwan, Hyun-Jun Hwang e Hak-Sung Kim. "Effect of copper oxide shell thickness on flash light sintering of copper nanoparticle ink". RSC Advances 7, n. 29 (2017): 17724–31. http://dx.doi.org/10.1039/c7ra01429e.

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Arvand, Majid, Masoomeh Sayyar Ardaki e Mohammad Ali Zanjanchi. "A new sensing platform based on electrospun copper oxide/ionic liquid nanocomposite for selective determination of risperidone". RSC Advances 5, n. 51 (2015): 40578–87. http://dx.doi.org/10.1039/c5ra02554k.

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Lotfi, Mohamed, Rodolphe Heyd, Abderrahim Bakak, Abdellah Hadaoui e Abdelaziz Koumina. "Experimental Measurements on the Thermal Conductivity of Glycerol-Based Nanofluids with Different Thermal Contrasts". Journal of Nanomaterials 2021 (6 settembre 2021): 1–9. http://dx.doi.org/10.1155/2021/3190877.

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We report, in this work, our study of the thermal conductivity of high-viscosity nanofluids based on glycerol. Three nanofluids have been prepared with different thermal contrasts, by suspending graphene flakes, copper oxides, or silica nanoparticles in pure glycerol. The nanofluids were thermally characterized at room temperature with the 3ω technique, with low amplitudes of the temperature oscillations. A significant enhancement of the thermal conductivity is found in both the glycerol/copper oxide and the glycerol/graphene flake nanofluids. Our results question the role played by the Brownian motion in the microscopic mechanisms of the thermal conductivity of high-viscosity glycerol-based nanofluids. A similar behavior of the thermal conductivity as a function of the nanoparticle volume fraction was found for all three glycerol-based nanofluids presently investigated. These results could be explained on the basis of fractal aggregation in the nanofluids.

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Zizzo, John. "Toxicity effects of Cubic Cu2O nanoparticles on defecation rate and length in C. Elegans". Biomedical Research and Therapy 7, n. 10 (31 ottobre 2020): 4045–51. http://dx.doi.org/10.15419/bmrat.v7i10.639.

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Introduction: The increased presence of radiation and toxins in the atmosphere has given rise to fuel cells and nanoparticle technology with the ability to catalyze reactions at favorable energy levels. The purpose of this experiment was to determine the lasting effects of a synthesized catalyst on a model organism, Caenorhabditis (C.) elegans. Methods: Copper sulfate was tested alongside copper(I) oxide (i.e. Cu2O) to dissociate the copper composition effects from those of the nanoparticles themselves. The prospect of testing both defecation rate and size differences allowed for C. elegans to be utilized due to their low maintenance costs, mapped neuronal pathways, and short-generation times. Results: The results indicated significant toxicity effects in wild-type worms as witnessed by the decreases in nematode defecation rate and length by copper sulfate, with similar results in SMF-1 and PCS-1 mutants by Cu2O catalysts in cubic synthesized form. Conclusion: These outcomes reinforce the known effects of metal oxides on pollutants and highlight the need for further testing with additional variables such as varying pH and temperature.

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Sutunkova, Marina Petrovna, Larisa Ivanovna Privalova, Yuliya Vladimirovna Ryabova, Ilzira Amirovna Minigalieva, Anastasiya Valeryevna Tazhigulova, Alla Konstantinovna Labzova, Svetlana Vladislavovna Klinova et al. "Comparative assessment of the pulmonary effect in rats to a single intratracheal administration of selenium or copper oxide nanoparticles". Toxicological Review 29, n. 6 (30 dicembre 2021): 39–46. http://dx.doi.org/10.36946/0869-7922-2021-29-6-39-46.

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Introduction. Professional contact with selenium, copper and their compounds, including nanoscale forms, occurs in the metallurgical processes of copper sludge processing, copper pyrite roasting, manganese, selenium and tellurium production. The wide prevalence of selenium and copper oxide nanoparticles (SeO and CuO NPs) necessitates a comparative experimental assessment of its toxicity. Materials and methods. The copper or selenium oxide nanoparticle suspensions or a deionized water were intratracheally administered to female rats at single time. The bronchoalveolar lavage fluid (BALF) was obtained 24 hours after administration. There were evaluated the cellular composition and the biochemical parameters of the BALF. Results. The changes in the cellular composition of BALF demonstrate the SeO-NP and CuO-NP have a cytotoxic effect. The BALF biochemical indices were changed to a greater extent under CuO-NP. However, the phagocytic capacity of alveolar macrophages is activated under the SeO-NP. Conclusion. The SeO-NP and CuO-NP have a cytotoxic effect. SeO-NP have a positive effect on pulmonary phagocytosis, which can presumably be associated with selenium is a biomicroelement.

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Studer, Andreas M., Ludwig K. Limbach, Luu Van Duc, Frank Krumeich, Evagelos K. Athanassiou, Lukas C. Gerber, Holger Moch e Wendelin J. Stark. "Nanoparticle cytotoxicity depends on intracellular solubility: Comparison of stabilized copper metal and degradable copper oxide nanoparticles". Toxicology Letters 197, n. 3 (1 settembre 2010): 169–74. http://dx.doi.org/10.1016/j.toxlet.2010.05.012.

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Nasibulin, Albert G., P. Petri Ahonen, Olivier Richard e Esko I. Kauppinen. "Copper and copper oxide nanoparticle formation by chemical vapor nucleation from copper (II) acetylacetonate". Journal of Aerosol Science 31 (settembre 2000): 552–53. http://dx.doi.org/10.1016/s0021-8502(00)90563-9.

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Dukhinova, Marina S., Artur Y. Prilepskii, Alexander A. Shtil e Vladimir V. Vinogradov. "Metal Oxide Nanoparticles in Therapeutic Regulation of Macrophage Functions". Nanomaterials 9, n. 11 (16 novembre 2019): 1631. http://dx.doi.org/10.3390/nano9111631.

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Macrophages are components of the innate immune system that control a plethora of biological processes. Macrophages can be activated towards pro-inflammatory (M1) or anti-inflammatory (M2) phenotypes depending on the cue; however, polarization may be altered in bacterial and viral infections, cancer, or autoimmune diseases. Metal (zinc, iron, titanium, copper, etc.) oxide nanoparticles are widely used in therapeutic applications as drugs, nanocarriers, and diagnostic tools. Macrophages can recognize and engulf nanoparticles, while the influence of macrophage-nanoparticle interaction on cell polarization remains unclear. In this review, we summarize the molecular mechanisms that drive macrophage activation phenotypes and functions upon interaction with nanoparticles in an inflammatory microenvironment. The manifold effects of metal oxide nanoparticles on macrophages depend on the type of metal and the route of synthesis. While largely considered as drug transporters, metal oxide nanoparticles nevertheless have an immunotherapeutic potential, as they can evoke pro- or anti-inflammatory effects on macrophages and become essential for macrophage profiling in cancer, wound healing, infections, and autoimmunity.

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